Added basic ownership transfer for shared documents

Fix items/buffs/... refresh after casting a spell

.idea/inspectionProfiles/Project_Default.xml

@@ -1,13 +0,0 @@
-<component name="InspectionProjectProfileManager">
-  <profile version="1.0">
-    <option name="myName" value="Project Default" />
-    <inspection_tool class="HtmlUnknownAttribute" enabled="false" level="WARNING" enabled_by_default="false">
-      <option name="myValues">
-        <value>
-          <list size="0" />
-        </value>
-      </option>
-      <option name="myCustomValuesEnabled" value="true" />
-    </inspection_tool>
-  </profile>
-</component>

.idea/inspectionProfiles/profiles_settings.xml

@@ -1,7 +0,0 @@
-<component name="InspectionProjectProfileManager">
-  <settings>
-    <option name="PROJECT_PROFILE" value="Project Default" />
-    <option name="USE_PROJECT_PROFILE" value="true" />
-    <version value="1.0" />
-  </settings>
-</component>

.jscsrc

@@ -1,56 +0,0 @@
-{
-	"requireOperatorBeforeLineBreak": true,
-	"requireCamelCaseOrUpperCaseIdentifiers": true,
-	"maximumLineLength": {
-		"value": 80,
-		"allowComments": true,
-		"allowRegex": true
-	},
-	"validateIndentation": "\t",
-	"validateQuoteMarks": "\"",
-
-	"disallowMultipleLineStrings": true,
-	"disallowMixedSpacesAndTabs": "smart",
-	"disallowTrailingWhitespace": true,
-	"disallowSpaceAfterPrefixUnaryOperators": true,
-	"disallowMultipleVarDecl": false,
-	"disallowNewlineBeforeBlockStatements": true,
-	"disallowKeywordsOnNewLine": ["else"],
-
-	"requireSpaceAfterKeywords": [
-		"if",
-		"else",
-		"for",
-		"while",
-		"do",
-		"switch",
-		"return",
-		"try",
-		"catch"
-	],
-	"requireSpaceBeforeBinaryOperators": [
-		"=", "+=", "-=", "*=", "/=", "%=", "<<=", ">>=", ">>>=",
-		"&=", "|=", "^=", "+=",
-
-		"+", "-", "*", "/", "%", "<<", ">>", ">>>", "&",
-		"|", "^", "&&", "||", "===", "==", ">=",
-		"<=", "<", ">", "!=", "!=="
-	],
-	"requireSpaceAfterBinaryOperators": true,
-	"requireSpacesInConditionalExpression": true,
-	"requireSpacesInForStatement": true,
-	"requireTrailingComma": {
-		"ignoreSingleValue": true,
-		"ignoreSingleLine": true
-	},
-	"requireLineFeedAtFileEnd": true,
-	"disallowSpacesInAnonymousFunctionExpression": {
-		"beforeOpeningRoundBrace": true
-	},
-	"disallowSpacesInsideObjectBrackets": "all",
-	"disallowSpacesInsideArrayBrackets": "all",
-	"disallowSpacesInsideParentheses": true,
-
-	"disallowMultipleLineBreaks": true,
-	"disallowNewlineBeforeBlockStatements": true
-}

.jshintrc

@@ -1,4 +0,0 @@
-{
-	"undef": false,
-	"esversion": 6
-}

Dockerfile

@@ -0,0 +1,14 @@
+FROM ubuntu:latest
+RUN apt-get update --quiet \
+    && apt-get install --quiet --yes \
+    bsdtar \
+    curl \
+    git
+RUN ln --symbolic --force $(which bsdtar) $(which tar)
+RUN useradd --create-home --shell /bin/bash dicecloud
+USER dicecloud
+WORKDIR /home/dicecloud
+RUN curl https://install.meteor.com/?release=1.8.0.2 | sh
+ENV PATH="${PATH}:/home/dicecloud/.meteor"
+COPY dev.sh ./dev.sh
+ENTRYPOINT ./dev.sh

README.md

@@ -1,13 +1,89 @@
-RPG Docs
+DiceCloud
 ========
 
 This is the repo for [DiceCloud](dicecloud.com).
 
+DiceCloud is a free, auditable, real-time character sheet for D&D 5e.
+
+Philosophy
+----------
+
+Setting up your character on DiceCloud takes a little longer than
+just filling it in on a paper character sheet would. The goal of using an
+online sheet is to make actually playing the game more streamlined, and
+ultimately more fun. So putting a little extra effort into setting up a
+character now pays off over and over again once you're playing.
+
+The idea is to track where each number comes from, and allow you to easily make
+changes on the fly. Let's look at a hypothetical example.
+
+> You need to swim through a sunken section of dungeon to fetch the quest's Thing.
+> You'll need to take off your magical Plate Armor of +1 Constitution to swim
+> without sinking, of course.
+>
+> Taking it off will take away that disadvantage on
+> stealth checks, change your armor class, your speed and your constitution, and
+> which in turn changes your hit points and your constitution saving throw.
+> Working out all those changes in the middle of a game will drag the game to a
+> halt.
+>
+> Fortunately you have DiceCloud, so it's a matter of dragging
+> your Plate Armor +1 Con from your "equipment" box to your "backpack" box and
+> you're done. Your hitpoints change correctly, your saving throws are up to date,
+> your armor class goes back to reflecting the fact that you have natural armor
+> from being a dragonborn. Your character sheet keeps up and you
+> ultimately get more time to play the game. Huzzah!
+
 Getting started
 ---------------
 
-`git clone https://github.com/ThaumRystra/DiceCloud1 dicecloud`  
+Running DiceCloud locally, either to host it yourself away from an internet
+connection, or to contribute to developing it further, is fairly
+straightforward and it should work on Linux, Windows, and Mac.
+
+You'll need to have installed:
+
+- [git](https://www.atlassian.com/git/tutorials/install-git)
+- [Meteor](https://www.meteor.com/install)
+
+Then, it's just a matter of cloning this repository into a folder, and running
+`meteor` in the app directory.
+
+`git clone https://github.com/ThaumRystra/DiceCloud dicecloud`  
 `cd dicecloud`  
-`cd rpg-docs`  
-`bower install`  
+`cd app`  
+`meteor npm install`  
 `meteor`
+
+You should see this:
+
+```
+=> Started proxy.
+=> [HMR] Dev server listening on port 3003.
+=> Started MongoDB.
+=> Started your app.
+
+=> App running at: http://localhost:3000/
+```
+
+Environmental Variables
+-----------------------
+
+```
+MAIL_URL=smtp://<your smtp mail url>
+METEOR_SETTINGS={ "public": { "environment": "production", "patreon": { "clientId": "<your patreon client ID>", "campaignId": "<your campaign id>" } }, "patreon": { "clientSecret": "<your client secret>", "creatorAccessToken": "<your creator access token>" } }
+MONGO_OPLOG_URL=mongodb+srv://<your url for the oplog account of your mongo database>
+MONGO_URL=mongodb+srv://<your url for the read/write account of your mongo database>
+NPM_CONFIG_PRODUCTION=true
+PROJECT_DIR=app
+ROOT_URL=https://<url of your DiceCloud instance>
+DEFAULT_LIBRARIES=<comma separated list of library ids that will be subscribed by default: "abc123,def456">
+```
+
+To disable Patreon features and unlock all paid restrictions for all users of your deployment, replace
+`"patreon": { "clientId": ... }"` with `"disablePatreon": true` in the public key of the METEOR_SETTINGS environment variable.
+
+Alternatively run `meteor run --settings exampleMeteorSettings.json` to start the app with the example settings that disable Patreon by default.
+
+Now, visiting [](http://localhost:3000/) should show you an empty instance of
+DiceCloud running.

app/.gitignore

@@ -1,9 +1,11 @@
 .meteor/local
 .meteor/meteorite
 .demeteorized
+.cache
 settings.json
 public/components
 public/_imports.html
+private/oldClient
 nohup.out
 node_modules
 dump

app/.meteor/.finished-upgraders

@@ -13,3 +13,7 @@ notices-for-facebook-graph-api-2
 1.3.0-split-minifiers-package
 1.4.0-remove-old-dev-bundle-link
 1.4.1-add-shell-server-package
+1.4.3-split-account-service-packages
+1.5-add-dynamic-import-package
+1.7-split-underscore-from-meteor-base
+1.8.3-split-jquery-from-blaze

app/.meteor/packages

@@ -0,0 +1,53 @@
+# Meteor packages used by this project, one per line.
+#
+# 'meteor add' and 'meteor remove' will edit this file for you,
+# but you can also edit it by hand.
+
+accounts-password
+random
+dburles:collection-helpers
+reactive-var
+underscore
+momentjs:moment
+dburles:mongo-collection-instances
+accounts-google
+email
+meteorhacks:subs-manager
+chuangbo:marked
+meteor-base
+mobile-experience
+mongo
+session
+tracker
+logging
+reload
+ejson
+check
+standard-minifier-js
+shell-server
+templates:array
+ecmascript
+es5-shim
+reactive-dict
+percolate:synced-cron
+ongoworks:speakingurl
+service-configuration
+dynamic-import
+ddp-rate-limiter
+rate-limit
+mdg:validated-method
+akryum:vue-router2
+static-html
+aldeed:collection2
+aldeed:schema-index
+zer0th:meteor-vuetify-loader
+accounts-patreon
+bozhao:link-accounts
+peerlibrary:reactive-publish
+simple:rest
+simple:rest-method-mixin
+mikowals:batch-insert
+peerlibrary:subscription-data
+seba:minifiers-autoprefixer
+akryum:vue-component
+akryum:vue-sass

app/.meteor/release

@@ -0,0 +1 @@
+METEOR@2.2.1

app/.meteor/versions

@@ -0,0 +1,129 @@
+accounts-base@1.9.0
+accounts-google@1.3.3
+accounts-oauth@1.2.0
+accounts-password@1.7.1
+accounts-patreon@0.1.0
+akryum:npm-check@0.1.2
+akryum:vue-component@0.15.2
+akryum:vue-component-dev-client@0.4.7
+akryum:vue-component-dev-server@0.1.4
+akryum:vue-router2@0.2.3
+akryum:vue-sass@0.1.2
+aldeed:collection2@3.4.1
+aldeed:schema-index@3.0.0
+allow-deny@1.1.0
+autoupdate@1.7.0
+babel-compiler@7.6.2
+babel-runtime@1.5.0
+base64@1.0.12
+binary-heap@1.0.11
+blaze-tools@1.1.2
+boilerplate-generator@1.7.1
+bozhao:link-accounts@2.4.0
+caching-compiler@1.2.2
+caching-html-compiler@1.2.1
+callback-hook@1.3.0
+check@1.3.1
+chuangbo:marked@0.3.5_1
+coffeescript@2.4.1
+coffeescript-compiler@2.4.1
+dburles:collection-helpers@1.1.0
+dburles:mongo-collection-instances@0.3.5
+ddp@1.4.0
+ddp-client@2.4.1
+ddp-common@1.4.0
+ddp-rate-limiter@1.0.9
+ddp-server@2.3.3
+deps@1.0.12
+diff-sequence@1.1.1
+dynamic-import@0.6.0
+ecmascript@0.15.1
+ecmascript-runtime@0.7.0
+ecmascript-runtime-client@0.11.1
+ecmascript-runtime-server@0.10.1
+ejson@1.1.1
+email@2.0.0
+es5-shim@4.8.0
+fetch@0.1.1
+geojson-utils@1.0.10
+google-oauth@1.3.0
+hot-code-push@1.0.4
+html-tools@1.1.2
+htmljs@1.1.1
+http@1.4.4
+id-map@1.1.1
+inter-process-messaging@0.1.1
+lai:collection-extensions@0.2.1_1
+launch-screen@1.2.1
+livedata@1.0.18
+localstorage@1.2.0
+logging@1.2.0
+mdg:validated-method@1.2.0
+meteor@1.9.3
+meteor-base@1.4.0
+meteorhacks:subs-manager@1.6.4
+mikowals:batch-insert@1.2.0
+minifier-css@1.5.4
+minifier-js@2.6.1
+minimongo@1.6.2
+mobile-experience@1.1.0
+mobile-status-bar@1.1.0
+modern-browsers@0.1.5
+modules@0.16.0
+modules-runtime@0.12.0
+momentjs:moment@2.29.1
+mongo@1.11.1
+mongo-decimal@0.1.2
+mongo-dev-server@1.1.0
+mongo-id@1.0.8
+npm-bcrypt@0.9.4
+npm-mongo@3.9.0
+oauth@1.3.2
+oauth2@1.3.0
+ongoworks:speakingurl@9.0.0
+ordered-dict@1.1.0
+patreon-oauth@0.1.0
+peerlibrary:assert@0.3.0
+peerlibrary:check-extension@0.7.0
+peerlibrary:computed-field@0.10.0
+peerlibrary:data-lookup@0.3.0
+peerlibrary:extend-publish@0.6.0
+peerlibrary:fiber-utils@0.10.0
+peerlibrary:reactive-mongo@0.4.0
+peerlibrary:reactive-publish@0.10.0
+peerlibrary:server-autorun@0.8.0
+peerlibrary:subscription-data@0.8.0
+percolate:synced-cron@1.3.2
+promise@0.11.2
+raix:eventemitter@1.0.0
+random@1.2.0
+rate-limit@1.0.9
+react-fast-refresh@0.1.1
+reactive-dict@1.3.0
+reactive-var@1.0.11
+reload@1.3.1
+retry@1.1.0
+routepolicy@1.1.0
+seba:minifiers-autoprefixer@2.0.1
+service-configuration@1.0.11
+session@1.2.0
+sha@1.0.9
+shell-server@0.5.0
+simple:json-routes@2.1.0
+simple:rest@1.1.1
+simple:rest-method-mixin@1.0.1
+socket-stream-client@0.3.3
+spacebars-compiler@1.3.0
+srp@1.1.0
+standard-minifier-js@2.6.1
+static-html@1.3.2
+templates:array@1.0.3
+templating-tools@1.2.1
+tmeasday:check-npm-versions@1.0.2
+tracker@1.2.0
+typescript@4.2.2
+underscore@1.0.10
+url@1.3.2
+webapp@1.10.1
+webapp-hashing@1.1.0
+zer0th:meteor-vuetify-loader@0.1.30

app/client/head.html

@@ -1,9 +1,9 @@
 <head>
-	<meta name="viewport" content="width=device-width initial-scale=1.0, user-scalable=no">
+  <link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900" rel="stylesheet">
+  <link href="https://cdn.jsdelivr.net/npm/@mdi/font@5.x/css/materialdesignicons.min.css" rel="stylesheet">
+  <meta name="viewport" content="width=device-width initial-scale=1.0, user-scalable=no">
 	<meta name="mobile-web-app-capable" content="yes">
 	<meta name="apple-mobile-web-app-capable" content="yes">
-	<link href='https://fonts.googleapis.com/css?family=Roboto:400,300,300italic,400italic,500,500italic,700,700italic,900,900italic,100italic,100&subset=latin,latin-ext' rel='stylesheet' type='text/css'>
-
 	<link rel="apple-touch-icon" sizes="57x57" href="/apple-touch-icon-57x57.png?v=lk6WXp6Pmj">
 	<link rel="apple-touch-icon" sizes="60x60" href="/apple-touch-icon-60x60.png?v=lk6WXp6Pmj">
 	<link rel="apple-touch-icon" sizes="72x72" href="/apple-touch-icon-72x72.png?v=lk6WXp6Pmj">
@@ -23,4 +23,17 @@
 	<meta name="msapplication-TileColor" content="#b91d1d">
 	<meta name="msapplication-TileImage" content="/mstile-144x144.png?v=lk6WXp6Pmj">
 	<meta name="theme-color" content="#d12929">
+
+	<style type="text/css" media="print">
+		@page {
+			margin: 0mm;
+		}
+		html {
+			margin: 0px;
+		}
+		* {
+			-webkit-transition: none !important;
+			transition: none !important;
+		}
+	</style>
 </head>

app/client/index.html

@@ -0,0 +1,3 @@
+<body>
+  <div id="app"></div>
+</body>

app/client/main.js

@@ -0,0 +1,4 @@
+import '/imports/ui/vueSetup.js';
+import '/imports/ui/styles/stylesIndex.js';
+import '/imports/client/config.js';
+import '/imports/client/serviceWorker.js';

app/exampleMeteorSettings.json

@@ -0,0 +1,6 @@
+{
+  "public": {
+    "environment": "production",
+    "disablePatreon": true
+  }
+}

app/imports/api/creature/actions/applyAction.js

@@ -0,0 +1,13 @@
+import spendResources from '/imports/api/creature/actions/spendResources.js'
+import embedInlineCalculations from '/imports/api/creature/computation/afterComputation/embedInlineCalculations.js';
+
+export default function applyAction({prop, log}){
+  let content = { name: prop.name };
+  if (prop.summary){
+    content.value = embedInlineCalculations(
+      prop.summary, prop.summaryCalculations
+    );
+  }
+  log.content.push(content);
+  spendResources({prop, log});
+}

app/imports/api/creature/actions/applyAdjustment.js

@@ -0,0 +1,55 @@
+import evaluateString from '/imports/api/creature/computation/afterComputation/evaluateString.js';
+import damagePropertiesByName from '/imports/api/creature/creatureProperties/methods/damagePropertiesByName.js';
+
+export default function applyAdjustment({
+  prop,
+  creature,
+  targets,
+  actionContext,
+  log
+}){
+  let damageTargets = prop.target === 'self' ? [creature] : targets;
+  let scope = {
+    ...creature.variables,
+    ...actionContext,
+  };
+  var {result, context} = evaluateString({
+    string: prop.amount,
+    scope,
+    fn: 'reduce'
+  });
+  context.errors.forEach(e => {
+    log.content.push({
+      name: 'Attribute damage error',
+      value: e.message || e.toString(),
+    });
+  });
+  if (damageTargets) {
+    damageTargets.forEach(target => {
+      if (prop.target === 'each'){
+        ({result} = evaluateString({
+          string: prop.amount,
+          scope,
+          fn: 'reduce'
+        }));
+      }
+      damagePropertiesByName.call({
+        creatureId: target._id,
+        variableName: prop.stat,
+        operation: prop.operation || 'increment',
+        value: result.value,
+      });
+      log.content.push({
+        name: 'Attribute damage',
+        value: `${prop.stat}${prop.operation === 'set' ? ' set to' : ''}` +
+        ` ${result.isNumber ? -result.value : result.toString()}`,
+      });
+    });
+  } else {
+    log.content.push({
+      name: 'Attribute damage',
+      value: `${prop.stat}${prop.operation === 'set' ? ' set to' : ''}` +
+      ` ${result.isNumber ? -result.value : result.toString()}`,
+    });
+  }
+}

app/imports/api/creature/actions/applyAttack.js

@@ -0,0 +1,22 @@
+import roll from '/imports/parser/roll.js';
+
+export default function applyAttack({
+  prop,
+  log,
+  actionContext,
+  creature,
+}){
+  let value = roll(1, 20)[0];
+  actionContext.attackRoll = {value};
+  let criticalHitTarget = creature.variables.criticalHitTarget &&
+    creature.variables.criticalHitTarget.currentValue || 20;
+  let criticalHit = value >= criticalHitTarget;
+  if (criticalHit) actionContext.criticalHit = {value: true};
+  let result = value + prop.rollBonusResult;
+  actionContext.toHit = {value: result};
+
+  log.content.push({
+    name: criticalHit ? 'Critical Hit!' : 'To Hit',
+    value: `1d20 [${value}] + ${prop.rollBonusResult} = ` + result,
+  });
+}

app/imports/api/creature/actions/applyBuff.js

@@ -0,0 +1,61 @@
+import {
+	setLineageOfDocs,
+	renewDocIds
+} from '/imports/api/parenting/parenting.js';
+import {setDocToLastOrder} from '/imports/api/parenting/order.js';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+
+export default function applyBuff({
+  prop,
+  children,
+  creature,
+  targets = [],
+  //actionContext,
+}){
+  let buffTargets = prop.target === 'self' ? [creature] : targets;
+
+  //let scope = {
+  //  ...creature.variables,
+  //  ...actionContext,
+  //};
+
+  // TODO
+  // If the target is not self, walk through all decendants and replace
+  // variables in calculations with their values from the creature scope
+  // If the target is self, replace all the target.x references with just x
+
+  // Then copy the decendants of the buff to the targets
+  prop.applied = true;
+  let propList = [prop];
+  function addChildrenToPropList(children){
+    children.forEach(child => {
+      propList.push(child.node);
+      addChildrenToPropList(child.children);
+    });
+  }
+  addChildrenToPropList(children);
+  let oldParent = {
+    id: prop.parent.id,
+    collection: prop.parent.collection,
+  };
+  buffTargets.forEach(target => {
+    copyNodeListToTarget(propList, target, oldParent);
+  });
+}
+
+function copyNodeListToTarget(propList, target, oldParent){
+  let ancestry = [{collection: 'creatures', id: target._id}];
+  setLineageOfDocs({
+    docArray: propList,
+    newAncestry: ancestry,
+    oldParent,
+  });
+  renewDocIds({
+    docArray: propList,
+  });
+  setDocToLastOrder({
+    collection: CreatureProperties,
+    doc: propList[0],
+  });
+  CreatureProperties.batchInsert(propList);
+}

app/imports/api/creature/actions/applyDamage.js

@@ -0,0 +1,115 @@
+import evaluateString from '/imports/api/creature/computation/afterComputation/evaluateString.js';
+import dealDamage from '/imports/api/creature/creatureProperties/methods/dealDamage.js';
+import {insertCreatureLog} from '/imports/api/creature/log/CreatureLogs.js';
+import { CompilationContext } from '/imports/parser/parser.js';
+
+export default function applyDamage({
+  prop,
+  creature,
+  targets,
+  actionContext,
+  log,
+}){
+  let damageTargets = prop.target === 'self' ? [creature] : targets;
+  let scope = {
+    ...creature.variables,
+    ...actionContext,
+  };
+  // Add the target's variables to the scope
+  if (targets.length === 1){
+    scope.target = targets[0].variables;
+  }
+  // Determine if the hit is critical
+  let criticalHit = !!(
+    actionContext.criticalHit &&
+    actionContext.criticalHit.value &&
+    prop.damageType !== 'healing' // Can't critically heal
+  );
+  // Double the damage rolls if the hit is critical
+  let context = new CompilationContext({
+    doubleRolls: criticalHit,
+  });
+
+  // Compute the roll the first time, logging any errors
+  var {result} = evaluateString({
+    string: prop.amount,
+    scope,
+    fn: 'reduce',
+    context
+  });
+
+  // If the result is an error bail out now
+  if (result.constructor.name === 'ErrorNode'){
+    log.content.push({
+      name: 'Damage error',
+      value: result.toString(),
+    });
+    return;
+  }
+
+  // Memoise the damage suffix for the log
+  let suffix = (criticalHit ? ' critical ' : ' ') +
+    prop.damageType +
+    (prop.damageType !== ' healing ' ? ' damage ': '');
+
+  if (damageTargets && damageTargets.length) {
+    // Iterate through all the targets
+    damageTargets.forEach(target => {
+      let name = prop.damageType === 'healing' ? 'Healing' : 'Damage';
+
+      // Reroll the damage if needed
+      if (prop.target === 'each'){
+        ({result, context} = evaluateString({
+          string: prop.amount,
+          scope,
+          fn: 'reduce'
+        }));
+      }
+      // If the result is an error or not a number bail out now
+      if (result.constructor.name === 'ErrorNode' || !result.isNumber){
+        log.content.push({
+          name: 'Damage error',
+          value: result.toString(),
+        });
+        return;
+      }
+
+      // Deal the damage to the target
+      let damageDealt = dealDamage.call({
+        creatureId: target._id,
+        damageType: prop.damageType,
+        amount: result.value,
+      });
+
+      // Log the damage done
+      if (target._id === creature._id){
+        // Target is same as self, log damage as such
+        log.content.push({
+          name,
+          value: damageDealt + suffix + ' to self',
+        });
+      } else {
+        log.content.push({
+          name,
+          value: 'Dealt ' + damageDealt + suffix + ` ${target.name && ' to '}${target.name}`,
+        });
+        // Log the damage received on that creature's log as well
+        insertCreatureLog.call({
+          log: {
+            creatureId: target._id,
+            content: [{
+              name,
+              value: 'Recieved ' + damageDealt + suffix,
+            }],
+          }
+        });
+      }
+    });
+  } else {
+    // There are no targets, just log the result
+    log.content.push({
+      name: prop.damageType === 'healing' ? 'Healing' : 'Damage',
+      value: result.toString() + suffix,
+    });
+  }
+}

app/imports/api/creature/actions/applyProperties.js

@@ -0,0 +1,82 @@
+import applyAction from '/imports/api/creature/actions/applyAction.js';
+import applyAdjustment from '/imports/api/creature/actions/applyAdjustment.js';
+import applyAttack from '/imports/api/creature/actions/applyAttack.js';
+import applyBuff from '/imports/api/creature/actions/applyBuff.js';
+import applyDamage from '/imports/api/creature/actions/applyDamage.js';
+import applyRoll from '/imports/api/creature/actions/applyRoll.js';
+import applyToggle from '/imports/api/creature/actions/applyToggle.js';
+import applySave from '/imports/api/creature/actions/applySave.js';
+
+function applyProperty(options){
+  let prop = options.prop;
+  if (prop.type === 'buff'){
+    // ignore only applied buffs, don't apply them again
+    if (prop.applied === true){
+      return false;
+    }
+  // Only ignore toggles if they wont be computed
+  } else if (prop.type === 'toggle') {
+    if (prop.disabled) return false;
+    if (prop.enabled) return true;
+    if (!prop.condition) return false;
+  // Ignore inactive props of other types
+  } else if (prop.deactivatedBySelf === true){
+    return false;
+  }
+  switch (prop.type){
+    case 'action':
+    case 'spell':
+      applyAction(options);
+      break;
+    case 'attack':
+      applyAction(options);
+      applyAttack(options);
+      break;
+    case 'damage':
+      applyDamage(options);
+      break;
+    case 'adjustment':
+      applyAdjustment(options);
+      break;
+    case 'buff':
+      applyBuff(options);
+      return false;
+    case 'toggle':
+      return applyToggle(options);
+    case 'roll':
+      applyRoll(options);
+      break;
+    case 'savingThrow':
+      return applySave(options);
+  }
+  return true;
+}
+
+function applyPropertyAndWalkChildren({prop, children, targets, ...options}){
+  let shouldKeepWalking = applyProperty({ prop, children, targets, ...options });
+  if (shouldKeepWalking){
+    applyProperties({ forest: children, targets, ...options,});
+  }
+}
+
+export default function applyProperties({ forest, targets, ...options}){
+  forest.forEach(node => {
+    let prop = node.node;
+    options.actionContext[`#${prop.type}`] = prop;
+    let children = node.children;
+    if (shouldSplit(prop) && targets.length){
+      targets.forEach(target => {
+        let targets = [target]
+        applyPropertyAndWalkChildren({ targets, prop, children, ...options});
+      });
+    } else {
+      applyPropertyAndWalkChildren({prop, children, targets, ...options});
+    }
+  });
+}
+
+function shouldSplit(prop){
+  if (prop.target === 'each'){
+    return true;
+  }
+}

app/imports/api/creature/actions/applyRoll.js

@@ -0,0 +1,25 @@
+import evaluateString from '/imports/api/creature/computation/afterComputation/evaluateString.js';
+
+export default function applyRoll({
+  prop,
+  creature,
+  actionContext,
+  log,
+}){
+  let scope = {
+    ...creature.variables,
+    ...actionContext,
+  };
+  var {result} = evaluateString({
+    string: prop.roll,
+    scope,
+    fn: 'reduce'
+  });
+  if (result.isNumber){
+    actionContext[prop.variableName] = result.value;
+  }
+  log.content.push({
+    name: prop.name,
+    value: prop.variableName + ' = ' + prop.roll + ' = ' + result.toString(),
+  });
+}

app/imports/api/creature/actions/applySave.js

@@ -0,0 +1,76 @@
+import evaluateString from '/imports/api/creature/computation/afterComputation/evaluateString.js';
+import CreaturesProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import roll from '/imports/parser/roll.js';
+
+export default function applySave({
+  prop,
+  creature,
+  actionContext,
+  log,
+}){
+  let scope = {
+    ...creature.variables,
+    ...actionContext,
+  };
+  try {
+    // Calculate the DC
+    var {result} = evaluateString({
+      string: prop.dc,
+      scope,
+      fn: 'reduce'
+    });
+    let dc = result.value;
+    log.content.push({
+      name: prop.name,
+      value: ' DC ' + result.toString(),
+    });
+    if (prop.target === 'self'){
+      let save = CreaturesProperties.findOne({
+        'ancestors.id': creature._id,
+        type: 'skill',
+        skillType: 'save',
+        variableName: prop.stat,
+        removed: {$ne: true},
+        inactive: {$ne: true},
+      });
+      if (!save){
+        log.content.push({
+          name: 'Saving throw error',
+          value: 'No saving throw found: ' + prop.stat,
+        });
+        return;
+      }
+      let value, values, resultPrefix;
+      if (save.advantage === 1){
+        values = roll(2, 20).sort().reverse();
+        value = values[0];
+        resultPrefix = `Advantage: 1d20 [${values[0]},~~${values[1]}~~] + ${save.value} = `
+      } else if (save.advantage === -1){
+        values = roll(2, 20).sort();
+        value = values[0];
+        resultPrefix = `Disadvantage: 1d20 [${values[0]},~~${values[1]}~~] + ${save.value} = `
+      } else {
+        values = roll(1, 20);
+        value = values[0];
+        resultPrefix = `1d20 [${value}] + ${save.value} = `
+      }
+      actionContext.savingThrowRoll = {value};
+      let result = value + save.value;
+      actionContext.savingThrow = {value: result};
+      let saveSuccess = result >= dc;
+      log.content.push({
+        name: 'Save',
+        value: resultPrefix + result + (saveSuccess ? 'Passed' : 'Failed')
+      });
+      return !saveSuccess;
+    } else {
+      // TODO
+      return true;
+    }
+  } catch (e){
+    log.content.push({
+      name: 'Save error',
+      value: e.toString(),
+    });
+  }
+}

app/imports/api/creature/actions/applyToggle.js

@@ -0,0 +1,33 @@
+import evaluateString from '/imports/api/creature/computation/afterComputation/evaluateString.js';
+
+export default function applyToggle({
+  prop,
+  creature,
+  actionContext,
+  log,
+}){
+  let scope = {
+    ...creature.variables,
+    ...actionContext,
+  };
+  if (Number.isFinite(+prop.condition)){
+    return !!+prop.condition;
+  }
+  var {result} = evaluateString({
+    string: prop.condition,
+    scope,
+    fn: 'reduce'
+  });
+  if (result.constructor.name === 'ErrorNode') {
+    log.content.push({
+      name: 'Toggle error',
+      value: result.toString(),
+    });
+    return false;
+  }
+  log.content.push({
+    name: prop.name || 'Toggle',
+    value: prop.condition + ' = ' + result.toString(),
+  });
+  return !!result.value;
+}

app/imports/api/creature/actions/castSpellWithSlot.js

@@ -0,0 +1,92 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import { damagePropertyWork } from '/imports/api/creature/creatureProperties/methods/damageProperty.js';
+import { assertEditPermission } from '/imports/api/creature/creatures/creaturePermissions.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import { doActionWork } from '/imports/api/creature/actions/doAction.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import getAncestorContext from '/imports/api/creature/actions/getAncestorContext.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties';
+
+const castSpellWithSlot = new ValidatedMethod({
+  name: 'creatureProperties.castSpellWithSlot',
+  validate: new SimpleSchema({
+    spellId: SimpleSchema.RegEx.Id,
+    slotId: {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+      optional: true,
+    },
+    targetId: {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+      optional: true,
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 10,
+    timeInterval: 5000,
+  },
+  run({spellId, slotId, targetId}) {
+    let spell = CreatureProperties.findOne(spellId);
+		// Check permissions
+    let creature = getRootCreatureAncestor(spell);
+    assertEditPermission(creature, this.userId);
+    let target = undefined;
+    if (targetId) {
+      target = Creatures.findOne(targetId);
+      assertEditPermission(target, this.userId);
+    }
+    let slotLevel = spell.level || 0;
+    if (slotLevel !== 0){
+      let slot = CreatureProperties.findOne(slotId);
+      if (!slot){
+        throw new Meteor.Error('No slot',
+          'Slot not found to cast spell');
+      }
+      if (!slot.currentValue){
+        throw new Meteor.Error('No slot',
+          'Slot depleted');
+      }
+      if (!(slot.spellSlotLevelValue >= spell.level)){
+        throw new Meteor.Error('Slot too small',
+          'Slot is not large enough to cast spell');
+      }
+      slotLevel = slot.spellSlotLevelValue;
+      damagePropertyWork({
+        property: slot,
+        operation: 'increment',
+        value: 1,
+      });
+    }
+    let actionContext = getAncestorContext(spell);
+
+    doActionWork({
+      action: spell,
+      actionContext: {slotLevel, ...actionContext},
+      creature,
+      targets: target ? [target] : [],
+      method: this,
+    });
+
+    // Note these lines only recompute the top-level creature, not the nearest one
+    // The acting creature might have a new item
+    recomputeInventory(creature._id);
+    // The spell might add properties which need to be activated
+    recomputeInactiveProperties(creature._id);
+    recomputeCreatureByDoc(creature);
+
+    if (target){
+      recomputeInventory(target._id);
+      recomputeInactiveProperties(target._id);
+      recomputeCreatureByDoc(target);
+    }
+  },
+});
+
+export default castSpellWithSlot;

app/imports/api/creature/actions/doAction.js

@@ -0,0 +1,99 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import { CreatureLogSchema, insertCreatureLogWork } from '/imports/api/creature/log/CreatureLogs.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { assertEditPermission } from '/imports/api/creature/creatures/creaturePermissions.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import nodesToTree from '/imports/api/parenting/nodesToTree.js';
+import applyProperties from '/imports/api/creature/actions/applyProperties.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties.js';
+import getAncestorContext from '/imports/api/creature/actions/getAncestorContext.js';
+
+const doAction = new ValidatedMethod({
+  name: 'creatureProperties.doAction',
+  validate: new SimpleSchema({
+    actionId: SimpleSchema.RegEx.Id,
+    targetIds: {
+      type: Array,
+      defaultValue: [],
+      maxCount: 10,
+      optional: true,
+    },
+    'targetIds.$': {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 10,
+    timeInterval: 5000,
+  },
+  run({actionId, targetIds = []}) {
+    let action = CreatureProperties.findOne(actionId);
+		// Check permissions
+    let creature = getRootCreatureAncestor(action);
+
+    // Build ancestor context
+    let actionContext = getAncestorContext(action);
+
+    assertEditPermission(creature, this.userId);
+    let targets = [];
+    targetIds.forEach(targetId => {
+      let target = Creatures.findOne(targetId);
+      assertEditPermission(target, this.userId);
+      targets.push(target);
+    });
+		doActionWork({action, creature, targets, actionContext, method: this});
+
+    // The acting creature might have used ammo
+    recomputeInventory(creature._id);
+
+    // The action might add properties which need to be activated
+    recomputeInactiveProperties(creature._id);
+
+    // recompute creatures
+		recomputeCreatureByDoc(creature);
+    targets.forEach(target => {
+      recomputeInactiveProperties(target._id);
+      recomputeCreatureByDoc(target);
+    });
+  },
+});
+
+export function doActionWork({
+  action,
+  creature,
+  targets,
+  actionContext = {},
+  method
+}){
+  // Create the log
+  let log = CreatureLogSchema.clean({
+    creatureId: creature._id,
+    creatureName: creature.name,
+  });
+
+  let decendantForest = nodesToTree({
+    collection: CreatureProperties,
+    ancestorId: action._id,
+  });
+  let startingForest = [{
+    node: action,
+    children: decendantForest,
+  }];
+  applyProperties({
+    forest: startingForest,
+    actionContext,
+    creature,
+    targets,
+    log,
+  });
+  insertCreatureLogWork({log, creature, method});
+}
+
+export default doAction;

app/imports/api/creature/actions/doCheck.js

@@ -0,0 +1,56 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import { assertEditPermission } from '/imports/api/creature/creatures/creaturePermissions.js';
+import roll from '/imports/parser/roll.js';
+
+const doCheck = new ValidatedMethod({
+  name: 'creature.doCheck',
+  validate: new SimpleSchema({
+    creatureId: {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+      optional: true,
+    },
+    attributeName: {
+      type: String,
+      optional: true,
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 10,
+    timeInterval: 5000,
+  },
+  run({creatureId, attributeName}) {
+    let creature = Creatures.findOne(creatureId);
+    assertEditPermission(creature, this.userId);
+    let bonus = getAttributeValue({creature, attributeName})
+		return doCheckWork({bonus});
+  },
+});
+
+function getAttributeValue({creature, attributeName}){
+  let att = creature.variables[attributeName];
+  if (!att) throw new Meteor.Error('No such attribute',
+    `This creature does not have a ${attributeName} property`);
+  let bonus = att.attributeType === 'ability'? att.modifier : att.value;
+  return bonus || 0;
+}
+
+export function doCheckWork({bonus, advantage = 0}){
+  let rolls = roll(2,20);
+  let chosenRoll;
+  if (advantage === 1){
+    chosenRoll = Math.max.apply(rolls);
+  } else if (advantage === -1){
+    chosenRoll = Math.min.apply(rolls);
+  } else {
+    chosenRoll = rolls[0];
+  }
+  let result = chosenRoll + bonus;
+  return {rolls, bonus, chosenRoll, result};
+}
+
+export default doCheck;

app/imports/api/creature/actions/getAncestorContext.js

@@ -0,0 +1,15 @@
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+
+export default function getAncestorContext(prop){
+  // Build ancestor context
+  const actionContext = {};
+  let ancestorIds = prop.ancestors.map(ref => ref.id);
+  CreatureProperties.find({
+    _id: {$in: ancestorIds}
+  }, {
+    sort: {order: 1},
+  }).forEach(ancestor => {
+    actionContext[`#${ancestor.type}`] = ancestor;
+  });
+  return actionContext;
+}

app/imports/api/creature/actions/spendResources.js

@@ -0,0 +1,93 @@
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { adjustQuantityWork } from '/imports/api/creature/creatureProperties/methods/adjustQuantity.js';
+import { damagePropertyWork } from '/imports/api/creature/creatureProperties/methods/damageProperty.js';
+
+export default function spendResources({prop, log}){
+  // Check Uses
+  if (prop.usesUsed >= prop.usesResult){
+    throw new Meteor.Error('Insufficient Uses',
+      'This prop has no uses left');
+  }
+  // Resources
+  if (prop.insufficientResources){
+    throw new Meteor.Error('Insufficient Resources',
+      'This creature doesn\'t have sufficient resources to perform this prop');
+  }
+  // Items
+  let itemQuantityAdjustments = [];
+  let spendLog = [];
+  let gainLog = [];
+  prop.resources.itemsConsumed.forEach(itemConsumed => {
+    if (!itemConsumed.itemId){
+      throw new Meteor.Error('Ammo not selected',
+        'No ammo was selected for this prop');
+    }
+    let item = CreatureProperties.findOne(itemConsumed.itemId);
+    if (!item || item.ancestors[0].id !== prop.ancestors[0].id){
+      throw new Meteor.Error('Ammo not found',
+        'The prop\'s ammo was not found on the creature');
+    }
+    if (!item.equipped){
+      throw new Meteor.Error('Ammo not equipped',
+        'The selected ammo is not equipped');
+    }
+    if (!itemConsumed.quantity) return;
+    itemQuantityAdjustments.push({
+      property: item,
+      operation: 'increment',
+      value: itemConsumed.quantity,
+    });
+    let logName = item.name;
+    if (itemConsumed.quantity > 1 || itemConsumed.quantity < -1){
+      logName = item.plural || logName;
+    }
+    if (itemConsumed.quantity > 0){
+      spendLog.push(logName + ': ' + itemConsumed.quantity);
+    } else if (itemConsumed.quantity < 0){
+      gainLog.push(logName + ': ' + -itemConsumed.quantity);
+    }
+  });
+  // No more errors should be thrown after this line
+  // Now that we have confirmed that there are no errors, do actual work
+  //Items
+  itemQuantityAdjustments.forEach(adjustQuantityWork);
+
+  // Use uses
+  if (prop.usesResult){
+    CreatureProperties.update(prop._id, {
+      $inc: {usesUsed: 1}
+    }, {
+      selector: prop
+    });
+    log.content.push({
+      name: 'Uses left',
+      value: prop.usesResult - (prop.usesUsed || 0) - 1,
+    });
+  }
+
+  // Damage stats
+  prop.resources.attributesConsumed.forEach(attConsumed => {
+    if (!attConsumed.quantity) return;
+    let stat = CreatureProperties.findOne(attConsumed.statId);
+    damagePropertyWork({
+      property: stat,
+      operation: 'increment',
+      value: attConsumed.quantity,
+    });
+    if (attConsumed.quantity > 0){
+      spendLog.push(stat.name + ': ' + attConsumed.quantity);
+    } else if (attConsumed.quantity < 0){
+      gainLog.push(stat.name + ': ' + -attConsumed.quantity);
+    }
+  });
+
+  // Log all the spending
+  if (gainLog.length) log.content.push({
+    name: 'Gained',
+    value: gainLog.join('\n'),
+  });
+  if (spendLog.length) log.content.push({
+    name: 'Spent',
+    value: spendLog.join('\n'),
+  });
+}

app/imports/api/creature/archive/ArchivedCreatures.js

@@ -0,0 +1,57 @@
+import SimpleSchema from 'simpl-schema';
+
+// Archived creatures is an immutable collection of creatures that are no longer
+// in use and can be safely archived by the mongoDB hosting service.
+// It keeps the working datasets like creatureProperties much smaller
+// than they would otherwise be.
+let ArchivedCreatures = new Mongo.Collection('archivedCreatures');
+
+// We use blackbox objects for everything:
+// - saves time checking every object against a schema
+// - doesn't accidentaly create indices defined in subschemas
+// - The objects we are archiving have already been checked against their
+//   own schemas
+let ArchivedCreatureSchema = new SimpleSchema({
+  owner: {
+		type: String,
+		regEx: SimpleSchema.RegEx.Id,
+    // The primary index on this collection
+		index: 1,
+	},
+  archiveDate: {
+    type: Date,
+    // Indexed so the archiving system can archive documents when they
+    // get to a certain age
+    index: 1,
+  },
+	creature: {
+    type: Object,
+    blackbox: true,
+  },
+  properties: {
+    type: Array,
+  },
+  'properties.$': {
+    type: Object,
+    blackbox: true,
+  },
+  experiences: {
+    type: Array,
+  },
+  'experiences.$': {
+    type: Object,
+    blackbox: true,
+  },
+  logs: {
+    type: Array,
+  },
+  'logs.$': {
+    type: Object,
+    blackbox: true,
+  },
+});
+
+ArchivedCreatures.attachSchema(ArchivedCreatureSchema);
+
+import '/imports/api/creature/archive/methods/index.js';
+export default ArchivedCreatures;

app/imports/api/creature/archive/methods/archiveCreatures.js

@@ -0,0 +1,66 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import { assertOwnership } from '/imports/api/creature/creatures/creaturePermissions.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import CreatureLogs from '/imports/api/creature/log/CreatureLogs.js';
+import Experiences from '/imports/api/creature/experience/Experiences.js';
+import { removeCreatureWork } from '/imports/api/creature/creatures/methods/removeCreature.js';
+import ArchivedCreatures from '/imports/api/creature/archive/ArchivedCreatures.js';
+
+function archiveCreature(creatureId){
+  // Build the archive document
+  const creature = Creatures.findOne(creatureId);
+  const properties = CreatureProperties.find({'ancestors.id': creatureId}).fetch();
+  const experiences = Experiences.find({creatureId}).fetch();
+  const logs = CreatureLogs.find({creatureId}).fetch();
+  let archiveCreature = {
+    owner: creature.owner,
+    archiveDate: new Date(),
+    creature,
+    properties,
+    experiences,
+    logs,
+  };
+
+  // Insert it
+  let id = ArchivedCreatures.insert(archiveCreature);
+
+  // Remove the original creature
+  removeCreatureWork(creatureId);
+
+  return id;
+}
+
+const archiveCreatures = new ValidatedMethod({
+  name: 'Creatures.methods.archiveCreatures',
+  validate: new SimpleSchema({
+    creatureIds: {
+      type: Array,
+      max: 10,
+    },
+    'creatureIds.$': {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 1,
+    timeInterval: 5000,
+  },
+  run({creatureIds}) {
+    for (let id of creatureIds){
+      assertOwnership(id, this.userId)
+    }
+    let archivedIds = [];
+    for (let id of creatureIds){
+      let archivedId = archiveCreature(id);
+      archivedIds.push(archivedId);
+    }
+    return archivedIds;
+  },
+});
+
+export default archiveCreatures;

app/imports/api/creature/archive/methods/index.js

@@ -0,0 +1,2 @@
+import '/imports/api/creature/archive/methods/archiveCreatures.js';
+import '/imports/api/creature/archive/methods/restoreCreatures.js';

app/imports/api/creature/archive/methods/restoreCreatures.js

@@ -0,0 +1,77 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import { assertOwnership } from '/imports/api/sharing/sharingPermissions.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import CreatureLogs from '/imports/api/creature/log/CreatureLogs.js';
+import Experiences from '/imports/api/creature/experience/Experiences.js';
+import ArchivedCreatures from '/imports/api/creature/archive/ArchivedCreatures.js';
+import { removeCreatureWork } from '/imports/api/creature/creatures/methods/removeCreature.js';
+
+function restoreCreature(archiveId){
+  // Get the archive
+  const archivedCreature = ArchivedCreatures.findOne(archiveId);
+
+  // Insert the creature sub documents
+  // They still have their original _id's
+  Creatures.insert(archivedCreature.creature);
+  try {
+    // Add all the properties
+    if (archivedCreature.properties && archivedCreature.properties.length){
+      CreatureProperties.batchInsert(archivedCreature.properties);
+    }
+    if (archivedCreature.experiences && archivedCreature.experiences.length){
+      Experiences.batchInsert(archivedCreature.experiences);
+    }
+    if (archivedCreature.logs && archivedCreature.logs.length){
+      CreatureLogs.batchInsert(archivedCreature.logs);
+    }
+    // Remove the archived creature
+    ArchivedCreatures.remove(archiveId);
+  } catch (e) {
+    // If the above fails, delete the inserted creature
+    removeCreatureWork(archivedCreature.creature._id);
+    throw e;
+  }
+
+  // Do not recompute. The creature was in a computed and ordered state when
+  // we archived it, just restore everything as-is
+
+  return archivedCreature.creature._id;
+}
+
+const restoreCreatures = new ValidatedMethod({
+  name: 'Creatures.methods.restoreCreatures',
+  validate: new SimpleSchema({
+    archiveIds: {
+      type: Array,
+      max: 10,
+    },
+    'archiveIds.$': {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 1,
+    timeInterval: 5000,
+  },
+  run({archiveIds}) {
+    for (let id of archiveIds){
+      let archivedCreature = ArchivedCreatures.findOne(id, {
+        fields: {owner: 1}
+      });
+      assertOwnership(archivedCreature, this.userId)
+    }
+    let creatureIds = [];
+    for (let id of archiveIds){
+      let creatureId = restoreCreature(id);
+      creatureIds.push(creatureId);
+    }
+    return creatureIds;
+  },
+});
+
+export default restoreCreatures;

app/imports/api/creature/computation/afterComputation/embedInlineCalculations.js

@@ -0,0 +1,11 @@
+import INLINE_CALCULATION_REGEX from '/imports/constants/INLINE_CALCULTION_REGEX.js';
+
+export default function embedInlineCalculations(string, calculations){
+  if (!string) return '';
+  if (!calculations) return string;
+  let index = 0;
+  return string.replace(INLINE_CALCULATION_REGEX, substring => {
+    let comp = calculations && calculations[index++];
+    return (comp && 'result' in comp) ? comp.result : substring;
+  });
+}

app/imports/api/creature/computation/afterComputation/evaluateString.js

@@ -0,0 +1,67 @@
+import { parse, CompilationContext } from '/imports/parser/parser.js';
+import ConstantNode from '/imports/parser/parseTree/ConstantNode.js';
+import SymbolNode from '/imports/parser/parseTree/SymbolNode.js';
+import ErrorNode from '/imports/parser/parseTree/ErrorNode.js';
+
+//TODO replace constants with their parsed node
+
+export default function evaluateString({string, scope, fn = 'compile', context}){
+  if (!context){
+    context = new CompilationContext({});
+  }
+  if (!string){
+    context.storeError('No string provided');
+    return {result: {value: string}, context};
+  }
+
+  if (!scope) context.storeError('No scope provided');
+
+  // Parse the string using mathjs
+  let node;
+  try {
+    node = parse(string);
+  } catch (e) {
+    context.storeError(e);
+    return {result: {value: string}, context};
+  }
+  node = replaceConstants({calc: node, context, scope});
+  let result = node[fn](scope, context);
+  return {result, context};
+}
+
+// Replace constants in the calc with the right ParseNodes
+function replaceConstants({calc, context, scope}){
+  let constFailed = [];
+  calc = calc.replaceNodes(node => {
+    if (!(node instanceof SymbolNode)) return;
+    let constant = scope[node.name];
+    // replace constants that aren't overridden by stats or disabled by a toggle
+    if (constant && constant.type === 'constant'){
+      // Fail if the constant has errors
+      if (constant.errors && constant.errors.length){
+        constFailed.push(node.name);
+        return;
+      }
+      let parsedConstantNode;
+      try {
+        parsedConstantNode = parse(constant.calculation);
+      } catch(e){
+        constFailed.push(node.name);
+        return;
+      }
+      if (!parsedConstantNode) constFailed.push(node.name);
+      return parsedConstantNode;
+    }
+  });
+  constFailed.forEach(name => {
+    context.storeError({
+      type: 'error',
+      message: `${name} is a constant property with parsing errors`
+    });
+  });
+  let failed = !!constFailed.length;
+  if (failed){
+    calc = new ErrorNode({error: 'Failed to replace constants'});
+  }
+  return calc;
+}

app/imports/api/creature/computation/creatureComputation.test.js

@@ -0,0 +1,97 @@
+import {computeCreature} from "./recomputeCreature.js";
+import assert from "assert";
+
+const makeEffect = function(operation, value){
+  let effect = {computed: false, result: 0, operation}
+  if (_.isFinite(value)){
+    effect.value = +value;
+  } else {
+    effect.calculation = value;
+  }
+  return effect;
+}
+
+describe('computeCreature', function () {
+  it('computes an aritrary creature', function () {
+    let char = {
+      atts: {
+        attribute1: {
+          computed: false,
+          busyComputing: false,
+          type: "attribute",
+          attributeType: "ability",
+          result: 0,
+          mod: 0, // The resulting modifier if this is an ability
+          base: 0,
+          add: 0,
+          mul: 1,
+          min: Number.NEGATIVE_INFINITY,
+          max: Number.POSITIVE_INFINITY,
+          effects: [
+            makeEffect("base", 10),
+            makeEffect("add", 5),
+            makeEffect("mul", 2),
+          ],
+        },
+        attribute2: {
+          computed: false,
+          busyComputing: false,
+          type: "attribute",
+          result: 0,
+          mod: 0, // The resulting modifier if this is an ability
+          base: 0,
+          add: 0,
+          mul: 1,
+          min: Number.NEGATIVE_INFINITY,
+          max: Number.POSITIVE_INFINITY,
+          effects: [
+            makeEffect("base", "attribute1"),
+            makeEffect("max", 2),
+          ],
+        },
+      },
+      skills: {
+        skill1: {
+          computed: false,
+          busyComputing: false,
+          type: "skill",
+          ability: "attribute1",
+          result: 0,
+          proficiency: 0,
+          add: 0,
+          mul: 1,
+          min: Number.NEGATIVE_INFINITY,
+          max: Number.POSITIVE_INFINITY,
+          advantage: 0,
+          disadvantage: 0,
+          passiveAdd: 0,
+          fail: 0,
+          conditional: 0,
+          effects: [],
+          proficiencies: [],
+        },
+      },
+      dms: {
+        dm1: {
+          computed: false,
+          busyComputing: false,
+          type: "damageMultiplier",
+          result: 0,
+          immunityCount: 0,
+          ressistanceCount: 0,
+          vulnerabilityCount: 0,
+          effects: [],
+        }
+      },
+      classes: {
+        Barbarian: {
+          level: 5,
+        },
+      },
+      level: 5,
+    };
+    char = computeCreature(char);
+    console.log(char);
+    assert(true);
+  });
+});

app/imports/api/creature/computation/engine/ComputationMemo.js

@@ -0,0 +1,289 @@
+import { includes, cloneDeep } from 'lodash';
+import findAncestorByType from '/imports/api/creature/computation/engine/findAncestorByType.js';
+
+// The computation memo is an in-memory data structure used only during the
+// computation process
+export default class ComputationMemo {
+  constructor(props, creature){
+    this.statsByVariableName = {};
+    this.constantsByVariableName = {};
+    this.constantsById = {};
+    this.extraStatsByVariableName = {};
+    this.statsById = {};
+    this.originalPropsById = {};
+    this.propsById = {};
+    this.skillsByAbility = {};
+    this.unassignedEffects = [];
+    this.classLevelsById = {};
+    this.classes = {};
+    this.togglesById = {};
+    this.toggleIds = new Set();
+    // Equipped items that might be used as ammo
+    this.equipmentById = {};
+    // Properties that have calculations, but don't impact other properties
+    this.endStepPropsById = {};
+    // First note all the ids of all the toggles
+    props.forEach((prop) => {
+      if (
+        prop.type === 'toggle'
+      ) {
+        this.toggleIds.add(prop._id);
+      }
+    });
+    props.filter((prop) => {
+      if (
+        prop.type === 'toggle'
+      ) {
+        this.addToggle(prop);
+      } else {
+        return true;
+      }
+    }).filter((prop) => {
+      if (
+        prop.type === 'attribute' ||
+        prop.type === 'skill'
+      ) {
+        // Add all the stats
+        this.addStat(prop);
+      } else if (
+        prop.type === 'item'
+      ) {
+        this.addEquipment(prop);
+      } else {
+        return true;
+      }
+    }).forEach((prop) => {
+      // Now add everything else
+      if (prop.type === 'effect'){
+        this.addEffect(prop);
+      } else if (prop.type === 'proficiency') {
+        this.addProficiency(prop);
+      } else if (prop.type === 'classLevel'){
+        this.addClassLevel(prop);
+      } else if (prop.type === 'constant'){
+        this.addConstant(prop);
+      } else {
+        this.addEndStepProp(prop);
+      }
+    });
+    for (let name in creature.denormalizedStats){
+      if (!this.statsByVariableName[name]){
+        this.statsByVariableName[name] = {
+          variableName: name,
+          value: creature.denormalizedStats[name],
+          computationDetails: propDetailsByType.denormalizedStat(),
+        }
+      }
+    }
+  }
+  addConstant(prop){
+    prop = this.registerProperty(prop);
+    this.constantsById[prop._id] = prop;
+  }
+  registerProperty(prop){
+    this.originalPropsById[prop._id] = cloneDeep(prop);
+    this.propsById[prop._id] = prop;
+    prop.dependencies = [];
+    prop.computationDetails = propDetails(prop);
+    prop.ancestors.forEach(ancestor => {
+      if (this.toggleIds.has(ancestor.id)){
+        prop.computationDetails.toggleAncestors.push(ancestor.id);
+      }
+    });
+    return prop;
+  }
+  addToggle(prop){
+    prop = this.registerProperty(prop);
+    this.togglesById[prop._id] = prop;
+  }
+  addClassLevel(prop){
+    prop = this.registerProperty(prop);
+    this.classLevelsById[prop._id] = prop;
+  }
+  addStat(prop){
+    let variableName = prop.variableName;
+    if (!variableName) return;
+    let existingStat = this.statsByVariableName[variableName];
+    prop = this.registerProperty(prop);
+    if (existingStat){
+      existingStat.computationDetails.idsOfSameName.push(prop._id);
+    } else {
+      this.statsById[prop._id] = prop;
+      this.statsByVariableName[variableName] = prop;
+      if (
+        prop.type === 'skill' &&
+        isSkillCheck(prop) &&
+        prop.ability
+      ){
+        this.addSkillToAbility(prop, prop.ability)
+      }
+    }
+  }
+  addSkillToAbility(prop, ability){
+    if (!this.skillsByAbility[ability]){
+      this.skillsByAbility[ability] = [];
+    }
+    this.skillsByAbility[ability].push(prop);
+  }
+  addEffect(prop){
+    prop = this.registerProperty(prop);
+    let targets = this.getEffectTargets(prop);
+    targets.forEach(target => {
+      if (target.computationDetails && target.computationDetails.effects){
+        target.computationDetails.effects.push(prop);
+      }
+    });
+    if (!targets.size){
+      this.unassignedEffects.push(prop);
+    }
+  }
+  getEffectTargets(prop){
+    let targets = new Set();
+    if (!prop.stats) return targets;
+    prop.stats.forEach((statName) => {
+      let target;
+      if (statName[0] === '#'){
+        target = findAncestorByType({
+          type: statName.slice(1),
+          prop,
+          memo: this
+        });
+      } else {
+        target = this.statsByVariableName[statName];
+      }
+      if (!target) return;
+      targets.add(target);
+      if (isSkillOperation(prop) && isAbility(target)){
+        let extras = this.skillsByAbility[statName] || [];
+        extras.forEach(ex =>{
+          // Only pass on ability effects to skills and checks
+          if (ex.skillType === 'skill' || ex.skillType === 'check'){
+            targets.add(ex)
+          }
+        });
+      }
+    });
+    return targets;
+  }
+  addProficiency(prop){
+    prop = this.registerProperty(prop);
+    let targets = this.getProficiencyTargets(prop);
+    targets.forEach(target => {
+      if(target.computationDetails.proficiencies){
+        target.computationDetails.proficiencies.push(prop);
+      }
+    });
+  }
+  getProficiencyTargets(prop){
+    let targets = new Set();
+    if (!prop.stats) return targets;
+    prop.stats.forEach(statName => {
+      let target = this.statsByVariableName[statName];
+      if (!target) return;
+      targets.add(target);
+      if (isAbility(target)) {
+        let extras = this.skillsByAbility[statName] || [];
+        extras.forEach(ex =>{
+          // Only pass on ability proficiencies to skills and checks
+          if (ex.skillType === 'skill' || ex.skillType === 'check'){
+            targets.add(ex)
+          }
+        });
+      }
+    });
+    return targets;
+  }
+  addEquipment(prop){
+    prop = this.registerProperty(prop);
+    this.equipmentById[prop._id] = prop;
+  }
+  addEndStepProp(prop){
+    prop = this.registerProperty(prop);
+    this.endStepPropsById[prop._id] = prop;
+  }
+}
+
+function isAbility(prop){
+  return prop.type === 'attribute' &&
+  prop.attributeType === 'ability'
+}
+
+function isSkillCheck(prop){
+  return includes(['skill', 'check', 'save', 'utility'], prop.skillType);
+}
+
+const skillOperations = [
+  'advantage',
+  'disadvantage',
+  'passiveAdd',
+  'fail',
+  'conditional',
+  'rollBonus',
+];
+
+function isSkillOperation(prop){
+  return skillOperations.includes(prop.operation);
+}
+
+function propDetails(prop){
+  return propDetailsByType[prop.type] && propDetailsByType[prop.type]() ||
+    propDetailsByType.default();
+}
+
+const propDetailsByType = {
+  default(){
+    return {
+      toggleAncestors: [],
+    };
+  },
+  toggle(){
+    return {
+      computed: false,
+      busyComputing: false,
+      toggleAncestors: [],
+    };
+  },
+  attribute(){
+    return {
+      computed: false,
+      busyComputing: false,
+      effects: [],
+      proficiencies: [],
+      toggleAncestors: [],
+      idsOfSameName: [],
+    };
+  },
+  skill(){
+    return {
+      computed: false,
+      busyComputing: false,
+      effects: [],
+      proficiencies: [],
+      toggleAncestors: [],
+      idsOfSameName: [],
+    };
+  },
+  effect(){
+    return {
+      computed: false,
+      busyComputing: false,
+      toggleAncestors: [],
+    };
+  },
+  classLevel(){
+    return {
+      computed: true,
+      toggleAncestors: [],
+    };
+  },
+  proficiency(){
+    return {
+      toggleAncestors: [],
+    };
+  },
+  denormalizedStat(){
+    return {
+      toggleAncestors: [],
+    };
+  }
+}

app/imports/api/creature/computation/engine/EffectAggregator.js

@@ -0,0 +1,78 @@
+export default class EffectAggregator{
+  constructor(){
+    this.base = undefined;
+    this.add = 0;
+    this.mul = 1;
+    this.min = Number.NEGATIVE_INFINITY;
+    this.max = Number.POSITIVE_INFINITY;
+    this.advantage = 0;
+    this.disadvantage = 0;
+    this.passiveAdd = undefined;
+    this.fail = 0;
+    this.set = undefined;
+    this.conditional = [];
+    this.rollBonus = [];
+    this.hasNoEffects = true;
+  }
+  addEffect(effect){
+    let result = effect.result;
+    if (this.hasNoEffects) this.hasNoEffects = false;
+    switch(effect.operation){
+      case 'base':
+        // Take the largest base value
+        if (Number.isFinite(result)){
+          if(Number.isFinite(this.base)){
+            this.base = Math.max(this.base, result);
+          } else {
+            this.base = result;
+          }
+        }
+        break;
+      case 'add':
+        // Add all adds together
+        this.add += result;
+        break;
+      case 'mul':
+        // Multiply the muls together
+        this.mul *= result;
+        break;
+      case 'min':
+        // Take the largest min value
+        this.min = result > this.min ? result : this.min;
+        break;
+      case 'max':
+        // Take the smallest max value
+        this.max = result < this.max ? result : this.max;
+        break;
+      case 'set':
+        // Take the highest set value
+        this.set = this.set === undefined || result > this.set ? result : this.set;
+        break;
+      case 'advantage':
+        // Sum number of advantages
+        this.advantage++;
+        break;
+      case 'disadvantage':
+        // Sum number of disadvantages
+        this.disadvantage++;
+        break;
+      case 'passiveAdd':
+        // Add all passive adds together
+        if (this.passiveAdd === undefined) this.passiveAdd = 0;
+        this.passiveAdd += result;
+        break;
+      case 'fail':
+        // Sum number of fails
+        this.fail++;
+        break;
+      case 'conditional':
+        // Store array of conditionals
+        this.conditional.push(result);
+        break;
+      case 'rollBonus':
+        // Store array of roll bonuses
+        this.rollBonus.push(result);
+        break;
+    }
+  }
+}

app/imports/api/creature/computation/engine/applyToggles.js

@@ -0,0 +1,25 @@
+import computeToggle from '/imports/api/creature/computation/engine/computeToggle.js';
+import { union } from 'lodash';
+
+export default function applyToggles(prop, memo){
+  // If it used to be inactive delete those fields
+  if (prop.inactive) prop.inactive = undefined;
+  if (prop.deactivatedByAncestor) prop.deactivatedByAncestor = undefined;
+  if (prop.deactivatedByToggle) prop.deactivatedByToggle = undefined;
+  // Iterate through the toggle ancestors from oldest to nearest
+  prop.computationDetails.toggleAncestors.forEach(toggleId => {
+    let toggle = memo.togglesById[toggleId];
+    computeToggle(toggle, memo);
+    prop.dependencies = union(
+      prop.dependencies,
+      [toggle._id],
+      toggle.dependencies,
+    );
+    // Deactivate if the toggle is false
+    if (!toggle.toggleResult){
+      prop.inactive = true;
+      prop.deactivatedByAncestor = true;
+      prop.deactivatedByToggle = true;
+    }
+  });
+}

app/imports/api/creature/computation/engine/combineStat.js

@@ -0,0 +1,197 @@
+import computeStat from '/imports/api/creature/computation/engine/computeStat.js';
+import computeProficiency from '/imports/api/creature/computation/engine/computeProficiency.js';
+import evaluateCalculation from '/imports/api/creature/computation/engine/evaluateCalculation.js';
+import stripFloatingPointOddities from '/imports/ui/utility/stripFloatingPointOddities.js';
+import { union } from 'lodash';
+
+export default function combineStat(stat, aggregator, memo){
+  if (stat.type === 'attribute'){
+    combineAttribute(stat, aggregator, memo);
+  } else if (stat.type === 'skill'){
+    combineSkill(stat, aggregator, memo);
+  } else if (stat.type === 'damageMultiplier'){
+    combineDamageMultiplier(stat, memo);
+  }
+}
+
+function getAggregatorResult(stat, aggregator){
+  let base;
+  if (!Number.isFinite(aggregator.base)){
+    base = stat.baseValue || 0;
+  } else if (!Number.isFinite(stat.baseValue)){
+    base = aggregator.base || 0;
+  } else {
+    base = Math.max(aggregator.base, stat.baseValue);
+  }
+  let result = (base + aggregator.add) * aggregator.mul;
+  if (result < aggregator.min) {
+    result = aggregator.min;
+  }
+  if (result > aggregator.max) {
+    result = aggregator.max;
+  }
+  if (aggregator.set !== undefined) {
+    result = aggregator.set;
+  }
+  if (!stat.decimal && Number.isFinite(result)){
+    result = Math.floor(result);
+  } else if (Number.isFinite(result)){
+    result = stripFloatingPointOddities(result);
+  }
+  return result;
+}
+
+function combineAttribute(stat, aggregator, memo){
+  stat.value = getAggregatorResult(stat, aggregator);
+  if (stat.attributeType === 'spellSlot'){
+    let {
+      result,
+      context,
+      dependencies
+    } = evaluateCalculation({
+      string: stat.spellSlotLevelCalculation,
+      memo,
+      prop: stat,
+    });
+    stat.spellSlotLevelValue = result.value;
+    stat.spellSlotLevelErrors = context.errors;
+    stat.dependencies = union(stat.dependencies, dependencies);
+  }
+  stat.currentValue = stat.value - (stat.damage || 0);
+  // Ability scores get modifiers
+  if (stat.attributeType === 'ability') {
+    stat.modifier = Math.floor((stat.currentValue - 10) / 2);
+  } else {
+    stat.modifier = undefined;
+  }
+  // Hit dice get constitution modifiers
+  stat.constitutionMod = undefined;
+  if (stat.attributeType === 'hitDice') {
+    let conStat = memo.statsByVariableName['constitution'];
+    if (conStat && 'modifier' in conStat){
+      stat.constitutionMod = conStat.modifier;
+      stat.dependencies = union(
+        stat.dependencies,
+        [conStat._id],
+        conStat.dependencies,
+      );
+    }
+  }
+  // Stats that have no effects can be hidden based on a sheet setting
+  stat.hide = aggregator.hasNoEffects &&
+    stat.baseValue === undefined ||
+    undefined
+}
+
+function combineSkill(stat, aggregator, memo){
+  // Skills are based on some ability Modifier
+  let ability = stat.ability && memo.statsByVariableName[stat.ability]
+  if (stat.ability && ability){
+    computeStat(ability, memo);
+    stat.abilityMod = ability.modifier;
+    stat.dependencies = union(
+      stat.dependencies,
+      [ability._id],
+      ability.dependencies,
+    );
+  } else {
+    stat.abilityMod = 0;
+  }
+  // Combine all the child proficiencies
+  stat.proficiency = 0;
+  for (let i in stat.computationDetails.proficiencies){
+    let prof = stat.computationDetails.proficiencies[i];
+    computeProficiency(prof, memo);
+    if (
+      !prof.deactivatedByToggle &&
+      prof.value > stat.proficiency
+    ){
+      stat.proficiency = prof.value;
+      stat.dependencies = union(
+        stat.dependencies,
+        [prof._id],
+        prof.dependencies,
+      );
+    }
+  }
+  // Get the character's proficiency bonus to apply
+  let profBonusStat = memo.statsByVariableName['proficiencyBonus'];
+  let profBonus = profBonusStat && profBonusStat.value;
+
+  if (profBonusStat){
+    stat.dependencies = union(
+      stat.dependencies,
+      [profBonusStat._id],
+      profBonusStat.dependencies,
+    );
+  }
+
+  if (typeof profBonus !== 'number' && memo.statsByVariableName['level']){
+    let levelProp = memo.statsByVariableName['level'];
+    let level = levelProp.value;
+    profBonus = Math.ceil(level / 4) + 1;
+    if (levelProp._id){
+      stat.dependencies = union(stat.dependencies, [levelProp._id]);
+    }
+    if (levelProp.dependencies){
+      stat.dependencies = union(stat.dependencies, levelProp.dependencies);
+    }
+  }
+
+  // Multiply the proficiency bonus by the actual proficiency
+  if(stat.proficiency === 0.49){
+    // Round down proficiency bonus in the special case
+    profBonus = Math.floor(profBonus * 0.5);
+  } else {
+    profBonus = Math.ceil(profBonus * stat.proficiency);
+  }
+
+  // Combine everything to get the final result
+  let base = aggregator.base || 0;
+  let result = (base + stat.abilityMod + profBonus + aggregator.add) * aggregator.mul;
+  if (result < aggregator.min) result = aggregator.min;
+  if (result > aggregator.max) result = aggregator.max;
+  if (aggregator.set !== undefined) {
+    result = aggregator.set;
+  }
+  if (Number.isFinite(result)){
+    result = Math.floor(result);
+  }
+  stat.value = result;
+  // Advantage/disadvantage
+  if (aggregator.advantage && !aggregator.disadvantage){
+    stat.advantage = 1;
+  } else if (aggregator.disadvantage && !aggregator.advantage){
+    stat.advantage = -1;
+  } else {
+    stat.advantage = 0;
+  }
+  // Passive bonus
+  stat.passiveBonus = aggregator.passiveAdd;
+  // conditional benefits
+  stat.conditionalBenefits = aggregator.conditional;
+  // Roll bonuses
+  stat.rollBonus = aggregator.rollBonus;
+  // Forced to fail
+  stat.fail = aggregator.fail;
+  // Rollbonus
+  stat.rollBonuses = aggregator.rollBonus;
+  // Hide
+  stat.hide = aggregator.hasNoEffects &&
+    stat.baseValue === undefined &&
+    stat.proficiency == 0 ||
+    undefined;
+}
+
+function combineDamageMultiplier(stat){
+  if (stat.immunityCount) return 0;
+  let result;
+  if (stat.ressistanceCount && !stat.vulnerabilityCount){
+    result = 0.5;
+  }  else if (!stat.ressistanceCount && stat.vulnerabilityCount){
+    result = 2;
+  } else {
+    result = 1;
+  }
+  stat.value = result;
+}

app/imports/api/creature/computation/engine/computeConstant.js

@@ -0,0 +1,12 @@
+import applyToggles from '/imports/api/creature/computation/engine/applyToggles.js';
+
+export default function computeConstant(constant, memo){
+  // Apply any toggles
+  applyToggles(constant, memo);
+  if (constant.deactivatedByToggle) return;
+  if (
+    !memo.constantsByVariableName[constant.variableName]
+  ){
+    memo.constantsByVariableName[constant.variableName] = constant
+  }
+}

app/imports/api/creature/computation/engine/computeEffect.js

@@ -0,0 +1,55 @@
+import evaluateCalculation from '/imports/api/creature/computation/engine/evaluateCalculation.js';
+import applyToggles from '/imports/api/creature/computation/engine/applyToggles.js';
+import { union } from 'lodash';
+
+export default function computeEffect(effect, memo){
+  if (effect.computationDetails.computed) return;
+  if (effect.computationDetails.busyComputing){
+    // Trying to compute this effect again while it is already computing.
+    // We must be in a dependency loop.
+    effect.computationDetails.computed = true;
+    effect.result = NaN;
+    effect.computationDetails.busyComputing = false;
+    effect.computationDetails.error = 'dependencyLoop';
+    if (Meteor.isClient) console.warn('dependencyLoop', effect);
+    return;
+  }
+  // Before doing any work, mark this effect as busy
+  effect.computationDetails.busyComputing = true;
+
+  // Apply any toggles
+  applyToggles(effect, memo);
+
+  // Determine result of effect calculation
+  delete effect.errors;
+  if (!effect.calculation){
+    if(effect.operation === 'add' || effect.operation === 'base'){
+      effect.result = 0;
+    } else {
+      delete effect.result
+    }
+  } else if (Number.isFinite(+effect.calculation)){
+    effect.result = +effect.calculation;
+  } else if(effect.operation === 'conditional' || effect.operation === 'rollBonus'){
+    effect.result = effect.calculation;
+  } else if(_.contains(['advantage', 'disadvantage', 'fail'], effect.operation)){
+    effect.result = 1;
+  } else {
+    let {
+      result,
+      context,
+      dependencies,
+    } = evaluateCalculation({
+      string: effect.calculation,
+      prop: effect,
+      memo
+    });
+    effect.result = result.value;
+    effect.dependencies = union(effect.dependencies, dependencies);
+    if (context.errors.length){
+      effect.errors = context.errors;
+    }
+  }
+  effect.computationDetails.computed = true;
+  effect.computationDetails.busyComputing = false;
+}

app/imports/api/creature/computation/engine/computeEndStepProperty.js

@@ -0,0 +1,129 @@
+import evaluateCalculation from '/imports/api/creature/computation/engine/evaluateCalculation.js';
+import ConstantNode from '/imports/parser/parseTree/ConstantNode.js';
+import applyToggles from '/imports/api/creature/computation/engine/applyToggles.js';
+import { union } from 'lodash';
+
+export default function computeEndStepProperty(prop, memo){
+  applyToggles(prop, memo);
+
+  switch (prop.type){
+    case 'action':
+    case 'spell':
+      computeAction(prop, memo);
+      break;
+    case 'adjustment':
+    case 'damage':
+      computePropertyField(prop, memo, 'amount', 'compile');
+      break;
+    case 'attack':
+      computeAction(prop, memo);
+      computePropertyField(prop, memo, 'rollBonus');
+      break;
+    case 'savingThrow':
+      computePropertyField(prop, memo, 'dc');
+      break;
+    case 'spellList':
+      computePropertyField(prop, memo, 'maxPrepared');
+      computePropertyField(prop, memo, 'attackRollBonus');
+      computePropertyField(prop, memo, 'dc');
+      break;
+    case 'propertySlot':
+      computePropertyField(prop, memo, 'quantityExpected');
+      computePropertyField(prop, memo, 'slotCondition');
+      break;
+    case 'roll':
+      computePropertyField(prop, memo, 'roll', 'compile');
+      break;
+  }
+}
+
+function computeAction(prop, memo){
+  // Uses
+  let {
+    result,
+    context,
+    dependencies,
+  } = evaluateCalculation({ string: prop.uses, prop, memo});
+  prop.usesResult = result.value;
+  prop.dependencies = union(prop.dependencies, dependencies);
+  if (context.errors.length){
+    prop.usesErrors = context.errors;
+  } else {
+    delete prop.usesErrors;
+  }
+  prop.insufficientResources = undefined;
+  if (prop.usesUsed >= prop.usesResult){
+    prop.insufficientResources = true;
+  }
+  if (!prop.resources) return;
+  // Attributes consumed
+  prop.resources.attributesConsumed.forEach((attConsumed, i) => {
+    if (attConsumed.variableName){
+      let stat = memo.statsByVariableName[attConsumed.variableName];
+      prop.resources.attributesConsumed[i].statId = stat && stat._id;
+      prop.resources.attributesConsumed[i].statName = stat && stat.name;
+      let available = stat && stat.currentValue || 0;
+      prop.resources.attributesConsumed[i].available = available;
+      if (available < attConsumed.quantity){
+        prop.insufficientResources = true;
+      }
+      if (stat){
+        prop.dependencies = union(
+          prop.dependencies,
+          [stat._id],
+          stat.dependencies
+        );
+      }
+    }
+  });
+  // Items consumed
+  prop.resources.itemsConsumed.forEach((itemConsumed, i) => {
+    let item = itemConsumed.itemId ?
+      memo.equipmentById[itemConsumed.itemId] :
+      undefined;
+    let available = item ? item.quantity : 0;
+    prop.resources.itemsConsumed[i].available = available;
+    if (!item || available < itemConsumed.quantity){
+      prop.insufficientResources = true;
+    }
+    if (item){
+      prop.resources.itemsConsumed[i].itemId = item._id;
+      let name = item.name;
+      if (item.quantity !== 1 && item.plural){
+        name = item.plural;
+      }
+      if (name) prop.resources.itemsConsumed[i].itemName = name;
+      if (item.icon) prop.resources.itemsConsumed[i].itemIcon = item.icon;
+      if (item.color) prop.resources.itemsConsumed[i].itemColor = item.color;
+      prop.dependencies = union(
+        prop.dependencies,
+        [item._id],
+        item.dependencies
+      );
+    } else {
+      delete prop.resources.itemsConsumed[i].itemId;
+      delete prop.resources.itemsConsumed[i].itemName;
+      delete prop.resources.itemsConsumed[i].itemIcon;
+      delete prop.resources.itemsConsumed[i].itemColor;
+    }
+  });
+}
+
+function computePropertyField(prop, memo, fieldName, fn){
+  let {
+    result,
+    context,
+    dependencies,
+  } = evaluateCalculation({string: prop[fieldName], prop, memo, fn});
+  if (result instanceof ConstantNode){
+    prop[`${fieldName}Result`] = result.value;
+  } else {
+    prop[`${fieldName}Result`] = result.toString();
+  }
+  prop.dependencies = union(prop.dependencies, dependencies);
+  if (context.errors.length){
+    prop[`${fieldName}Errors`] = context.errors;
+  } else {
+    delete prop[`${fieldName}Errors`];
+  }
+}

app/imports/api/creature/computation/engine/computeInlineCalculations.js

@@ -0,0 +1,40 @@
+import evaluateCalculation from '/imports/api/creature/computation/engine/evaluateCalculation.js';
+import INLINE_CALCULATION_REGEX from '/imports/constants/INLINE_CALCULTION_REGEX.js';
+import ErrorNode from '/imports/parser/parseTree/ErrorNode.js';
+import { union } from 'lodash';
+
+export default function computeInlineCalculations(prop, memo){
+  if (prop.summary){
+    computeInlineCalcsForField(prop, memo, 'summary');
+  }
+  if (prop.description){
+    computeInlineCalcsForField(prop, memo, 'description');
+  }
+}
+
+function computeInlineCalcsForField(prop, memo, field){
+  let string = prop[field];
+  let inlineComputations = [];
+  let matches = string.matchAll(INLINE_CALCULATION_REGEX);
+  for (let match of matches){
+    let calculation = match[1];
+    let {
+      result,
+      context,
+      dependencies,
+    } = evaluateCalculation({string: calculation, prop, memo, fn: 'compile'});
+    if (result instanceof ErrorNode){
+      result = '`Calculation Error`';
+    }
+    let computation = {
+      calculation,
+      result: result && result.toString(),
+    };
+    if (context.errors.length){
+      computation.errors = context.errors;
+    }
+    inlineComputations.push(computation);
+    prop.dependencies = union(prop.dependencies, dependencies);
+  }
+  prop[`${field}Calculations`] = inlineComputations;
+}

app/imports/api/creature/computation/engine/computeLevels.js

@@ -0,0 +1,66 @@
+import { forOwn, has, union } from 'lodash';
+import applyToggles from '/imports/api/creature/computation/engine/applyToggles.js';
+
+export default function computeLevels(memo){
+  computeClassLevels(memo);
+  computeTotalLevel(memo);
+}
+
+function computeClassLevels(memo){
+  forOwn(memo.classLevelsById, classLevel => {
+    applyToggles(classLevel, memo);
+    //  class levels are mutually dependent
+    classLevel.dependencies = union(
+      classLevel.dependencies,
+      Object.keys(memo.classLevelsById)
+    );
+    if (classLevel.deactivatedByToggle) return;
+    let name = classLevel.variableName;
+    let stat = memo.statsByVariableName[name];
+    if (!stat){
+      memo.statsByVariableName[name] = classLevel;
+      memo.classes[name] = classLevel;
+    } else if (!has(stat, 'level')){
+      // Stat is overriden by an attribute
+      return;
+    } else if (stat.level < classLevel.level) {
+      memo.statsByVariableName[name] = classLevel;
+      memo.classes[name] = classLevel;
+    }
+  });
+}
+
+function computeTotalLevel(memo){
+  let currentLevel = memo.statsByVariableName['level'];
+  if (!currentLevel || currentLevel.deactivatedByToggle){
+    currentLevel = {
+      value: 0,
+      dependencies: [],
+      computationDetails: {
+        builtIn: true,
+        computed: true,
+      }
+    };
+    memo.statsByVariableName['level'] = currentLevel;
+  }
+  // bail out if overriden by an attribute
+  if (!currentLevel.computationDetails.builtIn) return;
+  let level = 0;
+  for (let name in memo.classes){
+    let cls = memo.classes[name];
+    level += cls.level || 0;
+    if (cls._id){
+      currentLevel.dependencies = union(
+        currentLevel.dependencies,
+        [cls._id]
+      )
+    }
+    if (cls.dependencies){
+      currentLevel.dependencies = union(
+        currentLevel.dependencies,
+        cls.dependencies,
+      )
+    }
+  }
+  currentLevel.value = level;
+}

app/imports/api/creature/computation/engine/computeMemo.js

@@ -0,0 +1,37 @@
+import { each, forOwn } from 'lodash';
+import computeLevels from '/imports/api/creature/computation/engine/computeLevels.js';
+import computeStat from '/imports/api/creature/computation/engine/computeStat.js';
+import computeEffect from '/imports/api/creature/computation/engine/computeEffect.js';
+import computeToggle from '/imports/api/creature/computation/engine/computeToggle.js';
+import computeEndStepProperty from '/imports/api/creature/computation/engine/computeEndStepProperty.js';
+import computeInlineCalculations from '/imports/api/creature/computation/engine/computeInlineCalculations.js';
+import computeConstant from '/imports/api/creature/computation/engine/computeConstant.js';
+
+export default function computeMemo(memo){
+  // Compute level
+  computeLevels(memo);
+  // Compute all constants that could be used
+  forOwn(memo.constantsById, constant => {
+    computeConstant (constant, memo);
+  });
+  // Compute all stats, even if they are overriden
+  forOwn(memo.statsById, stat => {
+    computeStat (stat, memo);
+  });
+  // Compute effects which didn't end up targeting a stat
+  each(memo.unassignedEffects, effect => {
+    computeEffect(effect, memo);
+  });
+  // Compute toggles which didn't already get computed by dependencies
+  forOwn(memo.togglesById, toggle => {
+    computeToggle(toggle, memo);
+  });
+  // Compute end step properties
+  forOwn(memo.endStepPropsById, prop => {
+    computeEndStepProperty(prop, memo);
+  });
+  // Compute inline calculations
+  forOwn(memo.propsById, prop => {
+    computeInlineCalculations(prop, memo);
+  });
+}

app/imports/api/creature/computation/engine/computeProficiency.js

@@ -0,0 +1,23 @@
+import applyToggles from '/imports/api/creature/computation/engine/applyToggles.js';
+
+export default function computeEffect(proficiency, memo){
+  if (proficiency.computationDetails.computed) return;
+  if (proficiency.computationDetails.busyComputing){
+    // Trying to compute this proficiency again while it is already computing.
+    // We must be in a dependency loop.
+    proficiency.computationDetails.computed = true;
+    proficiency.result = NaN;
+    proficiency.computationDetails.busyComputing = false;
+    proficiency.computationDetails.error = 'dependencyLoop';
+    if (Meteor.isClient) console.warn('dependencyLoop', proficiency);
+    return;
+  }
+  // Before doing any work, mark this proficiency as busy
+  proficiency.computationDetails.busyComputing = true;
+
+  // Apply any toggles
+  applyToggles(proficiency, memo);
+
+  proficiency.computationDetails.computed = true;
+  proficiency.computationDetails.busyComputing = false;
+}

app/imports/api/creature/computation/engine/computeStat.js

@@ -0,0 +1,162 @@
+import combineStat from '/imports/api/creature/computation/engine/combineStat.js';
+import computeEffect from '/imports/api/creature/computation/engine/computeEffect.js';
+import EffectAggregator from '/imports/api/creature/computation/engine/EffectAggregator.js';
+import evaluateCalculation from '/imports/api/creature/computation/engine/evaluateCalculation.js';
+import applyToggles from '/imports/api/creature/computation/engine/applyToggles.js';
+import { each, union, without } from 'lodash';
+
+export default function computeStat(stat, memo){
+  // If the stat is already computed, skip it
+  if (stat.computationDetails.computed) return;
+  if (stat.computationDetails.busyComputing){
+    // Trying to compute this stat again while it is already computing.
+    // We must be in a dependency loop.
+    stat.computationDetails.computed = true;
+    stat.value = NaN;
+    stat.computationDetails.busyComputing = false;
+    stat.computationDetails.error = 'dependencyLoop';
+    if (Meteor.isClient) console.warn('dependencyLoop', stat);
+    return;
+  }
+  // Before doing any work, mark this stat as busy
+  stat.computationDetails.busyComputing = true;
+
+  let effects = stat.computationDetails.effects || [];
+  let proficiencies = stat.computationDetails.proficiencies || [];
+
+  // Get references to all the stats that share the variable name
+  let sameNameStats
+
+  if (stat.computationDetails.idsOfSameName){
+    sameNameStats = stat.computationDetails.idsOfSameName.map(
+      id => memo.propsById[id]
+    );
+  } else {
+    sameNameStats = [];
+  }
+
+  let allStats = [stat, ...sameNameStats];
+
+  // Decide which stat is the last active stat
+  // The last active stat is considered the cannonical stat
+  let lastActiveStat;
+  allStats.forEach(candidateStat => {
+    applyToggles(candidateStat, memo);
+    if (!candidateStat.inactive) lastActiveStat = candidateStat;
+    candidateStat.overridden = undefined;
+  });
+  if (!lastActiveStat){
+    delete memo.statsByVariableName[stat.variableName];
+    return;
+  }
+  // Make sure the active stat has all the effects and proficiencies
+  lastActiveStat.computationDetails.effects = effects;
+  lastActiveStat.computationDetails.proficiencies = proficiencies;
+
+  // Update the memo's stat with the chosen stat
+  memo.statsByVariableName[stat.variableName] = lastActiveStat;
+
+  // Recreate list of the non-cannonical stats
+  sameNameStats = without(allStats, lastActiveStat);
+
+  sameNameStats.forEach(statInstance => {
+    // Mark the non-cannonical stats as overridden
+    statInstance.overridden = true;
+
+    // Apply the cannonical damage
+    statInstance.damage = lastActiveStat.damage;
+  });
+
+  let baseDependencies = [];
+  allStats.forEach(statInstance => {
+    // Add this stat and its deps to the dependencies
+    baseDependencies = union(
+      baseDependencies,
+      [statInstance._id],
+      statInstance.dependencies,
+    );
+
+    // Apply all the base proficiencies
+    if (statInstance.baseProficiency && !statInstance.inactive){
+      proficiencies.push({
+        value: statInstance.baseProficiency,
+        stats: [statInstance.variableName],
+        type: 'proficiency',
+        dependencies: statInstance.overridden ?
+          union(statInstance.dependencies, [statInstance._id]) :
+          [],
+        computationDetails: {
+          computed: true,
+        }
+      });
+    }
+
+    // Compute each active stat's baseValue calculation and apply it
+    if (!statInstance.inactive) {
+      delete statInstance.baseValueErrors;
+      let {
+        result,
+        context,
+        dependencies
+      } = evaluateCalculation({
+        string: statInstance.baseValueCalculation,
+        prop: statInstance,
+        memo
+      });
+      result.value = +result.value;
+      if (!isNaN(result.value)){
+        statInstance.baseValue = result.value;
+      } else {
+        statInstance.baseValue = undefined;
+      }
+      statInstance.dependencies = union(statInstance.dependencies, dependencies);
+      if (context.errors.length){
+        statInstance.baseValueErrors = context.errors;
+      }
+      // Apply all the base values
+      if (Number.isFinite(statInstance.baseValue)){
+        effects.push({
+          operation: 'base',
+          calculation: statInstance.baseValueCalculation,
+          result: statInstance.baseValue,
+          stats: [statInstance.variableName],
+          dependencies: statInstance.overridden ?
+          union(statInstance.dependencies, [statInstance._id]) :
+          [],
+          computationDetails: {
+            computed: true,
+          },
+        });
+      }
+    }
+  });
+
+  // Compute and aggregate all the effects
+  let aggregator = new EffectAggregator();
+  let effectDeps = [];
+  each(effects, (effect) => {
+    // Compute
+    computeEffect(effect, memo);
+    if (effect.deactivatedByToggle) return;
+
+    // dependencies
+    if (effect._id) effectDeps = union(effectDeps, [effect._id]);
+    effectDeps = union(effectDeps, effect.dependencies);
+
+    // Add computed effect to aggregator
+    aggregator.addEffect(effect);
+  });
+
+  // Combine the effects into the stats
+  allStats.forEach(statInstance => {
+    // Conglomerate all the effects to compute the final stat values
+    combineStat(statInstance, aggregator, memo);
+    // Mark the stats as computed
+    statInstance.computationDetails.computed = true;
+    statInstance.computationDetails.busyComputing = false;
+    // Only the active stat instance depeneds on the effects
+    if (!statInstance.overridden){
+      statInstance.dependencies = union(statInstance.dependencies, effectDeps);
+    }
+  });
+}

app/imports/api/creature/computation/engine/computeToggle.js

@@ -0,0 +1,55 @@
+import evaluateCalculation from '/imports/api/creature/computation/engine/evaluateCalculation.js';
+import applyToggles from '/imports/api/creature/computation/engine/applyToggles.js';
+import { union } from 'lodash';
+
+export default function computeToggle(toggle, memo){
+  if (toggle.computationDetails.computed) return;
+  if (toggle.computationDetails.busyComputing){
+    // Trying to compute this effect again while it is already computing.
+    // We must be in a dependency loop.
+    toggle.computationDetails.computed = true;
+    toggle.result = false;
+    toggle.computationDetails.busyComputing = false;
+    toggle.computationDetails.error = 'dependencyLoop';
+    if (Meteor.isClient) console.warn('dependencyLoop', toggle);
+    return;
+  }
+  // Before doing any work, mark this toggle as busy
+  toggle.computationDetails.busyComputing = true;
+
+  // Apply any parent toggles
+  applyToggles(toggle, memo);
+
+  // Do work
+  delete toggle.errors;
+  if (toggle.enabled){
+    toggle.toggleResult = true;
+  } else if (toggle.disabled){
+    toggle.toggleResult = false;
+  } else if (!toggle.condition){
+    toggle.toggleResult = false;
+  } else if (Number.isFinite(+toggle.condition)){
+    toggle.toggleResult = !!+toggle.condition;
+  } else {
+    let {
+      result,
+      context,
+      dependencies,
+    } = evaluateCalculation({string: toggle.condition, prop: toggle, memo});
+    toggle.toggleResult = !!result.value;
+    toggle.dependencies = union(
+      toggle.dependencies,
+      dependencies,
+    );
+    if (context.errors.length){
+      toggle.errors = context.errors;
+    }
+  }
+  if (!toggle.toggleResult){
+    toggle.inactive = true;
+    toggle.deactivatedBySelf = true;
+    toggle.deactivatedByToggle = true;
+  }
+  toggle.computationDetails.computed = true;
+  toggle.computationDetails.busyComputing = false;
+}

app/imports/api/creature/computation/engine/evaluateCalculation.js

@@ -0,0 +1,137 @@
+import computeStat from '/imports/api/creature/computation/engine/computeStat.js';
+import { prettifyParseError, parse, CompilationContext } from '/imports/parser/parser.js';
+import SymbolNode from '/imports/parser/parseTree/SymbolNode.js';
+import AccessorNode from '/imports/parser/parseTree/AccessorNode.js';
+import ConstantNode from '/imports/parser/parseTree/ConstantNode.js';
+import ErrorNode from '/imports/parser/parseTree/ErrorNode.js';
+import findAncestorByType from '/imports/api/creature/computation/engine/findAncestorByType.js';
+import { union } from 'lodash';
+
+/* Convert a calculation into a constant output and errors*/
+export default function evaluateCalculation({
+  string,
+  prop,
+  memo,
+  fn = 'reduce',
+}){
+  let dependencies = [];
+  let context = new CompilationContext();
+  if (!string) return {
+    result: new ConstantNode({value: string, type: 'string'}),
+    context,
+    dependencies,
+  };
+  if (typeof string !== 'string'){
+    string = string.toString();
+  }
+  // Parse the string
+  let calc;
+  try {
+    calc = parse(string);
+  } catch (e) {
+    let error = prettifyParseError(e);
+    return {
+      result: new ErrorNode({context, error}),
+      context,
+      dependencies,
+    };
+  }
+
+  // Replace constants with their parsed constant
+  let replaceResults = replaceConstants({
+    calc, memo, prop, dependencies, context
+  });
+  dependencies = replaceResults.dependencies;
+  calc = replaceResults.calc;
+  if (replaceResults.failed){
+    return {
+      result: new ConstantNode({value: string, type: 'string'}),
+      context,
+      dependencies,
+    };
+  }
+
+  // Ensure all symbol nodes are defined and computed
+  dependencies = computeSymbols({calc, memo, prop, dependencies})
+
+  // Evaluate
+  let result = calc[fn](memo.statsByVariableName, context);
+  return {result, context, dependencies};
+}
+
+// Replace constants in the calc with the right ParseNodes
+function replaceConstants({calc, memo, prop, dependencies, context}){
+  let constFailed = [];
+  calc = calc.replaceNodes(node => {
+    if (!(node instanceof SymbolNode)) return;
+    let stat, constant;
+    if (node.name[0] !== '#'){
+      stat = memo.statsByVariableName[node.name]
+      constant = memo.constantsByVariableName[node.name];
+    } else if (node.name === '#constant'){
+      constant = findAncestorByType({type: 'constant', prop, memo});
+    }
+    // replace constants that aren't overridden by stats or disabled by a toggle
+    if (constant && !constant.deactivatedByToggle && !stat){
+      dependencies = union(dependencies, [
+        constant._id,
+        ...constant.dependencies
+      ]);
+      // Fail if the constant has errors
+      if (constant.errors && constant.errors.length){
+        constFailed.push(node.name);
+        return;
+      }
+      let parsedConstantNode;
+      try {
+        parsedConstantNode = parse(constant.calculation);
+      } catch(e){
+        constFailed.push(node.name);
+        return;
+      }
+      if (!parsedConstantNode) constFailed.push(node.name);
+      return parsedConstantNode;
+    }
+  });
+  constFailed.forEach(name => {
+    context.storeError({
+      type: 'error',
+      message: `${name} is a constant property with parsing errors`
+    });
+  });
+  let failed = !!constFailed.length;
+  if (failed){
+    calc = new ErrorNode({error: 'Failed to replace constants'});
+  }
+  return { failed, dependencies, calc };
+}
+
+  // Ensure all symbol nodes are defined and computed
+function computeSymbols({calc, memo, prop, dependencies}){
+  calc.traverse(node => {
+    if (node instanceof SymbolNode || node instanceof AccessorNode){
+      let stat;
+      // References up the tree start with #
+      if (node.name[0] === '#'){
+        stat = findAncestorByType({type: node.name.slice(1), prop, memo});
+        memo.statsByVariableName[node.name] = stat;
+      } else {
+        stat = memo.statsByVariableName[node.name];
+      }
+      if (stat && stat.computationDetails && !stat.computationDetails.computed){
+        computeStat(stat, memo);
+      }
+      if (stat){
+        if (stat.dependencies){
+          dependencies = union(dependencies, [
+            stat._id || node.name,
+            ...stat.dependencies
+          ]);
+        } else {
+          dependencies = union(dependencies, [stat._id || node.name]);
+        }
+      }
+    }
+  });
+  return dependencies;
+}

app/imports/api/creature/computation/engine/findAncestorByType.js

@@ -0,0 +1,10 @@
+export default function findAncestorByType({type, prop, memo}){
+  if (!prop || !prop.ancestors) return;
+  let ancestor;
+  for (let i = prop.ancestors.length - 1; i >= 0; i--){
+    ancestor = memo.propsById[prop.ancestors[i].id];
+    if (ancestor && ancestor.type === type){
+      return ancestor;
+    }
+  }
+}

app/imports/api/creature/computation/engine/getComputationProperties.js

@@ -0,0 +1,24 @@
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+
+export default function getComputationProperties(creatureId){
+  // Find all the relevant properties
+  return CreatureProperties.find({
+    'ancestors.id': creatureId,
+    removed: {$ne: true},
+    $or: [
+      // All active properties
+      {inactive: {$ne: true}},
+      // Unless they were deactivated because of a toggle
+      {deactivatedByToggle: true},
+    ]
+  }, {
+    // Filter out fields never used by calculations
+    fields: {
+      icon: 0,
+    },
+    // Obey tree order
+    sort: {
+      order: 1,
+    }
+  }).fetch();
+}

app/imports/api/creature/computation/engine/getDependentProperties.js

@@ -0,0 +1,51 @@
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { union } from 'lodash';
+
+export default function getDependentProperties({
+  creatureId,
+  propertyIds,
+  propertiesDependedAponIds,
+ }){
+  // find ids of all dependant toggles that have conditions, even if inactive
+  let toggleIds = CreatureProperties.find({
+    'ancestors.id': creatureId,
+    type: 'toggle',
+    removed: {$ne: true},
+    condition: { $exists: true },
+    dependencies: {$in: propertyIds},
+  }, {
+    fields: {_id: 1},
+  }).map(t => t._id);
+  // Find all the dependant properties
+  let props = CreatureProperties.find({
+    'ancestors.id': creatureId,
+    removed: {$ne: true},
+    dependencies: {$in: propertyIds},
+    $or: [
+      // All active properties
+      {inactive: {$ne: true}},
+      // All active and inactive toggles with conditions
+      // Same as {$in: toggleIds}, but should be slightly faster
+      {type: 'toggle', condition: { $exists: true }},
+      // All decendents of the above toggles
+      {'ancestors.id': {$in: toggleIds}},
+    ]
+  }, { fields: {_id: 1, dependencies: 1} }).fetch();
+  // Add all the properties that changing props depend on, but haven't yet been
+  // included to make an array of every property we need
+  let allConnectedPropIds = [...propertyIds, ...propertiesDependedAponIds];
+  props.forEach(prop => {
+    allConnectedPropIds = union(
+      allConnectedPropIds,
+      prop.dependencies,
+      [prop._id]);
+  });
+  // Add on all the properties and the objects they depend apon
+  return CreatureProperties.find({
+    _id: {$in: allConnectedPropIds}
+  }, {
+    // Ignore fields not used in computations
+    fields: {icon: 0},
+    sort: {order: 1},
+  }).fetch();
+}

app/imports/api/creature/computation/engine/writeAlteredProperties.js

@@ -0,0 +1,118 @@
+import { Meteor } from 'meteor/meteor'
+import { isEqual, forOwn } from 'lodash';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import propertySchemasIndex from '/imports/api/properties/computedOnlyPropertySchemasIndex.js';
+
+export default function writeAlteredProperties(memo){
+  let bulkWriteOperations = [];
+  // Loop through all properties on the memo
+  forOwn(memo.propsById, changed => {
+    let schema = propertySchemasIndex[changed.type];
+    if (!schema){
+      console.warn('No schema for ' + changed.type);
+      return;
+    }
+    let id = changed._id;
+    let op = undefined;
+    let original = memo.originalPropsById[id];
+    let keys = [
+      'dependencies',
+      'inactive',
+      'deactivatedBySelf',
+      'deactivatedByAncestor',
+      'deactivatedByToggle',
+      'damage',
+      ...schema.objectKeys(),
+    ];
+    op = addChangedKeysToOp(op, keys, original, changed);
+    if (op){
+      bulkWriteOperations.push(op);
+    }
+  });
+  writePropertiesSequentially(bulkWriteOperations);
+}
+
+function addChangedKeysToOp(op, keys, original, changed) {
+  // Loop through all keys that can be changed by computation
+  // and compile an operation that sets all those keys
+  for (let key of keys){
+    if (!isEqual(original[key], changed[key])){
+      if (!op) op = newOperation(original._id, changed.type);
+      let value = changed[key];
+      if (value === undefined){
+        // Unset values that become undefined
+        addUnsetOp(op, key);
+      } else {
+        // Set values that changed to something else
+        addSetOp(op, key, value);
+      }
+    }
+  }
+  return op;
+}
+
+function newOperation(_id, type){
+  let newOp = {
+    updateOne: {
+      filter: {_id},
+      update: {},
+    }
+  };
+  if (Meteor.isClient){
+    newOp.type = type;
+  }
+  return newOp;
+}
+
+function addSetOp(op, key, value){
+  if (op.updateOne.update.$set){
+    op.updateOne.update.$set[key] = value;
+  } else {
+    op.updateOne.update.$set = {[key]: value};
+  }
+}
+
+function addUnsetOp(op, key){
+  if (op.updateOne.update.$unset){
+    op.updateOne.update.$unset[key] = 1;
+  } else {
+    op.updateOne.update.$unset = {[key]: 1};
+  }
+}
+
+// We use this instead of bulkWriteProperties because it functions with latency
+// compensation without needing to roll back changes, which causes multiple
+// expensive redraws of the character sheet
+function writePropertiesSequentially(bulkWriteOps){
+  bulkWriteOps.forEach(op => {
+    let updateOneOrMany = op.updateOne || op.updateMany;
+    CreatureProperties.update(updateOneOrMany.filter, updateOneOrMany.update, {
+      // The bulk code is bypassing validation, so do the same here
+      // selector: {type: op.type} // include this if bypass is off
+      bypassCollection2: true,
+    });
+  });
+}
+
+// This is more efficient on the database, but significantly less efficient
+// in the UI because of incompatibility with latency compensation. If the
+// duplicate redraws can be fixed, this is a strictly better way of processing
+// writes
+function bulkWriteProperties(bulkWriteOps){
+  if (!bulkWriteOps.length) return;
+  // bulkWrite is only available on the server
+  if (Meteor.isServer){
+    CreatureProperties.rawCollection().bulkWrite(
+      bulkWriteOps,
+      {ordered : false},
+      function(e){
+        if (e) {
+          console.error('Bulk write failed: ');
+          console.error(e);
+        }
+      }
+    );
+  } else {
+    writePropertiesSequentially(bulkWriteOps);
+  }
+}

app/imports/api/creature/computation/engine/writeCreatureVariables.js

@@ -0,0 +1,59 @@
+import { pick, forOwn } from 'lodash';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import VERSION from '/imports/constants/VERSION.js';
+
+export default function writeCreatureVariables(memo, creatureId, fullRecompute = true) {
+  const fields = [
+    'ability',
+    'abilityMod',
+    'advantage',
+    'attributeType',
+    'baseProficiency',
+    'baseValue',
+    'calculation',
+    'conditionalBenefits',
+    'currentValue',
+    'damage',
+    'decimal',
+    'fail',
+    'level',
+    'modifier',
+    'name',
+    'passiveBonus',
+    'proficiency',
+    'reset',
+    'resetMultiplier',
+    'rollBonuses',
+    'skillType',
+    'spellSlotLevelValue',
+    'type',
+    'value',
+  ];
+
+  if (fullRecompute){
+    memo.creatureVariables = {};
+    forOwn(memo.statsByVariableName, (stat, variableName) => {
+      // Don't save context variables
+      if (variableName[0] === '#') return;
+      let condensedStat = pick(stat, fields);
+      memo.creatureVariables[variableName] = condensedStat;
+    });
+    forOwn(memo.constantsByVariableName, (stat, variableName) => {
+      let condensedStat = pick(stat, fields);
+      if (!memo.creatureVariables[variableName]){
+        memo.creatureVariables[variableName] = condensedStat;
+      }
+    });
+    Creatures.update(creatureId, {$set: {
+      variables: memo.creatureVariables,
+      computeVersion: VERSION,
+    }});
+  } else {
+    let $set = {};
+    forOwn(memo.statsByVariableName, (stat, variableName) => {
+      let condensedStat = pick(stat, fields);
+      $set[`variables.${variableName}`] = condensedStat;
+    });
+    Creatures.update(creatureId, {$set});
+  }
+}

app/imports/api/creature/computation/methods/recomputeCreature.js

@@ -0,0 +1,120 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import { assertEditPermission } from '/imports/api/creature/creatures/creaturePermissions.js';
+import ComputationMemo from '/imports/api/creature/computation/engine/ComputationMemo.js';
+import getComputationProperties from '/imports/api/creature/computation/engine/getComputationProperties.js';
+import computeMemo from '/imports/api/creature/computation/engine/computeMemo.js';
+import writeAlteredProperties from '/imports/api/creature/computation/engine/writeAlteredProperties.js';
+import writeCreatureVariables from '/imports/api/creature/computation/engine/writeCreatureVariables.js';
+import { recomputeDamageMultipliersById } from '/imports/api/creature/denormalise/recomputeDamageMultipliers.js';
+import recomputeSlotFullness from '/imports/api/creature/denormalise/recomputeSlotFullness.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import getDependentProperties from '/imports/api/creature/computation/engine/getDependentProperties.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties.js';
+
+export const recomputeCreature = new ValidatedMethod({
+
+  name: 'creatures.recomputeCreature',
+
+  validate: new SimpleSchema({
+    charId: { type: String }
+  }).validator(),
+
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+
+  run({charId}) {
+    let creature = Creatures.findOne(charId);
+    // Permission
+    assertEditPermission(creature, this.userId);
+    // Work, call this direcly if you are already in a method that has checked
+    // for permission to edit a given character
+    recomputeCreatureById(charId);
+  },
+
+});
+
+export function recomputeCreatureById(creatureId){
+  let creature = Creatures.findOne(creatureId);
+  recomputeCreatureByDoc(creature);
+}
+
+/**
+ * This function is the heart of DiceCloud. It recomputes a creature's stats,
+ * distilling down effects and proficiencies into the final stats that make up
+ * a creature.
+ *
+ * Essentially this is a depth first tree traversal algorithm that computes
+ * stats' dependencies before computing stats themselves, while detecting
+ * dependency loops.
+ *
+ * At the moment it makes no effort to limit recomputation to just what was
+ * changed.
+ *
+ * Attempting to implement dependency management to limit recomputation to just
+ * change affected stats should only happen as a last resort, when this function
+ * can no longer be performed more efficiently, and server resources can not be
+ * expanded to meet demand.
+ *
+ * A brief overview:
+ * - Fetch the stats of the creature and add them to
+ *   an object for quick lookup
+ * - Fetch the effects and proficiencies which apply to each stat and store them with the stat
+ * - Fetch the class levels and store them as well
+ * - Mark each stat and effect as uncomputed
+ * - Iterate over each stat in order and compute it
+ *   - If the stat is already computed, skip it
+ *   - If the stat is busy being computed, we are in a dependency loop, make it NaN and mark computed
+ *   - Mark the stat as busy computing
+ *   - Iterate over each effect which applies to the attribute
+ *     - If the effect is not computed compute it
+ *       - If the effect relies on another attribute, get its computed value
+ *       - Recurse if that attribute is uncomputed
+ *     - apply the effect to the attribute
+ *   - Conglomerate all the effects to compute the final stat values
+ *   - Mark the stat as computed
+ * - Write the computed results back to the database
+ */
+export function recomputeCreatureByDoc(creature){
+  const creatureId = creature._id;
+  let props = getComputationProperties(creatureId);
+  let computationMemo = new ComputationMemo(props, creature);
+  computeMemo(computationMemo);
+  writeAlteredProperties(computationMemo);
+  writeCreatureVariables(computationMemo, creatureId);
+  recomputeDamageMultipliersById(creatureId);
+  recomputeSlotFullness(creatureId);
+  return computationMemo;
+}
+
+export function recomputePropertyDependencies(property){
+  let creature = getRootCreatureAncestor(property);
+  recomputeCreatureByDependencies({
+    creature,
+    propertyIds: [property._id],
+    propertiesDependedAponIds: property.dependencies,
+  });
+}
+
+export function recomputeCreatureByDependencies({
+  creature,
+  propertyIds,
+  propertiesDependedAponIds
+}){
+  let props = getDependentProperties({
+    creatureId: creature._id,
+    propertyIds,
+    propertiesDependedAponIds,
+  });
+  let computationMemo = new ComputationMemo(props, creature);
+  computeMemo(computationMemo);
+  writeAlteredProperties(computationMemo);
+  writeCreatureVariables(computationMemo, creature._id, false)
+  recomputeInactiveProperties(creature._id);
+  return computationMemo;
+}

app/imports/api/creature/creatureFolders/CreatureFolders.js

@@ -0,0 +1,39 @@
+import SimpleSchema from 'simpl-schema';
+import STORAGE_LIMITS from '/imports/constants/STORAGE_LIMITS.js';
+
+let CreatureFolders = new Mongo.Collection('creatureFolders');
+
+let creatureFolderSchema = new SimpleSchema({
+	name: {
+		type: String,
+		trim: false,
+		optional: true,
+    max: STORAGE_LIMITS.name,
+	},
+	creatures: {
+		type: Array,
+		defaultValue: [],
+	},
+	'creatures.$': {
+		type: String,
+		regEx: SimpleSchema.RegEx.Id,
+	},
+	owner: {
+		type: String,
+		regEx: SimpleSchema.RegEx.Id,
+    index: 1,
+	},
+  archived: {
+    type: Boolean,
+    optional: true,
+  },
+  order: {
+    type: Number,
+    defaultValue: 0,
+  },
+});
+
+CreatureFolders.attachSchema(creatureFolderSchema);
+
+import '/imports/api/creature/creatureFolders/methods.js/index.js';
+export default CreatureFolders;

app/imports/api/creature/creatureFolders/methods.js/index.js

@@ -0,0 +1,4 @@
+import '/imports/api/creature/creatureFolders/methods.js/insertCreatureFolder.js';
+import '/imports/api/creature/creatureFolders/methods.js/updateCreatureFolderName.js';
+import '/imports/api/creature/creatureFolders/methods.js/removeCreatureFolder.js';
+import '/imports/api/creature/creatureFolders/methods.js/moveCreatureToFolder.js';

app/imports/api/creature/creatureFolders/methods.js/insertCreatureFolder.js

@@ -0,0 +1,46 @@
+import CreatureFolders from '/imports/api/creature/creatureFolders/CreatureFolders.js';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+
+const insertCreatureFolder = new ValidatedMethod({
+  name: 'creatureFolders.methods.insert',
+  validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run() {
+    // Ensure logged in
+    let userId = this.userId;
+    if (!userId) {
+      throw new Meteor.Error('creatureFolders.methods.insert.denied',
+      'You need to be logged in to insert a folder');
+    }
+    // Limit folders to 50 per user
+    let existingFolders = CreatureFolders.find({
+      owner: userId
+    }, {
+      fields: {order: 1},
+      sort: {order :-1}
+    });
+    if (existingFolders.count() >= 50){
+      throw new Meteor.Error('creatureFolders.methods.insert.denied',
+      'You can not have more than 50 folders');
+    }
+    // Make the new folder the last in the order
+    let order = 0;
+    let lastFolder = existingFolders.fetch()[0];
+    if (lastFolder){
+      order = (lastFolder.order || 0) + 1;
+    }
+    // Insert
+    return CreatureFolders.insert({
+      name: 'Folder',
+      owner: userId,
+      order,
+    });
+  },
+});
+
+export default insertCreatureFolder;

app/imports/api/creature/creatureFolders/methods.js/moveCreatureToFolder.js

@@ -0,0 +1,45 @@
+import CreatureFolders from '/imports/api/creature/creatureFolders/CreatureFolders.js';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+
+const moveCreatureToFolder = new ValidatedMethod({
+  name: 'creatureFolders.methods.moveCreatureToFolder',
+  validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({creatureId, folderId}) {
+    // Ensure logged in
+    let userId = this.userId;
+    if (!userId) {
+      throw new Meteor.Error('creatureFolders.methods.updateName.denied',
+      'You need to be logged in to remove a folder');
+    }
+    // Check that this folder is owned by the user
+    if (folderId){
+      let existingFolder = CreatureFolders.findOne(folderId);
+      if (existingFolder.owner !== userId){
+        throw new Meteor.Error('creatureFolders.methods.updateName.denied',
+        'This folder does not belong to you');
+      }
+    }
+    // Remove from other folders
+    CreatureFolders.update({
+      owner: userId
+    }, {
+      $pull: {creatures: creatureId},
+    }, {
+      multi: true,
+    });
+    if (folderId){
+      // Add to this folder
+      CreatureFolders.update(folderId, {
+        $addToSet: {creatures: creatureId},
+      });
+    }
+  },
+});
+
+export default moveCreatureToFolder;

app/imports/api/creature/creatureFolders/methods.js/removeCreatureFolder.js

@@ -0,0 +1,31 @@
+import CreatureFolders from '/imports/api/creature/creatureFolders/CreatureFolders.js';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+
+const removeCreatureFolder = new ValidatedMethod({
+  name: 'creatureFolders.methods.remove',
+  validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({_id}) {
+    // Ensure logged in
+    let userId = this.userId;
+    if (!userId) {
+      throw new Meteor.Error('creatureFolders.methods.updateName.denied',
+      'You need to be logged in to remove a folder');
+    }
+    // Check that this folder is owned by the user
+    let existingFolder = CreatureFolders.findOne(_id);
+    if (existingFolder.owner !== userId){
+      throw new Meteor.Error('creatureFolders.methods.updateName.denied',
+      'This folder does not belong to you');
+    }
+    // Remove
+    return CreatureFolders.remove(_id);
+  },
+});
+
+export default removeCreatureFolder;

app/imports/api/creature/creatureFolders/methods.js/reorderCreatureFolder.js

@@ -0,0 +1,43 @@
+import CreatureFolders from '/imports/api/creature/creatureFolders/CreatureFolders.js';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+
+const reorderCreatureFolder = new ValidatedMethod({
+  name: 'creatureFolders.methods.reorder',
+  validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({_id, order}) {
+    // Ensure logged in
+    let userId = this.userId;
+    if (!userId) {
+      throw new Meteor.Error('creatureFolders.methods.reorder.denied',
+      'You need to be logged in to reorder a folder');
+    }
+    // Check that this folder is owned by the user
+    let existingFolder = CreatureFolders.findOne(_id);
+    if (existingFolder.owner !== userId){
+      throw new Meteor.Error('creatureFolders.methods.reorder.denied',
+      'This folder does not belong to you');
+    }
+    // First give it the new order, it should end in 0.5 putting it between two other docs
+    CreatureFolders.update(_id, {$set: {order}});
+    this.unblock();
+    // Reorder all the folders with integer numbers in this new order
+    CreatureFolders.find({
+      owner: userId
+    }, {
+      fields: {order: 1,},
+      sort: {order: -1}
+    }).forEach((folder, index) => {
+      if (folder.order !== index){
+        CreatureFolders.update(_id, {$set: {order: index}})
+      }
+    });
+  },
+});
+
+export default reorderCreatureFolder;

app/imports/api/creature/creatureFolders/methods.js/updateCreatureFolderName.js

@@ -0,0 +1,31 @@
+import CreatureFolders from '/imports/api/creature/creatureFolders/CreatureFolders.js';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+
+const updateCreatureFolderName = new ValidatedMethod({
+  name: 'creatureFolders.methods.updateName',
+  validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({_id, name}) {
+    // Ensure logged in
+    let userId = this.userId;
+    if (!userId) {
+      throw new Meteor.Error('creatureFolders.methods.updateName.denied',
+      'You need to be logged in to update a folder');
+    }
+    // Check that this folder is owned by the user
+    let existingFolder = CreatureFolders.findOne(_id);
+    if (existingFolder.owner !== userId){
+      throw new Meteor.Error('creatureFolders.methods.updateName.denied',
+      'This folder does not belong to you');
+    }
+    // Update
+    return CreatureFolders.update(_id, {$set: {name}});
+  },
+});
+
+export default updateCreatureFolderName;

app/imports/api/creature/creatureProperties/CreatureProperties.js

@@ -0,0 +1,100 @@
+import { Mongo } from 'meteor/mongo';
+import SimpleSchema from 'simpl-schema';
+import ColorSchema from '/imports/api/properties/subSchemas/ColorSchema.js';
+import ChildSchema from '/imports/api/parenting/ChildSchema.js';
+import SoftRemovableSchema from '/imports/api/parenting/SoftRemovableSchema.js';
+import propertySchemasIndex from '/imports/api/properties/computedPropertySchemasIndex.js';
+import { storedIconsSchema } from '/imports/api/icons/Icons.js';
+import STORAGE_LIMITS from '/imports/constants/STORAGE_LIMITS.js';
+
+let CreatureProperties = new Mongo.Collection('creatureProperties');
+
+let CreaturePropertySchema = new SimpleSchema({
+	type: {
+    type: String,
+    allowedValues: Object.keys(propertySchemasIndex),
+  },
+	tags: {
+		type: Array,
+		defaultValue: [],
+    maxCount: STORAGE_LIMITS.tagCount,
+	},
+	'tags.$': {
+		type: String,
+    max: STORAGE_LIMITS.tagLength,
+	},
+	disabled: {
+		type: Boolean,
+		optional: true,
+	},
+  icon: {
+    type: storedIconsSchema,
+    optional: true,
+    max: STORAGE_LIMITS.icon,
+  },
+  // Reference to the library node that this property was copied from
+  libraryNodeId: {
+    type: String,
+    regEx: SimpleSchema.RegEx.Id,
+    optional: true,
+  },
+  // Denormalised flag if this property is inactive on the sheet for any reason
+  // Including being disabled, or a decendent of a disabled property
+  inactive: {
+    type: Boolean,
+    optional: true,
+    index: 1,
+  },
+  // Denormalised flag if this property was made inactive by an inactive
+  // ancestor. True if this property has an inactive ancestor even if this
+  // property is itself inactive
+  deactivatedByAncestor: {
+    type: Boolean,
+    optional: true,
+    index: 1,
+  },
+  // Denormalised flag if this property was made inactive because of its own
+  // state
+  deactivatedBySelf: {
+    type: Boolean,
+    optional: true,
+    index: 1,
+  },
+  // Denormalised flag if this property was made inactive because of a toggle
+  // calculation. Either an ancestor toggle calculation or its own.
+  deactivatedByToggle: {
+    type: Boolean,
+    optional: true,
+    index: 1,
+  },
+  // Denormalised list of all properties or creatures this property depends on
+  dependencies: {
+    type: Array,
+    defaultValue: [],
+    index: 1,
+  },
+  'dependencies.$': {
+    type: String,
+  },
+});
+
+for (let key in propertySchemasIndex){
+	let schema = new SimpleSchema({});
+	schema.extend(propertySchemasIndex[key]);
+	schema.extend(CreaturePropertySchema);
+  schema.extend(ColorSchema);
+	schema.extend(ChildSchema);
+	schema.extend(SoftRemovableSchema);
+	CreatureProperties.attachSchema(schema, {
+		selector: {type: key}
+	});
+}
+
+import '/imports/api/creature/creatureProperties/methods/index.js';
+import '/imports/api/creature/actions/doAction.js';
+import '/imports/api/creature/actions/castSpellWithSlot.js';
+
+export default CreatureProperties;
+export {
+	CreaturePropertySchema,
+};

app/imports/api/creature/creatureProperties/getRootCreatureAncestor.js

@@ -0,0 +1,5 @@
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+
+export default function getRootCreatureAncestor(property){
+  return Creatures.findOne(property.ancestors[0].id);
+}

app/imports/api/creature/creatureProperties/methods/adjustQuantity.js

@@ -0,0 +1,69 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+
+const adjustQuantity = new ValidatedMethod({
+  name: 'creatureProperties.adjustQuantity',
+  validate: new SimpleSchema({
+    _id: SimpleSchema.RegEx.Id,
+    operation: {
+      type: String,
+      allowedValues: ['set', 'increment']
+    },
+    value: Number,
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({_id, operation, value}) {
+    // Permissions
+		let property = CreatureProperties.findOne(_id);
+    let rootCreature = getRootCreatureAncestor(property);
+		assertEditPermission(rootCreature, this.userId);
+
+    // Do work
+    adjustQuantityWork({property, operation, value});
+
+    // Changing quantity does not change dependencies, but recomputing the
+    // inventory changes many deps at once, so recompute fully
+    recomputeCreatureByDoc(rootCreature);
+    recomputeInventory(rootCreature._id);
+  },
+});
+
+export function adjustQuantityWork({property, operation, value}){
+  // Check if property has quantity
+  let schema = CreatureProperties.simpleSchema(property);
+  if (!schema.allowsKey('quantity')){
+    throw new Meteor.Error(
+      'Adjust quantity failed',
+      `Property of type "${property.type}" doesn't have a quantity`
+    );
+  }
+  if (operation === 'set'){
+    CreatureProperties.update(property._id, {
+      $set: {quantity: value}
+    }, {
+      selector: property
+    });
+  } else if (operation === 'increment'){
+    // value here is 'damage'
+    value = -value;
+    let currentQuantity = property.quantity;
+    if (currentQuantity + value < 0) value = -currentQuantity;
+    CreatureProperties.update(property._id, {
+      $inc: {quantity: value}
+    }, {
+      selector: property
+    });
+  }
+}
+
+export default adjustQuantity;

app/imports/api/creature/creatureProperties/methods/damagePropertiesByName.js

@@ -0,0 +1,57 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import { damagePropertyWork } from '/imports/api/creature/creatureProperties/methods/damageProperty.js';
+import { recomputePropertyDependencies } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+
+const damagePropertiesByName = new ValidatedMethod({
+  name: 'CreatureProperties.damagePropertiesByName',
+  validate: new SimpleSchema({
+    creatureId: SimpleSchema.RegEx.Id,
+    variableName: {
+      type: String,
+    },
+    operation: {
+      type: String,
+      allowedValues: ['set', 'increment']
+    },
+    value: Number,
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 20,
+    timeInterval: 5000,
+  },
+  run({creatureId, variableName, operation, value}) {
+		// Check permissions
+    let creature = Creatures.findOne(creatureId, {
+      fields: {
+        damageMultipliers: 1,
+        owner: 1,
+        readers: 1,
+        writers: 1,
+      },
+    });
+    assertEditPermission(creature, this.userId);
+    let lastProperty;
+    CreatureProperties.find({
+      'ancestors.id': creatureId,
+      variableName,
+      removed: {$ne: false},
+      inactive: {$ne: true},
+    }).forEach(property => {
+      // Check if property can take damage
+      let schema = CreatureProperties.simpleSchema(property);
+      if (!schema.allowsKey('damage')) return;
+      // Damage the property
+      damagePropertyWork({property, operation, value});
+      lastProperty = property;
+    });
+    if (lastProperty) recomputePropertyDependencies(lastProperty);
+  }
+});
+
+export default damagePropertiesByName;

app/imports/api/creature/creatureProperties/methods/damageProperty.js

@@ -0,0 +1,80 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import { recomputePropertyDependencies } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+
+const damageProperty = new ValidatedMethod({
+  name: 'creatureProperties.damage',
+  validate: new SimpleSchema({
+    _id: SimpleSchema.RegEx.Id,
+    operation: {
+      type: String,
+      allowedValues: ['set', 'increment']
+    },
+    value: Number,
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 20,
+    timeInterval: 5000,
+  },
+  run({_id, operation, value}) {
+    // Check permissions
+		let property = CreatureProperties.findOne(_id);
+    if (!property) throw new Meteor.Error(
+      'Damage property failed', 'Property doesn\'t exist'
+    );
+    let rootCreature = getRootCreatureAncestor(property);
+    assertEditPermission(rootCreature, this.userId);
+		// Check if property can take damage
+		let schema = CreatureProperties.simpleSchema(property);
+		if (!schema.allowsKey('damage')){
+			throw new Meteor.Error(
+				'Damage property failed',
+				`Property of type "${property.type}" can't be damaged`
+			);
+		}
+		let result = damagePropertyWork({property, operation, value});
+    // Dependencies can't be changed through damage, only recompute deps
+    recomputePropertyDependencies(property);
+    return result;
+  },
+});
+
+export function damagePropertyWork({property, operation, value}){
+  if (operation === 'set'){
+    let currentValue = property.value;
+    // Set represents what we want the value to be after damage
+    // So we need the actual damage to get to that value
+    let damage = currentValue - value;
+    // Damage can't exceed total value
+    if (damage > currentValue) damage = currentValue;
+    // Damage must be positive
+    if (damage < 0) damage = 0;
+    CreatureProperties.update(property._id, {
+      $set: {damage}
+    }, {
+      selector: property
+    });
+    return currentValue - damage;
+  } else if (operation === 'increment'){
+    let currentValue = property.value - (property.damage || 0);
+    let currentDamage = property.damage;
+    let increment = value;
+    // Can't increase damage above the remaining value
+    if (increment > currentValue) increment = currentValue;
+    // Can't decrease damage below zero
+    if (-increment > currentDamage) increment = -currentDamage;
+    CreatureProperties.update(property._id, {
+      $inc: {damage: increment}
+    }, {
+      selector: property
+    });
+    return increment;
+  }
+}
+
+export default damageProperty;

app/imports/api/creature/creatureProperties/methods/dealDamage.js

@@ -0,0 +1,73 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import { damagePropertyWork } from '/imports/api/creature/creatureProperties/methods/damageProperty.js';
+import { recomputeCreatureByDependencies } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+
+const dealDamage = new ValidatedMethod({
+  name: 'creatureProperties.dealDamage',
+  validate: new SimpleSchema({
+    creatureId: SimpleSchema.RegEx.Id,
+    damageType: {
+      type: String,
+    },
+    amount: Number,
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 20,
+    timeInterval: 5000,
+  },
+  run({creatureId, damageType, amount}) {
+    // permissions
+    let creature = Creatures.findOne(creatureId, {
+      fields: {
+        damageMultipliers: 1,
+        owner: 1,
+        readers: 1,
+        writers: 1,
+      },
+    });
+    assertEditPermission(creature, this.userId);
+
+    // Get all the health bars and do damage to them
+    let healthBars = CreatureProperties.find({
+      'ancestors.id': creatureId,
+      type: 'attribute',
+      attributeType:'healthBar',
+      removed: {$ne: true},
+      inactive: {$ne: true},
+    }, {
+      sort: {order: -1},
+    });
+    let multiplier = creature.damageMultipliers[damageType];
+    if (multiplier === undefined) multiplier = 1;
+    let totalDamage = Math.floor(amount * multiplier);
+    let damageLeft = totalDamage;
+    if (damageType === 'healing') damageLeft = -totalDamage;
+    let propertyIds = [];
+    let propertiesDependedAponIds = [];
+    healthBars.forEach(healthBar => {
+      if (damageLeft === 0) return;
+      let damageAdded = damagePropertyWork({
+        property: healthBar,
+        operation: 'increment',
+        value: damageLeft,
+      });
+      damageLeft -= damageAdded;
+      propertyIds.push(healthBar._id);
+      propertiesDependedAponIds.push(...healthBar.dependencies);
+    });
+    recomputeCreatureByDependencies({
+      creature,
+      propertyIds,
+      propertiesDependedAponIds,
+    });
+    return totalDamage;
+  },
+});
+
+export default dealDamage;

app/imports/api/creature/creatureProperties/methods/duplicateProperty.js

@@ -0,0 +1,105 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import {
+	setLineageOfDocs,
+	renewDocIds
+} from '/imports/api/parenting/parenting.js';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties.js';
+import { reorderDocs } from '/imports/api/parenting/order.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+var snackbar;
+if (Meteor.isClient){
+  snackbar = require(
+    '/imports/ui/components/snackbars/SnackbarQueue.js'
+  ).snackbar
+}
+
+const DUPLICATE_CHILDREN_LIMIT = 50;
+
+const duplicateProperty = new ValidatedMethod({
+  name: 'creatureProperties.duplicate',
+  validate: new SimpleSchema({
+    _id: {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+    }
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({_id}) {
+    let property = CreatureProperties.findOne(_id);
+    let creature = getRootCreatureAncestor(property);
+
+    assertEditPermission(creature, this.userId);
+
+    // Renew the doc ID
+    let randomSrc = DDP.randomStream('duplicateProperty');
+    let propertyId = randomSrc.id();
+    property._id = propertyId;
+
+    // Get all the descendants
+    let nodes = CreatureProperties.find({
+			'ancestors.id': _id,
+			removed: {$ne: true},
+		}, {
+      limit: DUPLICATE_CHILDREN_LIMIT + 1,
+      sort: {order: 1},
+    }).fetch();
+
+    // Alert the user if the limit was hit
+    if (nodes.length > DUPLICATE_CHILDREN_LIMIT){
+      nodes.pop();
+      if (Meteor.isClient){
+        snackbar({
+          text: `Only the first ${DUPLICATE_CHILDREN_LIMIT} children were duplicated`,
+        });
+      }
+    }
+
+    // re-map all the ancestors
+    setLineageOfDocs({
+			docArray: nodes,
+			newAncestry : [
+        ...property.ancestors,
+        {id: propertyId, collection: 'creatureProperties'}
+      ],
+			oldParent : {id: _id, collection: 'creatureProperties'},
+		});
+
+    // Give the docs new IDs without breaking internal references
+    renewDocIds({docArray: nodes});
+
+    // Order the root node
+    property.order += 0.5;
+
+    // Insert the properties
+		CreatureProperties.batchInsert([property, ...nodes]);
+
+    // Tree structure changed by inserts, reorder the tree
+    reorderDocs({
+      collection: CreatureProperties,
+      ancestorId: property.ancestors[0].id,
+    });
+
+    // Inserting the active status of the property needs to be denormalised
+    recomputeInactiveProperties(creature._id);
+
+    // Recompute the inventory
+    recomputeInventory(creature._id);
+
+    // Inserting a creature property invalidates dependencies: full recompute
+    recomputeCreatureByDoc(creature);
+
+    return propertyId;
+  },
+});
+
+export default duplicateProperty;

app/imports/api/creature/creatureProperties/methods/equipItem.js

@@ -0,0 +1,58 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import { organizeDoc } from '/imports/api/parenting/organizeMethods.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+import BUILT_IN_TAGS from '/imports/constants/BUILT_IN_TAGS.js';
+import getParentRefByTag from '/imports/api/creature/creatureProperties/methods/getParentRefByTag.js';
+
+// Equipping or unequipping an item will also change its parent
+const equipItem = new ValidatedMethod({
+  name: 'creatureProperties.equip',
+  validate({_id, equipped}){
+		if (!_id) throw new Meteor.Error('No _id', '_id is required');
+    if (equipped !== true && equipped !== false) {
+      throw new Meteor.Error('No equipped', 'equipped is required to be true or false');
+    }
+  },
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({_id, equipped}) {
+    let item = CreatureProperties.findOne(_id);
+    if (item.type !== 'item') throw new Meteor.Error('wrong type',
+    'Equip and unequip can only be performed on items');
+    let creature = getRootCreatureAncestor(item);
+    assertEditPermission(creature, this.userId);
+    CreatureProperties.update(_id, {
+      $set: {equipped},
+    }, {
+			selector: {type: 'item'},
+		});
+    let tag = equipped ? BUILT_IN_TAGS.equipment : BUILT_IN_TAGS.carried;
+    let parentRef = getParentRefByTag(creature._id, tag);
+    if (!parentRef) parentRef = {id: creature._id, collection: 'creatures'};
+
+    organizeDoc.call({
+      docRef: {
+        id: _id,
+        collection: 'creatureProperties',
+      },
+      parentRef,
+      order: Number.MAX_SAFE_INTEGER,
+      skipRecompute: true,
+    });
+
+    recomputeInactiveProperties(creature._id);
+    recomputeInventory(creature._id);
+    recomputeCreatureByDoc(creature);
+  },
+});
+
+export default equipItem;

app/imports/api/creature/creatureProperties/methods/getParentRefByTag.js

@@ -0,0 +1,13 @@
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+
+export default function getParentRefByTag(creatureId, tag){
+  let prop = CreatureProperties.findOne({
+    'ancestors.id': creatureId,
+    removed: {$ne: true},
+    inactive: {$ne: true},
+    tags: tag,
+  }, {
+    sort: {order: 1},
+  });
+  return prop && {id: prop._id, collection: 'creatureProperties'};
+}

app/imports/api/creature/creatureProperties/methods/getSlotFillFilter.js

@@ -0,0 +1,44 @@
+export default function getSlotFillFilter({slot, libraryIds}){
+  let filter = {
+    removed: {$ne: true},
+    $and: []
+  };
+  if (libraryIds){
+    filter['ancestors.id'] = {$in: libraryIds};
+  }
+  if (slot.slotType){
+    filter.$and.push({
+      $or: [{
+        type: slot.slotType
+      },{
+        type: 'slotFiller',
+        slotFillerType: slot.slotType,
+      }]
+    });
+  }
+  let tagsOr = [];
+  let tagsNor = [];
+  if (slot.slotTags && slot.slotTags.length){
+    tagsOr.push({tags: {$all: slot.slotTags}});
+  }
+  if (slot.extraTags && slot.extraTags.length){
+    slot.extraTags.forEach(extra => {
+      if (!extra.tags || !extra.tags.length) return;
+      if (extra.operation === 'OR'){
+        tagsOr.push({tags: {$all: extra.tags}});
+      } else if (extra.operation === 'NOT'){
+        tagsNor.push({tags: {$all: extra.tags}});
+      }
+    });
+  }
+  if (tagsOr.length){
+    filter.$and.push({$or: tagsOr});
+  }
+  if (tagsNor.length){
+    filter.$and.push({$nor: tagsNor});
+  }
+  if (!filter.$and.length){
+    delete filter.$and;
+  }
+  return filter;
+}

app/imports/api/creature/creatureProperties/methods/index.js

@@ -0,0 +1,14 @@
+import '/imports/api/creature/creatureProperties/methods/adjustQuantity.js';
+import '/imports/api/creature/creatureProperties/methods/damagePropertiesByName.js';
+import '/imports/api/creature/creatureProperties/methods/damageProperty.js';
+import '/imports/api/creature/creatureProperties/methods/dealDamage.js';
+import '/imports/api/creature/creatureProperties/methods/duplicateProperty.js';
+import '/imports/api/creature/creatureProperties/methods/equipItem.js';
+import '/imports/api/creature/creatureProperties/methods/insertProperty.js';
+import '/imports/api/creature/creatureProperties/methods/insertPropertyFromLibraryNode.js';
+import '/imports/api/creature/creatureProperties/methods/pullFromProperty.js';
+import '/imports/api/creature/creatureProperties/methods/pushToProperty.js';
+import '/imports/api/creature/creatureProperties/methods/restoreProperty.js';
+import '/imports/api/creature/creatureProperties/methods/selectAmmoItem.js';
+import '/imports/api/creature/creatureProperties/methods/softRemoveProperty.js';
+import '/imports/api/creature/creatureProperties/methods/updateCreatureProperty.js';

app/imports/api/creature/creatureProperties/methods/insertProperty.js

@@ -0,0 +1,156 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import SimpleSchema from 'simpl-schema';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import { reorderDocs } from '/imports/api/parenting/order.js';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+import { getAncestry } from '/imports/api/parenting/parenting.js';
+import getParentRefByTag from '/imports/api/creature/creatureProperties/methods/getParentRefByTag.js';
+import { RefSchema } from '/imports/api/parenting/ChildSchema.js';
+import { getHighestOrder } from '/imports/api/parenting/order.js';
+
+const insertProperty = new ValidatedMethod({
+  name: 'creatureProperties.insert',
+	validate: new SimpleSchema({
+    creatureProperty: {
+      type: Object,
+      blackbox: true,
+    },
+    parentRef: RefSchema,
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({creatureProperty, parentRef}) {
+    // get the new ancestry for the properties
+		let {parentDoc, ancestors} = getAncestry({parentRef});
+
+		// Check permission to edit
+    let rootCreature;
+		if (parentRef.collection === 'creatures'){
+      rootCreature = parentDoc;
+		} else if (parentRef.collection === 'creatureProperties'){
+      rootCreature = getRootCreatureAncestor(parentDoc);
+		} else {
+			throw `${parentRef.collection} is not a valid parent collection`
+		}
+    assertEditPermission(rootCreature, this.userId);
+
+    creatureProperty.parent = parentRef;
+    creatureProperty.ancestors = ancestors;
+
+		return insertPropertyWork({
+      property: creatureProperty,
+      creature: rootCreature,
+    });
+  },
+});
+
+const insertPropertyAsChildOfTag = new ValidatedMethod({
+  name: 'creatureProperties.insertAsChildOfTag',
+  validate: new SimpleSchema({
+    creatureProperty: {
+      type: Object,
+      blackbox: true,
+    },
+    creatureId: {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+    },
+    tag: {
+      type: String,
+      max: 20,
+    },
+    tagDefaultName: {
+      type: String,
+      max: 20,
+      optional: true,
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({creatureProperty, creatureId, tag, tagDefaultName}) {
+    let parentRef = getParentRefByTag(creatureId, tag);
+
+    if (!parentRef){
+      // Use the creature as the parent and mark that we need to insert the folder first later
+      var insertFolderFirst = true;
+      parentRef = {id: creatureId, collection: 'creatures'};
+    }
+
+    // get the new ancestry for the properties
+		let {parentDoc, ancestors} = getAncestry({parentRef});
+
+    // Check permission to edit
+    let rootCreature;
+		if (parentRef.collection === 'creatures'){
+      rootCreature = parentDoc;
+		} else if (parentRef.collection === 'creatureProperties'){
+      rootCreature = getRootCreatureAncestor(parentDoc);
+		} else {
+			throw `${parentRef.collection} is not a valid parent collection`
+		}
+    assertEditPermission(rootCreature, this.userId);
+
+    // Add the folder first if we need to
+    if (insertFolderFirst){
+      let order = getHighestOrder({
+        collection: CreatureProperties,
+        ancestorId: parentRef.id,
+      }) + 1;
+      let id = CreatureProperties.insert({
+        type: 'folder',
+        name: tagDefaultName || (tag.charAt(0).toUpperCase() + tag.slice(1)),
+        tags: [tag],
+        parent: parentRef,
+        ancestors: [parentRef],
+        order,
+      });
+      // Make the folder our new parent
+      let newParentRef = {id, collection: 'creatureProperties'};
+      ancestors = [parentRef, newParentRef];
+      parentRef = newParentRef;
+      creatureProperty.order = order + 1;
+    }
+
+    creatureProperty.parent = parentRef;
+    creatureProperty.ancestors = ancestors;
+
+		return insertPropertyWork({
+      property: creatureProperty,
+      creature: rootCreature,
+    });
+  },
+});
+
+export function insertPropertyWork({property, creature}){
+  delete property._id;
+  let _id = CreatureProperties.insert(property);
+  // Tree structure changed by insert, reorder the tree
+  reorderDocs({
+    collection: CreatureProperties,
+    ancestorId: creature._id,
+  });
+  // Inserting the active status of the property needs to be denormalised
+  recomputeInactiveProperties(creature._id);
+
+  // Recompute the inventory if it has changed
+  if (property.type === 'item' || property.type === 'container'){
+    recomputeInventory(creature._id);
+  }
+  // Inserting a creature property invalidates dependencies: full recompute
+  recomputeCreatureByDoc(creature);
+  return _id;
+}
+
+export default insertProperty;
+export { insertPropertyAsChildOfTag };

app/imports/api/creature/creatureProperties/methods/insertPropertyFromLibraryNode.js

@@ -0,0 +1,242 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import LibraryNodes from '/imports/api/library/LibraryNodes.js';
+import { RefSchema } from '/imports/api/parenting/ChildSchema.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import {
+	setLineageOfDocs,
+	getAncestry,
+	renewDocIds
+} from '/imports/api/parenting/parenting.js';
+import { reorderDocs } from '/imports/api/parenting/order.js';
+import { setDocToLastOrder } from '/imports/api/parenting/order.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+import fetchDocByRef from '/imports/api/parenting/fetchDocByRef.js';
+
+const insertPropertyFromLibraryNode = new ValidatedMethod({
+	name: 'creatureProperties.insertPropertyFromLibraryNode',
+	validate: new SimpleSchema({
+    nodeIds: {
+      type: Array,
+      max: 20,
+    },
+		'nodeIds.$': {
+			type: String,
+			regEx: SimpleSchema.RegEx.Id,
+		},
+		parentRef: {
+			type: RefSchema,
+		},
+    order: {
+      type: Number,
+      optional: true,
+    },
+	}).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+	run({nodeIds, parentRef, order}) {
+		// get the new ancestry for the properties
+		let {parentDoc, ancestors} = getAncestry({parentRef});
+
+		// Check permission to edit
+    let rootCreature;
+		if (parentRef.collection === 'creatures'){
+      rootCreature = parentDoc;
+		} else if (parentRef.collection === 'creatureProperties'){
+      rootCreature = getRootCreatureAncestor(parentDoc);
+		} else {
+			throw `${parentRef.collection} is not a valid parent collection`
+		}
+    assertEditPermission(rootCreature, this.userId);
+
+    // {libraryId: hasViewPermission}
+    //let libraryPermissionMemoir = {};
+    let node;
+		nodeIds.forEach(nodeId => {
+      // TODO: Check library view permission for each node before starting
+      node = insertPropertyFromNode(nodeId, ancestors, order);
+    });
+
+    // get one of the root inserted docs
+    let rootId = node._id;
+
+    // Tree structure changed by inserts, reorder the tree
+    reorderDocs({
+      collection: CreatureProperties,
+      ancestorId: rootCreature._id,
+    });
+
+    // The library properties need to denormalise which of them are inactive
+    recomputeInactiveProperties(rootCreature._id);
+    // Some of the library properties may be items or containers
+    recomputeInventory(rootCreature._id);
+		// Inserting a creature property invalidates dependencies: full recompute
+    recomputeCreatureByDoc(rootCreature);
+		// Return the docId of the last property, the inserted root property
+		return rootId;
+	},
+});
+
+function insertPropertyFromNode(nodeId, ancestors, order){
+  // Fetch the library node and its decendents, provided they have not been
+  // removed
+  // TODO: Check permission to read the library this node is in
+  let node = LibraryNodes.findOne({
+    _id: nodeId,
+    removed: {$ne: true},
+  });
+  if (!node) throw `Node not found for nodeId: ${nodeId}`;
+  let oldParent = node.parent;
+  let nodes = LibraryNodes.find({
+    'ancestors.id': nodeId,
+    removed: {$ne: true},
+  }).fetch();
+
+  // Convert all references into actual nodes
+  nodes = reifyNodeReferences(nodes);
+
+  // The root node is first in the array of nodes
+  // It must get the first generated ID to prevent flickering
+  nodes = [node, ...nodes];
+
+  // set libraryNodeIds
+  storeLibraryNodeReferences(nodes, nodeId);
+
+  // re-map all the ancestors
+  setLineageOfDocs({
+    docArray: nodes,
+    newAncestry: ancestors,
+    oldParent,
+  });
+
+  // Give the docs new IDs without breaking internal references
+  renewDocIds({
+    docArray: nodes,
+    collectionMap: {'libraryNodes': 'creatureProperties'}
+  });
+
+  // Order the root node
+  if (order === undefined){
+    setDocToLastOrder({
+      collection: CreatureProperties,
+      doc: node,
+    });
+  } else {
+    node.order = order;
+  }
+
+  // Insert the creature properties
+  CreatureProperties.batchInsert(nodes);
+  return node;
+}
+
+
+function storeLibraryNodeReferences(nodes){
+  nodes.forEach(node => {
+    node.libraryNodeId = node._id;
+  });
+}
+
+// Covert node references into actual nodes
+// TODO: check permissions for each library a reference node references
+function reifyNodeReferences(nodes, visitedRefs = new Set(), depth = 0){
+  depth += 1;
+  // New nodes added this function
+  let newNodes = [];
+
+  // Filter out the reference nodes we replace
+  let resultingNodes = nodes.filter(node => {
+
+    // We have already visited this ref and replaced it
+    if (visitedRefs.has(node._id)) return false;
+
+    // Already replaced an ancestor node
+    for (let i; i < node.ancestors.length; i++){
+      if (visitedRefs.has(node.ancestors[i].id)) return false;
+    }
+
+    // This isn't a reference node, continue as normal
+    if (node.type !== 'reference') return true;
+
+    // We have gone too deep, keep the reference node as an error
+    if (depth > 10){
+      if (Meteor.isClient) console.warn('Reference depth limit exceeded');
+      node.cache = {error: 'Reference depth limit exceeded'};
+      return true;
+    }
+
+    let referencedNode
+    try {
+      referencedNode = fetchDocByRef(node.ref);
+      referencedNode.order = node.order;
+      // We are definitely replacing this node, so add it to the list
+      visitedRefs.add(node._id);
+    } catch (e){
+      node.cache = {error: e.reason || e.message || e.toString()};
+      return true;
+    }
+
+    // Get all the descendants of the referenced node
+    let descendents = LibraryNodes.find({
+      'ancestors.id': referencedNode._id,
+      removed: {$ne: true},
+    }, {
+      sort: {order: 1},
+    }).fetch();
+
+    // We are adding the referenced node and its descendants
+    let addedNodes = [referencedNode, ...descendents];
+
+    // re-map all the ancestors to parent the new sub-tree into our existing
+    // node tree
+		setLineageOfDocs({
+			docArray: addedNodes,
+			newAncestry: node.ancestors,
+			oldParent: referencedNode.parent,
+		});
+
+    // Remove all the looped references and descendents from the new nodes
+    // We can't rely on the reify recursion to do this, since the IDs are
+    // getting renewed before it is called
+    addedNodes = addedNodes.filter(node => {
+      // Exclude removed referenced
+      if (visitedRefs.has(node._id)) return false;
+
+      // Exclude descendants of removed references
+      for (let i; i < node.ancestors.length; i++){
+        if (visitedRefs.has(node.ancestors[i].id)) return false;
+      }
+      return true;
+    });
+
+    // TODO: Force the referencedNode to take the old id of the reference
+    // such that the reference's children can be kept
+
+    // Give the new referenced sub-tree new ids
+    renewDocIds({
+      docArray: addedNodes,
+    });
+
+    // Reify the subtree as well with recursion
+    addedNodes = reifyNodeReferences(addedNodes, visitedRefs, depth);
+
+    // Store the new nodes from this inner loop without altering the array
+    // we are looping over
+    newNodes.push(...addedNodes);
+  });
+
+  // We are done filtering the array, we can add the new nodes to it
+  resultingNodes.push(...newNodes);
+
+  return resultingNodes;
+}
+
+export default insertPropertyFromLibraryNode;

app/imports/api/creature/creatureProperties/methods/pullFromProperty.js

@@ -0,0 +1,36 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+
+const pullFromProperty = new ValidatedMethod({
+	name: 'creatureProperties.pull',
+	validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+	run({_id, path, itemId}){
+    // Permissions
+		let property = CreatureProperties.findOne(_id);
+    let rootCreature = getRootCreatureAncestor(property);
+    assertEditPermission(rootCreature, this.userId);
+
+    // Do work
+		CreatureProperties.update(_id, {
+			$pull: {[path.join('.')]: {_id: itemId}},
+		}, {
+			selector: {type: property.type},
+			getAutoValues: false,
+		});
+
+    // TODO figure out if this method can change deps or not
+    recomputeCreatureByDoc(rootCreature);
+    // recomputePropertyDependencies(property);
+	}
+});
+
+export default pullFromProperty;

app/imports/api/creature/creatureProperties/methods/pushToProperty.js

@@ -0,0 +1,53 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import { get } from 'lodash';
+
+const pushToProperty = new ValidatedMethod({
+	name: 'creatureProperties.push',
+	validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+	run({_id, path, value}){
+    // Permissions
+		let property = CreatureProperties.findOne(_id);
+    let rootCreature = getRootCreatureAncestor(property);
+    assertEditPermission(rootCreature, this.userId);
+
+    let joinedPath = path.join('.');
+
+    // Respect maxCount
+    let schema = CreatureProperties.simpleSchema(property);
+    let maxCount = schema.get(joinedPath, 'maxCount');
+
+    if (Number.isFinite(maxCount)){
+      let array = get(property, path);
+      let currentCount = array ? array.length : 0;
+      if (currentCount >= maxCount){
+        throw new Meteor.Error(
+          'Array is full',
+          `Cannot have more than ${maxCount} values`
+        );
+      }
+    }
+
+    // Do work
+		CreatureProperties.update(_id, {
+			$push: {[joinedPath]: value},
+		}, {
+			selector: {type: property.type},
+		});
+
+    // TODO figure out if this method can change deps or not
+    recomputeCreatureByDoc(rootCreature);
+    // recomputePropertyDependencies(property);
+	}
+});
+
+export default pushToProperty;

app/imports/api/creature/creatureProperties/methods/restoreProperty.js

@@ -0,0 +1,40 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import { restore } from '/imports/api/parenting/softRemove.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+
+const restoreProperty = new ValidatedMethod({
+	name: 'creatureProperties.restore',
+	validate: new SimpleSchema({
+		_id: SimpleSchema.RegEx.Id
+	}).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+	run({_id}){
+    // Permissions
+		let property = CreatureProperties.findOne(_id);
+    let rootCreature = getRootCreatureAncestor(property);
+    assertEditPermission(rootCreature, this.userId);
+
+    // Do work
+    restore({_id, collection: CreatureProperties});
+
+    // Items and containers might be restored
+    recomputeInventory(rootCreature._id);
+    // Parents active status may have changed while it was deleted
+    recomputeInactiveProperties(rootCreature._id);
+    // Changes dependency tree by restoring children
+    recomputeCreatureByDoc(rootCreature);
+	}
+});
+
+export default restoreProperty;

app/imports/api/creature/creatureProperties/methods/selectAmmoItem.js

@@ -0,0 +1,52 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+
+const selectAmmoItem = new ValidatedMethod({
+  name: 'creatureProperties.selectAmmoItem',
+  validate: new SimpleSchema({
+    actionId: SimpleSchema.RegEx.Id,
+    itemId: SimpleSchema.RegEx.Id,
+    itemConsumedIndex: Number,
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({actionId, itemId, itemConsumedIndex}) {
+    // Permissions
+		let action = CreatureProperties.findOne(actionId);
+    let rootCreature = getRootCreatureAncestor(action);
+		assertEditPermission(rootCreature, this.userId);
+
+    // Check that this index has a document to edit
+    let itemConsumed = action.resources.itemsConsumed[itemConsumedIndex];
+    if (!itemConsumed){
+      throw new Meteor.Error('Resouce not found',
+        'Could not set ammo, because the ammo document was not found');
+    }
+    let itemToLink = CreatureProperties.findOne(itemId);
+    if (!itemToLink){
+      throw new Meteor.Error('Item not found',
+        'Could not set ammo: the item was not found');
+    }
+    let path = `resources.itemsConsumed.${itemConsumedIndex}.itemId`;
+    CreatureProperties.update(actionId, {
+      $set: {[path]: itemId}
+    }, {
+      selector: action,
+    });
+
+    // Changing the linked item does change the dependency tree
+    // TODO: We can predict exactly which deps will be affected instead of
+    //       recomputing the entire creature
+    recomputeCreatureByDoc(rootCreature);
+  },
+});
+
+export default selectAmmoItem;

app/imports/api/creature/creatureProperties/methods/softRemoveProperty.js

@@ -0,0 +1,37 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import { softRemove } from '/imports/api/parenting/softRemove.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { recomputeCreatureByDoc } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+
+const softRemoveProperty = new ValidatedMethod({
+	name: 'creatureProperties.softRemove',
+	validate: new SimpleSchema({
+		_id: SimpleSchema.RegEx.Id
+	}).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+	run({_id}){
+    // Permissions
+		let property = CreatureProperties.findOne(_id);
+    let rootCreature = getRootCreatureAncestor(property);
+    assertEditPermission(rootCreature, this.userId);
+
+    // Do work
+		softRemove({_id, collection: CreatureProperties});
+
+    // Potentially changes items and containers
+    recomputeInventory(rootCreature._id);
+    // Changes dependency tree by removing children
+    recomputeCreatureByDoc(rootCreature);
+	}
+});
+
+export default softRemoveProperty;

app/imports/api/creature/creatureProperties/methods/updateCreatureProperty.js

@@ -0,0 +1,67 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
+import getRootCreatureAncestor from '/imports/api/creature/creatureProperties/getRootCreatureAncestor.js';
+import { recomputeCreatureById } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+import recomputeInactiveProperties from '/imports/api/creature/denormalise/recomputeInactiveProperties.js';
+import recomputeInventory from '/imports/api/creature/denormalise/recomputeInventory.js';
+
+const updateCreatureProperty = new ValidatedMethod({
+  name: 'creatureProperties.update',
+  validate({_id, path}){
+		if (!_id) throw new Meteor.Error('No _id', '_id is required');
+		// We cannot change these fields with a simple update
+		switch (path[0]){
+			case 'type':
+      case 'order':
+      case 'parent':
+      case 'ancestors':
+			case 'damage':
+				throw new Meteor.Error('Permission denied',
+				'This property can\'t be updated directly');
+		}
+  },
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({_id, path, value}) {
+    // Permission
+    let property = CreatureProperties.findOne(_id, {
+      fields: {type: 1, ancestors: 1}
+    });
+    let rootCreature = getRootCreatureAncestor(property);
+    assertEditPermission(rootCreature, this.userId);
+
+    let pathString = path.join('.');
+    let modifier;
+    // unset empty values
+    if (value === null || value === undefined){
+      modifier = {$unset: {[pathString]: 1}};
+    } else {
+      modifier = {$set: {[pathString]: value}};
+    }
+		CreatureProperties.update(_id, modifier, {
+			selector: {type: property.type},
+		});
+
+    // Some updates might cause other properties to become inactive
+    if ([
+      'applied', 'equipped', 'prepared', 'alwaysPrepared', 'disabled'
+    ].includes(path[0])){
+      recomputeInactiveProperties(rootCreature._id);
+    }
+
+    if (property.type === 'item' || property.type === 'container'){
+      // Potentially changes items and containers
+      recomputeInventory(rootCreature._id);
+    }
+    // Updating a property is likely to change dependencies, do a full recompute
+    // denormalised stats might change, so fetch the creature again
+    recomputeCreatureById(rootCreature._id);
+  },
+});
+
+export default updateCreatureProperty;

app/imports/api/creature/creatureProperties/recomputeCreaturesByProperty.js

@@ -0,0 +1,12 @@
+import { recomputeCreatureById } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+
+/**
+ * Recomputes all ancestor creatures of this property
+ */
+export default function recomputeCreaturesByProperty(property){
+	for (let ref of property.ancestors){
+		if (ref.collection === 'creatures') {
+			recomputeCreatureById.call(ref.id);
+		}
+	}
+}

app/imports/api/creature/creatures/Creatures.js

@@ -0,0 +1,180 @@
+import SimpleSchema from 'simpl-schema';
+import deathSaveSchema from '/imports/api/properties/subSchemas/DeathSavesSchema.js'
+import ColorSchema from '/imports/api/properties/subSchemas/ColorSchema.js';
+import SharingSchema from '/imports/api/sharing/SharingSchema.js';
+import STORAGE_LIMITS from '/imports/constants/STORAGE_LIMITS.js';
+
+//set up the collection for creatures
+let Creatures = new Mongo.Collection('creatures');
+
+let CreatureSettingsSchema = new SimpleSchema({
+	//slowed down by carrying too much?
+	useVariantEncumbrance: {
+		type: Boolean,
+		optional: true,
+	},
+	//hide spellcasting tab
+	hideSpellcasting: {
+		type: Boolean,
+		optional: true,
+	},
+	// Swap around the modifier and stat
+	swapStatAndModifier: {
+		type: Boolean,
+		optional: true,
+	},
+  // Hide all the unused stats
+  hideUnusedStats: {
+    type: Boolean,
+    optional: true,
+  },
+  // Show the tree tab
+  showTreeTab: {
+    type: Boolean,
+    optional: true,
+  },
+  // Hide the spells tab
+  hideSpellsTab: {
+    type: Boolean,
+    optional: true,
+  },
+  // How much each hitDice resets on a long rest
+  hitDiceResetMultiplier: {
+    type: Number,
+    optional: true,
+    min: 0,
+    max: 1,
+  },
+  discordWebhook: {
+    type: String,
+    optional: true,
+    max: STORAGE_LIMITS.url,
+  },
+});
+
+let CreatureSchema = new SimpleSchema({
+	// Strings
+	name: {
+		type: String,
+		defaultValue: '',
+		optional: true,
+    max: STORAGE_LIMITS.name,
+	},
+	alignment: {
+		type: String,
+		optional: true,
+    max: STORAGE_LIMITS.name,
+	},
+	gender: {
+		type: String,
+		optional: true,
+    max: STORAGE_LIMITS.name,
+	},
+	picture: {
+		type: String,
+		optional: true,
+    max: STORAGE_LIMITS.url,
+	},
+  avatarPicture: {
+    type: String,
+    optional: true,
+    max: STORAGE_LIMITS.url,
+  },
+	// Mechanics
+	deathSave: {
+		type: deathSaveSchema,
+		defaultValue: {},
+	},
+  // Stats that are computed and denormalised outside of recomputation
+  denormalizedStats: {
+    type: Object,
+    defaultValue: {},
+  },
+  // Sum of all XP gained by this character
+	'denormalizedStats.xp': {
+		type: SimpleSchema.Integer,
+		defaultValue: 0,
+	},
+  // Sum of all levels granted by milestone XP
+  'denormalizedStats.milestoneLevels': {
+    type: SimpleSchema.Integer,
+    defaultValue: 0,
+  },
+  // Inventory
+	'denormalizedStats.weightTotal': {
+		type: Number,
+		defaultValue: 0,
+	},
+  'denormalizedStats.weightEquipment': {
+		type: Number,
+		defaultValue: 0,
+	},
+  'denormalizedStats.weightCarried': {
+		type: Number,
+		defaultValue: 0,
+	},
+  'denormalizedStats.valueTotal': {
+		type: Number,
+		defaultValue: 0,
+	},
+  'denormalizedStats.valueEquipment': {
+		type: Number,
+		defaultValue: 0,
+	},
+  'denormalizedStats.valueCarried': {
+		type: Number,
+		defaultValue: 0,
+	},
+  'denormalizedStats.itemsAttuned': {
+		type: Number,
+		defaultValue: 0,
+	},
+  // Version of computation engine that was last used to compute this creature
+  computeVersion: {
+		type: String,
+    optional: true,
+	},
+	type: {
+		type: String,
+		defaultValue: 'pc',
+		allowedValues: ['pc', 'npc', 'monster'],
+	},
+  damageMultipliers: {
+    type: Object,
+		blackbox: true,
+		defaultValue: {}
+  },
+	variables: {
+		type: Object,
+		blackbox: true,
+		defaultValue: {}
+	},
+
+  // Tabletop
+  tabletop: {
+    type: String,
+    regEx: SimpleSchema.RegEx.id,
+    optional: true,
+  },
+  initiativeRoll: {
+    type: SimpleSchema.Integer,
+    optional: true,
+  },
+
+	// Settings
+	settings: {
+		type: CreatureSettingsSchema,
+		defaultValue: {},
+	},
+});
+
+CreatureSchema.extend(ColorSchema);
+CreatureSchema.extend(SharingSchema);
+
+Creatures.attachSchema(CreatureSchema);
+
+
+import '/imports/api/creature/creatures/methods/index.js';
+
+export default Creatures;
+export { CreatureSchema };

app/imports/api/creature/creatures/creaturePermissions.js

@@ -0,0 +1,29 @@
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import {
+  assertEditPermission as editPermission,
+  assertViewPermission as viewPermission,
+  assertOwnership as ownership
+} from '/imports/api/sharing/sharingPermissions.js';
+
+function getCreature(creature, fields){
+  if (typeof creature === 'string'){
+    return Creatures.findOne(creature, {fields});
+  } else {
+    return creature;
+  }
+}
+
+export function assertOwnership(creature, userId){
+  creature = getCreature(creature, {owner: 1});
+  ownership(creature, userId);
+}
+
+export function assertEditPermission(creature, userId) {
+  creature = getCreature(creature, {owner: 1, writers: 1});
+  editPermission(creature, userId);
+}
+
+export function assertViewPermission(creature, userId) {
+  creature = getCreature(creature, {owner: 1, readers:1, writers: 1, public: 1});
+  viewPermission(creature, userId);
+}

app/imports/api/creature/creatures/defaultCharacterProperties.js

@@ -0,0 +1,47 @@
+import BUILT_IN_TAGS from '/imports/constants/BUILT_IN_TAGS.js';
+
+export default function defaultCharacterProperties(creatureId){
+  if (!creatureId) throw 'creatureId is required';
+  const creatureRef = {collection: 'creatures', id: creatureId};
+  let randomSrc = DDP.randomStream('defaultProperties');
+  const inventoryId = randomSrc.id();
+  const inventoryRef = {collection: 'creatureProperties', id: inventoryId};
+  return [
+    {
+      type: 'propertySlot',
+      name: 'Ruleset',
+      description: 'Choose a starting point for your character, this will define the basic setup of your character sheet. Without a base, your sheet will be empty.',
+      slotTags: ['base'],
+      tags: [],
+      quantityExpected: 1,
+      hideWhenFull: true,
+      spaceLeft: 1,
+      totalFilled: 0,
+      order: 0,
+      parent: creatureRef,
+      ancestors: [creatureRef],
+    }, {
+      _id: inventoryId,
+      type: 'folder',
+      name: 'Inventory',
+      tags: [BUILT_IN_TAGS.inventory],
+      order: 1,
+      parent: creatureRef,
+      ancestors: [creatureRef],
+    }, {
+      type: 'folder',
+      name: 'Equipment',
+      tags: [BUILT_IN_TAGS.equipment],
+      order: 2,
+      parent: inventoryRef,
+      ancestors: [creatureRef, inventoryRef],
+    }, {
+      type: 'folder',
+      name: 'Carried',
+      tags: [BUILT_IN_TAGS.carried],
+      order: 3,
+      parent: inventoryRef,
+      ancestors: [creatureRef, inventoryRef],
+    },
+  ];
+}

app/imports/api/creature/creatures/getCreatureUrlName.js

@@ -0,0 +1,5 @@
+import getSlug from 'speakingurl';
+
+export default function getCreatureUrlName({name}){
+  return getSlug(name, {maintainCase: true}) || '-';
+}

app/imports/api/creature/creatures/methods/index.js

@@ -0,0 +1,4 @@
+import '/imports/api/creature/creatures/methods/insertCreature.js';
+import '/imports/api/creature/creatures/methods/removeCreature.js';
+import '/imports/api/creature/creatures/methods/restCreature.js';
+import '/imports/api/creature/creatures/methods/updateCreature.js';

app/imports/api/creature/creatures/methods/insertCreature.js

@@ -0,0 +1,70 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { getUserTier } from '/imports/api/users/patreon/tiers.js';
+import defaultCharacterProperties from '/imports/api/creature/creatures/defaultCharacterProperties.js';
+import insertPropertyFromLibraryNode from '/imports/api/creature/creatureProperties/methods/insertPropertyFromLibraryNode.js';
+
+const insertCreature = new ValidatedMethod({
+
+  name: 'creatures.insertCreature',
+
+  validate: null,
+
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+
+  run() {
+    if (!this.userId) {
+      throw new Meteor.Error('Creatures.methods.insert.denied',
+      'You need to be logged in to insert a creature');
+    }
+    let tier = getUserTier(this.userId);
+
+    let currentCharacterCount = Creatures.find({
+      owner: this.userId,
+    }, {
+      fields: {_id: 1},
+    }).count();
+
+    if (
+      tier.characterSlots !== -1 &&
+      currentCharacterCount >= tier.characterSlots
+    ){
+      throw new Meteor.Error('Creatures.methods.insert.denied',
+      `You are already at your limit of ${tier.characterSlots} characters`)
+    }
+
+		// Create the creature document
+    let creatureId = Creatures.insert({
+			owner: this.userId,
+		});
+
+    // Insert the default properties
+    // Not batchInsert because we want the properties cleaned by the schema
+    let baseId;
+    defaultCharacterProperties(creatureId).forEach(prop => {
+      let id = CreatureProperties.insert(prop);
+      if (prop.name === 'Ruleset'){
+        baseId = id;
+      }
+    });
+
+    if (Meteor.isServer){
+      // Insert the 5e ruleset as the default base
+      insertPropertyFromLibraryNode.call({
+        nodeIds: ['iHbhfcg3AL5isSWbw'],
+        parentRef: {id: baseId, collection: 'creatureProperties'},
+        order: 0.5,
+      });
+    }
+
+		return creatureId;
+  },
+});
+
+export default insertCreature;

app/imports/api/creature/creatures/methods/removeCreature.js

@@ -0,0 +1,41 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import { assertOwnership } from '/imports/api/creature/creatures/creaturePermissions.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import CreatureLogs from '/imports/api/creature/log/CreatureLogs.js';
+import Experiences from '/imports/api/creature/experience/Experiences.js';
+
+function removeRelatedDocuments(creatureId){
+  CreatureProperties.remove({'ancestors.id': creatureId});
+  CreatureLogs.remove({creatureId});
+  Experiences.remove({creatureId});
+}
+
+const removeCreature = new ValidatedMethod({
+  name: 'Creatures.methods.removeCreature', // DDP method name
+  validate: new SimpleSchema({
+    charId: {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({charId}) {
+    assertOwnership(charId, this.userId)
+    this.unblock();
+    removeCreatureWork(charId)
+  },
+});
+
+export function removeCreatureWork(creatureId){
+  Creatures.remove(creatureId);
+  removeRelatedDocuments(creatureId);
+}
+
+export default removeCreature;

app/imports/api/creature/creatures/methods/restCreature.js

@@ -0,0 +1,116 @@
+import SimpleSchema from 'simpl-schema';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import { assertEditPermission } from '/imports/api/creature/creatures/creaturePermissions.js';
+import { recomputeCreatureById } from '/imports/api/creature/computation/methods/recomputeCreature.js';
+
+const restCreature = new ValidatedMethod({
+  name: 'creature.methods.longRest',
+  validate: new SimpleSchema({
+    creatureId: {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+    },
+    restType: {
+      type: String,
+      allowedValues: ['shortRest', 'longRest'],
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({creatureId, restType}) {
+    let creature = Creatures.findOne(creatureId, {
+      fields: {
+        owner: 1,
+        writers: 1,
+        settings: 1,
+      }
+    }) ;
+    // Need edit permissions
+    assertEditPermission(creature, this.userId);
+
+    // Long rests reset short rest properties as well
+    let resetFilter;
+    if (restType === 'shortRest'){
+      resetFilter = 'shortRest'
+    } else {
+      resetFilter = {$in: ['shortRest', 'longRest']}
+    }
+    // Only apply to active properties
+    let filter = {
+      'ancestors.id': creatureId,
+      reset: resetFilter,
+      removed: {$ne: true},
+      inactive: {$ne: true},
+    };
+    // update all attribute's damage
+    filter.type = 'attribute';
+    CreatureProperties.update(filter, {
+      $set: {damage: 0}
+    }, {
+      selector: {type: 'attribute'},
+      multi: true,
+    });
+    // Update all action-like properties' usesUsed
+    filter.type = {$in: [
+      'action',
+      'attack',
+      'spell'
+    ]};
+    CreatureProperties.update(filter, {
+      $set: {usesUsed: 0}
+    }, {
+      selector: {type: 'action'},
+      multi: true,
+    });
+    // Reset half hit dice on a long rest, starting with the highest dice
+    if (restType === 'longRest'){
+      let hitDice = CreatureProperties.find({
+        'ancestors.id': creatureId,
+        type: 'attribute',
+        attributeType: 'hitDice',
+        removed: {$ne: true},
+        inactive: {$ne: true},
+      }, {
+        fields: {
+          hitDiceSize: 1,
+          damage: 1,
+          value: 1,
+        }
+      }).fetch();
+      // Use a collator to do sorting in natural order
+      let collator = new Intl.Collator('en', {
+        numeric: true, sensitivity: 'base'
+      });
+      // Get the hit dice in decending order of hitDiceSize
+      let compare = (a, b) => collator.compare(b.hitDiceSize, a.hitDiceSize)
+      hitDice.sort(compare);
+      // Get the total number of hit dice that can be recovered this rest
+      let totalHd = hitDice.reduce((sum, hd) => sum + (hd.value || 0), 0);
+      let resetMultiplier = creature.settings.hitDiceResetMultiplier || 0.5;
+      let recoverableHd = Math.max(Math.floor(totalHd*resetMultiplier), 1);
+      // recover each hit dice in turn until the recoverable amount is used up
+      let amountToRecover, resultingDamage;
+      hitDice.forEach(hd => {
+        if (!recoverableHd) return;
+        amountToRecover = Math.min(recoverableHd, hd.damage || 0);
+        if (!amountToRecover) return;
+        recoverableHd -= amountToRecover;
+        resultingDamage = hd.damage - amountToRecover;
+        CreatureProperties.update(hd._id, {
+          $set: {damage: resultingDamage}
+        }, {
+          selector: {type: 'attribute'},
+        });
+      });
+    }
+    recomputeCreatureById(creatureId);
+  },
+});
+
+export default restCreature;

app/imports/api/creature/creatures/methods/updateCreature.js

@@ -0,0 +1,45 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import {assertEditPermission} from '/imports/api/sharing/sharingPermissions.js';
+
+const updateCreature = new ValidatedMethod({
+  name: 'creatures.update',
+  validate({_id, path}){
+		if (!_id) return false;
+		// Allowed fields
+		let allowedFields = [
+      'name',
+      'alignment',
+      'gender',
+      'picture',
+      'avatarPicture',
+      'color',
+      'settings',
+    ];
+		if (!allowedFields.includes(path[0])){
+			throw new Meteor.Error('Creatures.methods.update.denied',
+      'This field can\'t be updated using this method');
+		}
+  },
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run({_id, path, value}) {
+		let creature = Creatures.findOne(_id);
+    assertEditPermission(creature, this.userId);
+    if (value === undefined || value === null){
+      Creatures.update(_id, {
+        $unset: {[path.join('.')]: 1},
+      });
+    } else {
+      Creatures.update(_id, {
+        $set: {[path.join('.')]: value},
+      });
+    }
+  },
+});
+
+export default updateCreature;

app/imports/api/creature/denormalise/recomputeDamageMultipliers.js

@@ -0,0 +1,78 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import SimpleSchema from 'simpl-schema';
+import { assertEditPermission } from '/imports/api/creature/creatures/creaturePermissions.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+
+export const recomputeDamageMultipliers = new ValidatedMethod({
+
+  name: 'creatures.recomputeDamageMultipliers',
+
+  validate: new SimpleSchema({
+    creatureId: { type: String }
+  }).validator(),
+
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+
+  run({creatureId}) {
+    // Permission
+    assertEditPermission(creatureId, this.userId);
+    // Work, call this direcly if you are already in a method that has checked
+    // for permission to edit a given character
+    recomputeDamageMultipliersById(creatureId);
+  },
+
+});
+
+export function recomputeDamageMultipliersById(creatureId){
+  if (!creatureId) throw 'Creature ID is required';
+  let props = CreatureProperties.find({
+    'ancestors.id': creatureId,
+    type: 'damageMultiplier',
+    removed: {$ne: true},
+    inactive: {$ne: true},
+  }, {
+    sort: {order: 1}
+  });
+
+  // Count of how many weakness, resistances and immunities each damage type has
+  let multipliersByName = {};
+  props.forEach(dm => {
+    dm.damageTypes.forEach(damageType => {
+      if (!multipliersByName[damageType]){
+        multipliersByName[damageType] = {
+          weaknesses: 0,
+          resistances: 0,
+          immunities: 0,
+        };
+      }
+      if (dm.value === 0){
+        multipliersByName[damageType].immunities++;
+      } else if (dm.value === 0.5){
+        multipliersByName[damageType].resistances++;
+      } else if (dm.value === 2){
+        multipliersByName[damageType].weaknesses++;
+      }
+    });
+  });
+  // Make an Object with keys of all the damage types that have a resulting
+  // immunity, weakness, or resistance
+  let damageMultipliers = {};
+  for (let damageType in multipliersByName){
+    let multiplier = multipliersByName[damageType];
+    if (multiplier.immunities){
+      damageMultipliers[damageType] = 0;
+    } else if (multiplier.resistances && !multiplier.weaknesses){
+      damageMultipliers[damageType] = 0.5;
+    } else if (multiplier.weaknesses && !multiplier.resistances){
+      damageMultipliers[damageType] = 2;
+    }
+  }
+  // Store the Object on the creature document
+  Creatures.update(creatureId, {$set: {damageMultipliers}});
+}

app/imports/api/creature/denormalise/recomputeInactiveProperties.js

@@ -0,0 +1,75 @@
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+
+export default function recomputeInactiveProperties(ancestorId){
+  let disabledFilter = {
+    'ancestors.id': ancestorId,
+    $or: [
+      {disabled: true}, // Everything can be disabled
+      {type: 'buff', applied: false}, // Buffs can be applied
+      {type: 'item', equipped: {$ne: true}},
+      {type: 'spell', prepared: {$ne: true}, alwaysPrepared: {$ne: true}},
+    ],
+  };
+  let disabledIds = CreatureProperties.find(disabledFilter, {
+    fields: {_id: 1},
+  }).map(prop => prop._id);
+
+  // Deactivate relevant properties
+  // Inactive properties
+  CreatureProperties.update({
+    'ancestors.id': ancestorId,
+    '_id': {$in: disabledIds},
+    $or: [
+      {inactive: {$ne: true}},
+      {deactivatedBySelf: {$ne: true}},
+      {deactivatedByAncestor: true},
+    ],
+  }, {
+    $set: {
+      inactive: true,
+      deactivatedBySelf: true,
+    },
+    $unset: {deactivatedByAncestor: 1},
+  }, {
+    multi: true,
+    selector: {type: 'any'},
+  });
+  // Decendants of inactive properties
+  CreatureProperties.update({
+    'ancestors.id': {$eq: ancestorId, $in: disabledIds},
+    $or: [
+      {inactive: {$ne: true}},
+      {deactivatedByAncestor: {$ne: true}},
+    ],
+  }, {
+    $set: {
+      inactive: true,
+      deactivatedByAncestor: true,
+    },
+  }, {
+    multi: true,
+    selector: {type: 'any'},
+  });
+
+  // Remove inactive from all the properties that are inactive but shouldn't be
+  CreatureProperties.update({
+    'ancestors.id': {$eq: ancestorId, $nin: disabledIds},
+    '_id': {$nin: disabledIds},
+    // if it was a toggle responsible, we leave it alone
+    deactivatedByToggle: {$ne: true},
+    $or: [
+      {inactive: true},
+      {deactivatedByAncestor: true},
+      {deactivatedBySelf: true}
+    ],
+  }, {
+    $unset: {
+      inactive: 1,
+      deactivatedByAncestor: 1,
+      deactivatedBySelf: 1,
+    },
+  }, {
+    multi: true,
+    selector: {type: 'any'},
+  });
+}

app/imports/api/creature/denormalise/recomputeInventory.js

@@ -0,0 +1,111 @@
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import nodesToTree from '/imports/api/parenting/nodesToTree.js';
+
+export default function recomputeInventory(creatureId){
+  let inventoryForest = nodesToTree({
+    collection: CreatureProperties,
+    ancestorId: creatureId,
+    filter: {
+      type: {$in: ['container', 'item']},
+    },
+    deactivatedByAncestor: {$ne: true},
+  });
+  let containersToWrite = [];
+  let data =  getChildrenInventoryData(inventoryForest, containersToWrite);
+  containersToWrite.forEach(container => {
+    CreatureProperties.update(container._id, {$set: {
+      contentsWeight: container.contentsWeight,
+      contentsValue: container.contentsValue,
+    }}, {selector: {type: 'container'}});
+  });
+  Creatures.update(creatureId, {$set: {
+    'denormalizedStats.weightTotal': data.weightTotal,
+    'denormalizedStats.weightEquipment': data.weightEquipment,
+    'denormalizedStats.weightCarried': data.weightCarried,
+    'denormalizedStats.valueTotal': data.valueTotal,
+    'denormalizedStats.valueEquipment': data.valueEquipment,
+    'denormalizedStats.valueCarried': data.valueCarried,
+    'denormalizedStats.itemsAttuned': data.itemsAttuned,
+  }});
+  return data;
+}
+
+function getChildrenInventoryData(forest, containersToWrite){
+  let data = {
+    weightTotal: 0,
+    weightEquipment: 0,
+    weightCarried: 0,
+    valueTotal: 0,
+    valueEquipment: 0,
+    valueCarried: 0,
+    itemsAttuned: 0,
+  }
+  forest.forEach(tree => {
+    let treeData = getInventoryData(tree, containersToWrite);
+    for (let key in data){
+      data[key] += treeData[key] || 0;
+    }
+  });
+  return data;
+}
+
+function getInventoryData(tree, containersToWrite){
+  let data = {
+    weightTotal: 0,
+    weightEquipment: 0,
+    weightCarried: 0,
+    valueTotal: 0,
+    valueEquipment: 0,
+    valueCarried: 0,
+    itemsAttuned: 0,
+  }
+  let childData = getChildrenInventoryData(tree.children, containersToWrite);
+  let node = tree.node;
+  if (node.type === 'container'){
+    data.weightTotal += node.weight || 0;
+    data.valueTotal += node.value || 0;
+    data.weightCarried += node.weight || 0;
+    data.valueCarried += node.value || 0;
+    storeContentsData(node, childData, containersToWrite);
+  } else if (node.type === 'item'){
+    data.weightTotal += (node.weight * node.quantity) || 0;
+    data.valueTotal += (node.value * node.quantity) || 0;
+    data.weightCarried += (node.weight * node.quantity) || 0;
+    data.valueCarried += (node.value * node.quantity) || 0;
+    if (node.equipped){
+      data.weightEquipment += (node.weight * node.quantity) || 0;
+      data.valueEquipment += (node.value * node.quantity) || 0;
+    }
+    if (node.attuned){
+      data.itemsAttuned += 1;
+    }
+  }
+  for (let key in data){
+    data[key] += childData[key];
+  }
+  if (node.contentsWeightless){
+    data.weightCarried = node.weight;
+  }
+  if (node.carried === false){
+    data.weightCarried = 0;
+    data.valueCarried = 0;
+  }
+  return data
+}
+
+function storeContentsData(node, childData, containersToWrite){
+  let newContentsWeight = childData.weightCarried
+  if (node.contentsWeight !== newContentsWeight){
+    node.contentsWeight = newContentsWeight;
+    node.contentsWeightChanged = true;
+  }
+  let newContentsValue = childData.valueCarried;
+  if (node.contentsValue !== newContentsValue){
+    node.contentsValue = newContentsValue;
+    node.contentsValueChanged = true;
+  }
+  if (node.contentsWeightChanged || node.contentsValueChanged){
+    containersToWrite.push(node);
+  }
+}

app/imports/api/creature/denormalise/recomputeSlotFullness.js

@@ -0,0 +1,43 @@
+import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties.js';
+// n + 1 database queries + n potential updates for n slots. Could be sped up.
+export default function recomputeSlotFullness(ancestorId){
+  CreatureProperties.find({
+    'ancestors.id': ancestorId,
+    type: 'propertySlot',
+  }).forEach(slot => {
+    let children = CreatureProperties.find({
+      'parent.id': slot._id,
+      removed: {$ne: true},
+    }, {
+      fields: {
+        slotQuantityFilled: 1,
+        type: 1
+      }
+    }).fetch();
+    let totalFilled = 0;
+    children.forEach(child => {
+      if (child.type === 'slotFiller'){
+        totalFilled += child.slotQuantityFilled;
+      } else {
+        totalFilled++;
+      }
+    });
+    let spaceLeft;
+    let expected = slot.quantityExpectedResult;
+    if (typeof expected !== 'number'){
+      expected = 1;
+    }
+    if (expected === 0){
+      spaceLeft = null;
+    } else {
+      spaceLeft = expected - totalFilled;
+    }
+    if (slot.totalFilled !== totalFilled || slot.spaceLeft !== spaceLeft){
+      CreatureProperties.update(slot._id, {
+        $set: {totalFilled, spaceLeft},
+      }, {
+        selector: {type: 'propertySlot'}
+      });
+    }
+  });
+}