diff --git a/app/imports/api/creature/actions/doCheck.js b/app/imports/api/creature/actions/doCheck.js
new file mode 100644
index 00000000..f4f2182c
--- /dev/null
+++ b/app/imports/api/creature/actions/doCheck.js
@@ -0,0 +1,40 @@
+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.js';
+import { assertEditPermission } from '/imports/api/creature/creaturePermissions.js';
+import roll from '/imports/parser/roll.js';
+
+const doAction = new ValidatedMethod({
+  name: 'creature.doCheck',
+  validate: new SimpleSchema({
+    actionId: SimpleSchema.RegEx.Id,
+    targetId: {
+      type: String,
+      regEx: SimpleSchema.RegEx.Id,
+      optional: true,
+    },
+  }).validator(),
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 10,
+    timeInterval: 5000,
+  },
+  run({creatureId, attributeName}) {
+    let creature = Creatures.findOne(creatureId);
+    assertEditPermission(creature, this.userId);
+		return doCheckWork({attributeName, creature});
+  },
+});
+
+function doCheckWork({attributeName, creature}){
+  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;
+  //Always roll 2d20 and let the advantage be decided in UI
+  let rolls = roll(2,20);
+  return {rolls, bonus};
+}
+
+export default doAction;
diff --git a/app/imports/parser/parseTree/RollNode.js b/app/imports/parser/parseTree/RollNode.js
index ab3f62e8..d59b900f 100644
--- a/app/imports/parser/parseTree/RollNode.js
+++ b/app/imports/parser/parseTree/RollNode.js
@@ -1,6 +1,7 @@
 import ParseNode from '/imports/parser/parseTree/ParseNode.js';
 import RollArrayNode from '/imports/parser/parseTree/RollArrayNode.js';
 import ErrorNode from '/imports/parser/parseTree/ErrorNode.js';
+import roll from '/imports/parser/roll.js';
 
 export default class RollNode extends ParseNode {
   constructor({left, right}) {
@@ -49,12 +50,7 @@ export default class RollNode extends ParseNode {
       context,
     });
     let diceSize = right.value;
-    let randomSrc = DDP.randomStream('diceRoller');
-    let values = [];
-    for (let i = 0; i < number; i++){
-      let roll = ~~(randomSrc.fraction() * diceSize) + 1
-      values.push(roll);
-    }
+    let values = roll(number, diceSize);
     if (context){
       context.storeRoll({number, diceSize, values});
     }
diff --git a/app/imports/parser/roll.js b/app/imports/parser/roll.js
new file mode 100644
index 00000000..382a4cad
--- /dev/null
+++ b/app/imports/parser/roll.js
@@ -0,0 +1,9 @@
+export default function roll(number, diceSize){
+  let values = [];
+  let randomSrc = DDP.randomStream('diceRoller');
+  for (let i = 0; i < number; i++){
+    let roll = ~~(randomSrc.fraction() * diceSize) + 1
+    values.push(roll);
+  }
+  return values;
+}
diff --git a/app/imports/ui/components/rolls/check.vue b/app/imports/ui/components/rolls/check.vue
new file mode 100644
index 00000000..3abdba55
--- /dev/null
+++ b/app/imports/ui/components/rolls/check.vue
@@ -0,0 +1,9 @@
+<template lang="html" />
+
+<script>
+export default {
+}
+</script>
+
+<style lang="css" scoped>
+</style>
diff --git a/dataSources/.gitignore b/dataSources/.gitignore
new file mode 100644
index 00000000..83ab52dc
--- /dev/null
+++ b/dataSources/.gitignore
@@ -0,0 +1 @@
+Renders