diff --git a/app/imports/api/users/patreon/updatePatreonDetails.js b/app/imports/api/users/patreon/updatePatreonDetails.js
index 90a83b49..ddd2a377 100644
--- a/app/imports/api/users/patreon/updatePatreonDetails.js
+++ b/app/imports/api/users/patreon/updatePatreonDetails.js
@@ -112,9 +112,9 @@ const writePatreonToken = function(userId, {
   // Write
   Meteor.users.update(userId, {
     $set: {
-      'patreon.accessToken': access_token,
-      'patreon.refreshToken': refresh_token,
-      'patreon.expiresAt': expiryDate,
+      'services.patreon.accessToken': access_token,
+      'services.patreon.refreshToken': refresh_token,
+      'services.patreon.expiresAt': expiryDate,
     },
     $unset: {
       'patreon.error': 1,
diff --git a/app/imports/parser/functions.js b/app/imports/parser/functions.js
index 57378390..c89322ab 100644
--- a/app/imports/parser/functions.js
+++ b/app/imports/parser/functions.js
@@ -80,4 +80,15 @@ export default {
     resultType: 'number',
     fn: Math.trunc,
   },
+  'sign': {
+    comment: 'Returns either a positive or negative 1, indicating the sign of a number, or zero',
+    examples: [
+      {input: 'sign(-3)', result: '-1'},
+      {input: 'sign(3)', result: '1'},
+      {input: 'sign(0)', result: '0'},
+    ],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.sign,
+  }
 }
diff --git a/app/imports/parser/grammar.js b/app/imports/parser/grammar.js
index 289327de..bdd8d245 100644
--- a/app/imports/parser/grammar.js
+++ b/app/imports/parser/grammar.js
@@ -12,6 +12,7 @@ function id(x) { return x[0]; }
   import ParenthesisNode from '/imports/parser/parseTree/ParenthesisNode.js';
   import RollNode from '/imports/parser/parseTree/RollNode.js';
   import SymbolNode from '/imports/parser/parseTree/SymbolNode.js';
+  import UnaryOperatorNode from '/imports/parser/parseTree/UnaryOperatorNode.js';
 
 	import moo from 'moo';
 
@@ -37,7 +38,6 @@ function id(x) { return x[0]; }
     multiplicativeOperator: ['*', '/'],
     exponentOperator: ['^'],
     additiveOperator: ['+', '-'],
-    unaryOperator: ['-'],
     andOperator: ['&', '&&'],
     orOperator: ['|', '||'],
     stringDelimiters: ['\"', '\''],
@@ -79,7 +79,9 @@ let ParserRules = [
     {"name": "singleRollExpression", "symbols": [{"literal":"d"}, "_", "exponentExpression"], "postprocess": d => new RollNode({left: new ConstantNode({value: 1, type: 'number'}), right: d[2]})},
     {"name": "singleRollExpression", "symbols": ["exponentExpression"], "postprocess": id},
     {"name": "exponentExpression", "symbols": ["callExpression", "_", (lexer.has("exponentOperator") ? {type: "exponentOperator"} : exponentOperator), "_", "exponentExpression"], "postprocess": d => operator(d, 'exponent')},
-    {"name": "exponentExpression", "symbols": ["callExpression"], "postprocess": id},
+    {"name": "exponentExpression", "symbols": ["unaryExpression"], "postprocess": id},
+    {"name": "unaryExpression", "symbols": [(lexer.has("additiveOperator") ? {type: "additiveOperator"} : additiveOperator), "_", "unaryExpression"], "postprocess": d => new UnaryOperatorNode({operator: d[0].value, right: d[2]})},
+    {"name": "unaryExpression", "symbols": ["callExpression"], "postprocess": id},
     {"name": "callExpression", "symbols": ["name", "_", "arguments"], "postprocess": 
         d => new CallNode ({functionName: d[0].name, args: d[2]})
           },
diff --git a/app/imports/parser/grammar.ne b/app/imports/parser/grammar.ne
index bac66f8a..a6e52dae 100644
--- a/app/imports/parser/grammar.ne
+++ b/app/imports/parser/grammar.ne
@@ -10,6 +10,7 @@
   import ParenthesisNode from '/imports/parser/parseTree/ParenthesisNode.js';
   import RollNode from '/imports/parser/parseTree/RollNode.js';
   import SymbolNode from '/imports/parser/parseTree/SymbolNode.js';
+  import UnaryOperatorNode from '/imports/parser/parseTree/UnaryOperatorNode.js';
 
 	import moo from 'moo';
 
@@ -35,7 +36,6 @@
     multiplicativeOperator: ['*', '/'],
     exponentOperator: ['^'],
     additiveOperator: ['+', '-'],
-    unaryOperator: ['-'],
     andOperator: ['&', '&&'],
     orOperator: ['|', '||'],
     stringDelimiters: ['\"', '\''],
@@ -101,6 +101,10 @@ singleRollExpression ->
 
 exponentExpression ->
   callExpression _ %exponentOperator _ exponentExpression {% d => operator(d, 'exponent') %}
+| unaryExpression {% id %}
+
+unaryExpression ->
+  %additiveOperator _ unaryExpression {% d => new UnaryOperatorNode({operator: d[0].value, right: d[2]})%}
 | callExpression {% id %}
 
 callExpression ->
diff --git a/app/imports/parser/parseTree/IndexNode.js b/app/imports/parser/parseTree/IndexNode.js
index 592bf8d0..4535c6d6 100644
--- a/app/imports/parser/parseTree/IndexNode.js
+++ b/app/imports/parser/parseTree/IndexNode.js
@@ -12,13 +12,12 @@ export default class IndexNode extends ParseNode {
       let selection = this.array.values[index.value - 1];
       if (selection){
         let result = selection[fn](scope, context);
-        result.inheritDetails([index, this]);
         return result;
       }
     }
     return new IndexNode({
+      index,
       array: this.array[fn](scope, context),
-      index: this.index[fn](scope, context),
       previousNodes: [this],
     });
   }
diff --git a/app/imports/parser/parseTree/OperatorNode.js b/app/imports/parser/parseTree/OperatorNode.js
index 5fee48c4..8d609f41 100644
--- a/app/imports/parser/parseTree/OperatorNode.js
+++ b/app/imports/parser/parseTree/OperatorNode.js
@@ -19,7 +19,6 @@ export default class OperatorNode extends ParseNode {
         right: rightNode,
         operator: this.operator,
         fn: this.fn,
-        previousNodes: [this],
       });
     } else {
       left = leftNode.value;
@@ -48,7 +47,6 @@ export default class OperatorNode extends ParseNode {
     return new ConstantNode({
       value: result,
       type: typeof result,
-      previousNodes: [this, leftNode, rightNode],
     });
   }
   toString(){
diff --git a/app/imports/parser/parseTree/ParenthesisNode.js b/app/imports/parser/parseTree/ParenthesisNode.js
index facca06b..1a99e45a 100644
--- a/app/imports/parser/parseTree/ParenthesisNode.js
+++ b/app/imports/parser/parseTree/ParenthesisNode.js
@@ -9,7 +9,8 @@ export default class ParenthesisNode extends ParseNode {
     let content = this.content[fn](scope, context);
     if (
       content.constructor.name === 'IfNode' ||
-      content.constructor.name === 'OperatorNode'
+      content.constructor.name === 'OperatorNode' ||
+      content.constructor.name === 'RollNode'
     ){
       return new ParenthesisNode({content, previousNodes: [this]});
     } else {
diff --git a/app/imports/parser/parseTree/UnaryOperatorNode.js b/app/imports/parser/parseTree/UnaryOperatorNode.js
new file mode 100644
index 00000000..30844cfe
--- /dev/null
+++ b/app/imports/parser/parseTree/UnaryOperatorNode.js
@@ -0,0 +1,33 @@
+import ParseNode from '/imports/parser/parseTree/ParseNode.js';
+import ConstantNode from '/imports/parser/parseTree/ConstantNode.js';
+
+export default class UnaryOperatorNode extends ParseNode {
+  constructor({operator, right}) {
+		super(...arguments);
+    this.operator = operator;
+    this.right = right;
+  }
+  resolve(fn, scope, context){
+    let rightNode = this.right[fn](scope, context);
+    if (rightNode.type !== 'number'){
+      return new UnaryOperatorNode({
+        operator: this.operator,
+        right: rightNode,
+      });
+    }
+    let right = rightNode.value;
+    let result;
+    switch(this.operator){
+      case '-': result = -right; break;
+      case '+': result = +right; break;
+    }
+    return new ConstantNode({
+      value: result,
+      type: typeof result,
+    });
+  }
+  toString(){
+    let {right, operator} = this;
+    return `${operator}${right.toString()}`;
+  }
+}
diff --git a/app/imports/parser/parser.js b/app/imports/parser/parser.js
index bf174759..3fc568e1 100644
--- a/app/imports/parser/parser.js
+++ b/app/imports/parser/parser.js
@@ -8,7 +8,7 @@ export default function parser(){
 }
 
 export class CompilationContext {
-  constructor({doubleRolls}){
+  constructor({doubleRolls} = {}){
     this.errors = [];
     this.rolls = [];
     this.doubleRolls = doubleRolls;