diff --git a/app/imports/api/creature/computation/newEngine/computeComputation/tests/computeConstants.testFn.js b/app/imports/api/creature/computation/newEngine/computeComputation/tests/computeConstants.testFn.js
new file mode 100644
index 00000000..8bf8b91d
--- /dev/null
+++ b/app/imports/api/creature/computation/newEngine/computeComputation/tests/computeConstants.testFn.js
@@ -0,0 +1,28 @@
+import { buildComputationFromProps } from '/imports/api/creature/computation/newEngine/buildCreatureComputation.js';
+import { assert } from 'chai';
+import computeCreatureComputation from '../../computeCreatureComputation.js';
+import clean from '../../utility/cleanProp.testFn.js';
+
+export default function(){
+  const computation = buildComputationFromProps(testProperties);
+  computeCreatureComputation(computation);
+  const prop = id => computation.propsById[id];
+  assert.equal(prop('attId').value, 6);
+}
+
+var testProperties = [
+  clean({
+    _id: 'constId',
+    type: 'constant',
+    variableName: 'arrayConstant',
+    calculation: '[2, 4, 6, 8, 10]',
+  }),
+  clean({
+    _id: 'attId',
+    type: 'attribute',
+    baseValue: {
+      calculation: 'arrayConstant[3]',
+    },
+    ancestors: [{id: 'charId'}],
+  }),
+];
diff --git a/app/imports/api/creature/computation/newEngine/computeComputation/tests/index.js b/app/imports/api/creature/computation/newEngine/computeComputation/tests/index.js
index 1ab60e82..490272e0 100644
--- a/app/imports/api/creature/computation/newEngine/computeComputation/tests/index.js
+++ b/app/imports/api/creature/computation/newEngine/computeComputation/tests/index.js
@@ -1,6 +1,7 @@
 import computeAction from './computeAction.testFn.js';
 import computeAttribute from './computeAttribute.testFn.js';
 import computeClasses from './computeClasses.testFn.js';
+import computeConstants from './computeConstants.testFn.js';
 
 export default [{
   text: 'Computes actions',
@@ -11,4 +12,7 @@ export default [{
 },{
   text: 'Computes classes',
   fn: computeClasses,
+},{
+  text: 'Computes constants',
+  fn: computeConstants,
 }];
diff --git a/app/imports/parser/parseTree/SymbolNode.js b/app/imports/parser/parseTree/SymbolNode.js
index 8f5e4bb9..814ea261 100644
--- a/app/imports/parser/parseTree/SymbolNode.js
+++ b/app/imports/parser/parseTree/SymbolNode.js
@@ -9,18 +9,22 @@ export default class SymbolNode extends ParseNode {
   toString(){
     return `${this.name}`
   }
-  compile(scope, context){
+  compile(scope, context, calledFromReduce = false){
     let value = scope && scope[this.name];
     let type = typeof value;
-    // For parse nodes, compile and return
-    if (value instanceof ParseNode){
-      return value.compile(scope, context);
-    }
     // For objects, default to their .value
     if (type === 'object'){
       value = value.value;
       type = typeof value;
     }
+    // For parse nodes, compile and return
+    if (value instanceof ParseNode){
+      if (calledFromReduce){
+        return value.reduce(scope, context);
+      } else {
+        return value.compile(scope, context);
+      }
+    }
     if (type === 'string' || type === 'number' || type === 'boolean'){
       return new ConstantNode({value, type});
     } else if (type === 'undefined'){
@@ -32,7 +36,7 @@ export default class SymbolNode extends ParseNode {
     }
   }
   reduce(scope, context){
-    let result = this.compile(scope);
+    let result = this.compile(scope, context, true);
     if (result instanceof SymbolNode){
       if (context) context.storeError({
         type: 'info',