diff --git a/app/imports/api/engine/action/functions/InputProvider.ts b/app/imports/api/engine/action/functions/InputProvider.ts
index 90923766..51244a25 100644
--- a/app/imports/api/engine/action/functions/InputProvider.ts
+++ b/app/imports/api/engine/action/functions/InputProvider.ts
@@ -1,4 +1,10 @@
+import Task from '/imports/api/engine/action/tasks/Task';
+
 type InputProvider = {
+  /**
+   * Show the user the next property or task to apply and wait for input to continue
+   */
+  nextStep?(task: Task): Promise<void>;
   /**
    * Roll dice
    * @param dice How many dice
@@ -20,7 +26,23 @@ type InputProvider = {
   /**
    * Get advantage, natural, or disadvantage for a d20 roll
    */
-  advantage(suggestedAdvantage: 0 | 1 | -1): Promise<0 | 1 | -1>;
+  advantage(suggestedAdvantage: Advantage): Promise<Advantage>;
+  /**
+   * Get the details of a check or save
+   */
+  check(suggestedParams: CheckParams): Promise<CheckParams>;
 }
 
-export default InputProvider;
\ No newline at end of file
+export type Advantage = 0 | 1 | -1;
+
+export type CheckParams = {
+  advantage: Advantage;
+  skillVariableName: string;
+  abilityVariableName: string;
+  dc: number | null;
+  contest?: true;
+  targetSkillVariableName?: string;
+  targetAbilityVariableName?: string;
+}
+
+export default InputProvider;
diff --git a/app/imports/api/engine/action/functions/applyAction.ts b/app/imports/api/engine/action/functions/applyAction.ts
index e28bf562..0e00d547 100644
--- a/app/imports/api/engine/action/functions/applyAction.ts
+++ b/app/imports/api/engine/action/functions/applyAction.ts
@@ -20,6 +20,7 @@ export default async function applyAction(action: EngineAction, userInput: Input
   action._stepThrough = stepThrough;
   action._isSimulation = simulate;
   action.taskCount = 0;
+  console.log(JSON.stringify(action, null, 2));
   const prop = await getSingleProperty(action.creatureId, action.rootPropId);
   if (!prop) throw new Meteor.Error('Not found', 'Root action property could not be found');
   await applyTask(action, {
diff --git a/app/imports/api/engine/action/methods/index.ts b/app/imports/api/engine/action/methods/index.ts
new file mode 100644
index 00000000..d498cbc4
--- /dev/null
+++ b/app/imports/api/engine/action/methods/index.ts
@@ -0,0 +1,3 @@
+import './insertAction';
+import './runAction';
+import './updateAction';
diff --git a/app/imports/api/engine/action/methods/insertAction.ts b/app/imports/api/engine/action/methods/insertAction.ts
index 1c85f4a6..ac0f0881 100644
--- a/app/imports/api/engine/action/methods/insertAction.ts
+++ b/app/imports/api/engine/action/methods/insertAction.ts
@@ -4,7 +4,7 @@ import EngineActions, { EngineAction, ActionSchema } from '/imports/api/engine/a
 import { assertEditPermission } from '/imports/api/sharing/sharingPermissions';
 import { getCreature } from '/imports/api/engine/loadCreatures';
 
-export const insertAction: ValidatedMethod = new ValidatedMethod({
+export const insertAction = new ValidatedMethod({
   name: 'actions.insertAction',
   validate: new SimpleSchema({
     action: ActionSchema
@@ -16,6 +16,6 @@ export const insertAction: ValidatedMethod = new ValidatedMethod({
     EngineActions.removeAsync({ creatureId: action.creatureId });
     // Force a random id even if one was provided, we may use it later as the seed for PRNG
     delete action._id;
-    return await EngineActions.insertAsync(action);
+    return EngineActions.insertAsync(action);
   },
 });
diff --git a/app/imports/api/engine/action/methods/updateAction.ts b/app/imports/api/engine/action/methods/updateAction.ts
new file mode 100644
index 00000000..cdb4998d
--- /dev/null
+++ b/app/imports/api/engine/action/methods/updateAction.ts
@@ -0,0 +1,22 @@
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import EngineActions from '/imports/api/engine/action/EngineActions';
+import { assertEditPermission } from '/imports/api/sharing/sharingPermissions';
+import { getCreature } from '/imports/api/engine/loadCreatures';
+
+export const updateAction = new ValidatedMethod({
+  name: 'actions.updateAction',
+  validate({ _id, path, value }) {
+    if (!_id) throw new Meteor.Error('No _id', '_id is required');
+    // We cannot change these fields with a simple update
+    if (path !== 'targetIds') throw new Meteor.Error('Can only update target ids');
+    if (!Array.isArray(value)) throw new Meteor.Error('TargetIds must be an array');
+  },
+  run: async function ({ _id, path, value }: { _id: string, path: 'targetIds', value: string[] }) {
+    const action = await EngineActions.findOneAsync(_id);
+    if (!action) {
+      throw new Meteor.Error('not found', 'The given action was not found');
+    }
+    assertEditPermission(getCreature(action.creatureId), this.userId);
+    return EngineActions.updateAsync(_id, { $set: { [path]: value } });
+  },
+});
diff --git a/app/imports/api/engine/action/tasks/applyCheckTask.ts b/app/imports/api/engine/action/tasks/applyCheckTask.ts
new file mode 100644
index 00000000..e7fab1af
--- /dev/null
+++ b/app/imports/api/engine/action/tasks/applyCheckTask.ts
@@ -0,0 +1,50 @@
+import { getFromScope } from '/imports/api/creature/creatures/CreatureVariables';
+import { EngineAction } from '/imports/api/engine/action/EngineActions';
+import InputProvider, { CheckParams } from '/imports/api/engine/action/functions/InputProvider';
+import { applyDefaultAfterPropTasks } from '/imports/api/engine/action/functions/applyTaskGroups';
+import { getEffectiveActionScope } from '/imports/api/engine/action/functions/getEffectiveActionScope';
+import recalculateCalculation from '/imports/api/engine/action/functions/recalculateCalculation';
+import { applyUnresolvedEffects } from '/imports/api/engine/action/methods/doCheck';
+import { PropTask } from '/imports/api/engine/action/tasks/Task';
+import TaskResult from '/imports/api/engine/action/tasks/TaskResult';
+import { getVariables } from '/imports/api/engine/loadCreatures';
+import numberToSignedString from '/imports/api/utility/numberToSignedString';
+import { isFiniteNode } from '/imports/parser/parseTree/constant';
+
+// TODO implement this 
+/**
+ * A skill property is applied as a check or a saving throw
+ */
+export default async function applyCheckTask(
+  task: PropTask, action: EngineAction, result: TaskResult, inputProvider: InputProvider
+): Promise<void> {
+
+  throw new Meteor.Error('Not implemented', 'This function needs to be implemented');
+
+  const prop = task.prop;
+  const targetIds = task.targetIds;
+  if (targetIds?.length) {
+    throw new Meteor.Error('too-many-targets',
+      'This function is only implemented for zero targets');
+  }
+
+  let checkParams: CheckParams = {
+    advantage: 0,
+    skillVariableName: prop.variableName,
+    abilityVariableName: prop.ability,
+    dc: null,
+  }
+
+  checkParams = await inputProvider.check(checkParams);
+
+  const dc = checkParams.dc;
+  if (!prop.silent && dc !== null) result.appendLog({
+    name: prop.name,
+    value: `DC **${dc}**`,
+    inline: true,
+    ...prop.silent && { silenced: prop.silent }
+  }, targetIds);
+  const scope = await getEffectiveActionScope(action);
+
+  return applyDefaultAfterPropTasks(action, prop, targetIds, inputProvider);
+}
diff --git a/app/imports/api/engine/action/tasks/applyTask.ts b/app/imports/api/engine/action/tasks/applyTask.ts
index 91a0b23b..1a9e4e16 100644
--- a/app/imports/api/engine/action/tasks/applyTask.ts
+++ b/app/imports/api/engine/action/tasks/applyTask.ts
@@ -20,6 +20,15 @@ export default async function applyTask(
 export default async function applyTask(
   action: EngineAction, task: Task, inputProvider: InputProvider
 ): Promise<void | number> {
+
+  // Pause and wait for the user if the action is being stepped through
+  console.log('applying task', action, inputProvider)
+  if (action._isSimulation && action._stepThrough && inputProvider.nextStep) {
+    console.log('waiting for next step resolution', task)
+    await inputProvider.nextStep(task);
+  }
+
+  // Ensure no more than 100 tasks are performed by a single action
   action.taskCount += 1;
   if (action.taskCount > 100) throw 'Only 100 properties can be applied at once';
 
diff --git a/app/imports/client/ui/creature/actions/ActionDialog.vue b/app/imports/client/ui/creature/actions/ActionDialog.vue
index 334b5571..73ea9806 100644
--- a/app/imports/client/ui/creature/actions/ActionDialog.vue
+++ b/app/imports/client/ui/creature/actions/ActionDialog.vue
@@ -10,11 +10,11 @@
         {{ actionJson }}
       </code>
     </pre>
-    <tree-node-view
-      v-for="prop in taskProps"
-      :key="prop._id"
-      :model="prop"
-    />
+    <pre>
+      <code>
+        {{ resultJson }}
+      </code>
+    </pre>
     <v-btn
       slot="actions"
       text
@@ -26,7 +26,8 @@
     <v-btn
       slot="actions"
       text
-      @click="apply(true)"
+      :disabled="!ackNextStep"
+      @click="step"
     >
       Step
     </v-btn>
@@ -42,13 +43,12 @@
 
 <script lang="js">
 import DialogBase from '/imports/client/ui/dialogStack/DialogBase.vue';
-import CreatureProperties from '/imports/api/creature/creatureProperties/CreatureProperties';
-import TreeNodeView from '/imports/client/ui/properties/treeNodeViews/TreeNodeView.vue';
+import EngineActions from '/imports/api/engine/action/EngineActions';
+import applyAction from '/imports/api/engine/action/functions/applyAction';
 
 export default {
   components: {
     DialogBase,
-    TreeNodeView,
   },
   props: {
     actionId: {
@@ -59,27 +59,66 @@ export default {
   data() {
     return {
       loading: false,
-    }
-  },
-  meteor: { 
-    action() {
-      return Actions.findOne(this.actionId);
-    },
-    taskProps() { 
-      if (!this.action) return;
-      return this.action.taskQueue.map(task => {
-        return CreatureProperties.findOne(task.propId);
-      });
-    },
+      actionResult: undefined,
+      ackNextStep: undefined,
+    };
   },
   computed: {
     actionJson() {
       return JSON.stringify(this.action, null, 2);
     },
+    resultJson() {
+      return JSON.stringify(this.actionResult, null, 2);
+    }
+  },
+  mounted() {
+    const vueInstance = this;
+    this.inputProvider = {
+      ackNextStep: undefined,
+      async nextStep() {
+        return new Promise(resolve => {
+          console.log('ackNexStep set')
+          vueInstance.ackNextStep = () => {
+            vueInstance.ackNextStep = undefined;
+            resolve(undefined);
+          }
+        });
+      },
+      async advantage() {
+        return 0;
+      },
+      async rollDice(dice) {
+        const results = [];
+        for (const die of dice) {
+          const rolls = [];
+          for (let i = 0; i < die.number; i++){
+            rolls.push(1);
+          }
+          results.push(rolls);
+        }
+        return results;
+      }
+    }
+  },
+  meteor: {
+    action() {
+      return EngineActions.findOne(this.actionId);
+    },
   },
   methods: {
-    async apply(stepThrough) {
-      throw new Error('Not implemented')
+    async apply() {
+      this.actionResult = {
+        ...this.action,
+        _stepThrough: undefined,
+        _isSimulation: undefined, 
+        taskCount: undefined,
+      };
+      applyAction(
+        this.actionResult, this.inputProvider, { simulate: true, stepThrough: true }
+      )
+    },
+    step() {
+      this.ackNextStep();
     },
     cancel() {
       this.$store.dispatch('popDialogStack');
diff --git a/app/imports/client/ui/creature/actions/doAction.ts b/app/imports/client/ui/creature/actions/doAction.ts
index 59f8dc7a..cd501f62 100644
--- a/app/imports/client/ui/creature/actions/doAction.ts
+++ b/app/imports/client/ui/creature/actions/doAction.ts
@@ -1,11 +1,12 @@
-import { insertAction } from '/imports/api/engine/actions/ActionEngine';
+import { insertAction } from '/imports/api/engine/action/methods/insertAction';
 
 export default async function doAction(prop: any, $store, elementId) {
   const actionId = await insertAction.call({
     action: {
-      creatureId: prop.ancestors[0].id,
+      creatureId: prop.root.id,
       rootPropId: prop._id,
-      taskQueue: [{ propId: prop._id }],
+      results: [],
+      taskCount: 0,
     }
   });
   $store.commit('pushDialogStack', {
diff --git a/app/imports/client/ui/properties/components/actions/ActionCard.vue b/app/imports/client/ui/properties/components/actions/ActionCard.vue
index 5b682afb..40ceb9ac 100644
--- a/app/imports/client/ui/properties/components/actions/ActionCard.vue
+++ b/app/imports/client/ui/properties/components/actions/ActionCard.vue
@@ -116,15 +116,14 @@
 
 <script lang="js">
 import { getPropertyName } from '/imports/constants/PROPERTIES';
-import numberToSignedString from '../../../../../api/utility/numberToSignedString';
-//TODO import doAction from '/imports/api/engine/actions/doAction';
+import numberToSignedString from '/imports/api/utility/numberToSignedString';
+import doAction from '/imports/client/ui/creature/actions/doAction';
 import ActionConditionView from '/imports/client/ui/properties/components/actions/ActionConditionView.vue';
 import AttributeConsumedView from '/imports/client/ui/properties/components/actions/AttributeConsumedView.vue';
 import ItemConsumedView from '/imports/client/ui/properties/components/actions/ItemConsumedView.vue';
 import PropertyIcon from '/imports/client/ui/properties/shared/PropertyIcon.vue';
 import RollPopup from '/imports/client/ui/components/RollPopup.vue';
 import MarkdownText from '/imports/client/ui/components/MarkdownText.vue';
-import { snackbar } from '/imports/client/ui/components/snackbars/SnackbarQueue';
 import CardHighlight from '/imports/client/ui/components/CardHighlight.vue';
 import TreeNodeList from '/imports/client/ui/components/tree/TreeNodeList.vue';
 import { docsToForest as nodeArrayToTree } from '/imports/api/parenting/parentingFunctions';
diff --git a/app/imports/client/ui/properties/components/actions/EventButton.vue b/app/imports/client/ui/properties/components/actions/EventButton.vue
index 77ffcaa6..1c90adbc 100644
--- a/app/imports/client/ui/properties/components/actions/EventButton.vue
+++ b/app/imports/client/ui/properties/components/actions/EventButton.vue
@@ -1,7 +1,7 @@
 <template lang="html">
   <v-btn
-    :loading="doActionLoading"
     :disabled="context.editPermission === false"
+    :data-id="`event-btn-${model._id}`"
     outlined
     class="event-button"
     style="min-width: 160px; max-width: 100%;"
@@ -21,9 +21,8 @@
 </template>
 
 <script lang="js">
-//TODO import doAction from '/imports/api/engine/actions/doAction';
+import doAction from '/imports/client/ui/creature/actions/doAction';
 import PropertyIcon from '/imports/client/ui/properties/shared/PropertyIcon.vue';
-import { snackbar } from '/imports/client/ui/components/snackbars/SnackbarQueue';
 
 export default {
   components: {
@@ -39,36 +38,12 @@ export default {
     },
   },
   data(){return {
-    activated: undefined,
-    doActionLoading: false,
     hovering: false,
   }},
   methods: {
-    click(e) {
-      this.$emit('click', e);
+    doAction() {
+      doAction(this.model, this.$store, `event-btn-${this.model._id}`);
     },
-    doAction({ advantage }) {
-      this.doActionLoading = true;
-      this.shwing();
-      doAction.call({
-        actionId: this.model._id,
-        scope: {
-          '~attackAdvantage': { value: advantage },
-        }
-      }, error => {
-        this.doActionLoading = false;
-        if (error) {
-          console.error(error);
-          snackbar({ text: error.reason });
-        }
-      });
-    },
-    shwing() {
-      this.activated = true;
-      setTimeout(() => {
-        this.activated = undefined;
-      }, 150);
-    }
   }
 }
 </script>
diff --git a/app/server/main.js b/app/server/main.js
index 3e1f8725..11d21914 100644
--- a/app/server/main.js
+++ b/app/server/main.js
@@ -16,3 +16,4 @@ import '/imports/constants/MAINTENANCE_MODE';
 import '/imports/api/creature/creatureProperties/methods/index';
 import '/imports/api/creature/archive/methods/index';
 import '/imports/api/creature/creatures/methods/index';
+import '/imports/api/engine/action/methods/index';