diff --git a/module/actor.js b/module/actor.js
index 8288404..034b26a 100644
--- a/module/actor.js
+++ b/module/actor.js
@@ -11,6 +11,7 @@ export class SimpleActor extends Actor {
     super.prepareDerivedData();
     this.data.data.groups = this.data.data.groups || {};
     this.data.data.attributes = this.data.data.attributes || {};
+    EntitySheetHelper.clampResourceValues(this.data.data.attributes);
   }
 
   /* -------------------------------------------- */
@@ -20,6 +21,16 @@ export class SimpleActor extends Actor {
     return EntitySheetHelper.createDialog.call(this, data, options);
   }
 
+  /* -------------------------------------------- */
+
+  /**
+   * Is this Actor used as a template for other Actors?
+   * @type {boolean}
+   */
+  get isTemplate() {
+    return !!this.getFlag("worldbuilding", "isTemplate");
+  }
+
   /* -------------------------------------------- */
   /*  Roll Data Preparation                       */
   /* -------------------------------------------- */
@@ -236,4 +247,17 @@ export class SimpleActor extends Actor {
       }
     }
   }
+
+  /* -------------------------------------------- */
+
+  /** @inheritdoc */
+  async modifyTokenAttribute(attribute, value, isDelta = false, isBar = true) {
+    const current = foundry.utils.getProperty(this.data.data, attribute);
+    if ( !isBar || !isDelta || (current?.dtype !== "Resource") ) {
+      return super.modifyTokenAttribute(attribute, value, isDelta, isBar);
+    }
+    const updates = {[`data.${attribute}.value`]: Math.clamped(current.value + value, current.min, current.max)};
+    const allowed = Hooks.call("modifyTokenAttribute", {attribute, value, isDelta, isBar}, updates);
+    return allowed !== false ? this.update(updates) : this;
+  }
 }
diff --git a/module/helper.js b/module/helper.js
index 4997798..dd04769 100644
--- a/module/helper.js
+++ b/module/helper.js
@@ -587,4 +587,21 @@ export class EntitySheetHelper {
       options: options
     });
   }
+
+  /* -------------------------------------------- */
+
+  /**
+   * Ensure the resource values are within the specified min and max.
+   * @param {object} attrs  The Document's attributes.
+   */
+  static clampResourceValues(attrs) {
+    const flat = foundry.utils.flattenObject(attrs);
+    for ( const [attr, value] of Object.entries(flat) ) {
+      const parts = attr.split(".");
+      if ( parts.pop() !== "value" ) continue;
+      const current = foundry.utils.getProperty(attrs, parts.join("."));
+      if ( current?.dtype !== "Resource" ) continue;
+      foundry.utils.setProperty(attrs, attr, Math.clamped(value, current.min || 0, current.max || 0));
+    }
+  }
 }
diff --git a/module/item.js b/module/item.js
index b4e0cce..99fb5a0 100644
--- a/module/item.js
+++ b/module/item.js
@@ -11,6 +11,7 @@ export class SimpleItem extends Item {
     super.prepareDerivedData();
     this.data.data.groups = this.data.data.groups || {};
     this.data.data.attributes = this.data.data.attributes || {};
+    EntitySheetHelper.clampResourceValues(this.data.data.attributes);
   }
 
   /* -------------------------------------------- */
@@ -19,4 +20,14 @@ export class SimpleItem extends Item {
   static async createDialog(data={}, options={}) {
     return EntitySheetHelper.createDialog.call(this, data, options);
   }
+
+  /* -------------------------------------------- */
+
+  /**
+   * Is this Item used as a template for other Items?
+   * @type {boolean}
+   */
+  get isTemplate() {
+    return !!this.getFlag("worldbuilding", "isTemplate");
+  }
 }
diff --git a/module/macro.js b/module/macro.js
index 4f07cbf..067b580 100644
--- a/module/macro.js
+++ b/module/macro.js
@@ -6,6 +6,7 @@
  * @returns {Promise}
  */
 export async function createWorldbuildingMacro(data, slot) {
+  if ( !data.roll || !data.label ) return false;
   const command = `const roll = new Roll("${data.roll}", actor ? actor.getRollData() : {});
   roll.toMessage({speaker, flavor: "${data.label}"});`;
   let macro = game.macros.find(m => (m.name === data.label) && (m.command === command));
diff --git a/module/simple.js b/module/simple.js
index 059bea6..6ffff4d 100644
--- a/module/simple.js
+++ b/module/simple.js
@@ -10,7 +10,7 @@ import { SimpleItemSheet } from "./item-sheet.js";
 import { SimpleActorSheet } from "./actor-sheet.js";
 import { preloadHandlebarsTemplates } from "./templates.js";
 import { createWorldbuildingMacro } from "./macro.js";
-import { SimpleTokenDocument } from "./simpletokendocument.js";
+import { SimpleToken, SimpleTokenDocument } from "./token.js";
 
 /* -------------------------------------------- */
 /*  Foundry VTT Initialization                  */
@@ -40,9 +40,8 @@ Hooks.once("init", async function() {
   // Define custom Document classes
   CONFIG.Actor.documentClass = SimpleActor;
   CONFIG.Item.documentClass = SimpleItem;
-  
-  // Update TokenDocument with overrided getBarAttribute method
   CONFIG.Token.documentClass = SimpleTokenDocument;
+  CONFIG.Token.objectClass = SimpleToken;
 
   // Register sheet application classes
   Actors.unregisterSheet("core", ActorSheet);
@@ -116,7 +115,7 @@ Hooks.on("getActorDirectoryEntryContext", (html, options) => {
     icon: '<i class="fas fa-stamp"></i>',
     condition: li => {
       const actor = game.actors.get(li.data(idAttr));
-      return !actor.getFlag("worldbuilding", "isTemplate");
+      return !actor.isTemplate;
     },
     callback: li => {
       const actor = game.actors.get(li.data(idAttr));
@@ -130,7 +129,7 @@ Hooks.on("getActorDirectoryEntryContext", (html, options) => {
     icon: '<i class="fas fa-times"></i>',
     condition: li => {
       const actor = game.actors.get(li.data(idAttr));
-      return actor.getFlag("worldbuilding", "isTemplate");
+      return actor.isTemplate;
     },
     callback: li => {
       const actor = game.actors.get(li.data(idAttr));
@@ -150,7 +149,7 @@ Hooks.on("getItemDirectoryEntryContext", (html, options) => {
     icon: '<i class="fas fa-stamp"></i>',
     condition: li => {
       const item = game.items.get(li.data(idAttr));
-      return !item.getFlag("worldbuilding", "isTemplate");
+      return !item.isTemplate;
     },
     callback: li => {
       const item = game.items.get(li.data(idAttr));
@@ -164,7 +163,7 @@ Hooks.on("getItemDirectoryEntryContext", (html, options) => {
     icon: '<i class="fas fa-times"></i>',
     condition: li => {
       const item = game.items.get(li.data(idAttr));
-      return item.getFlag("worldbuilding", "isTemplate");
+      return item.isTemplate;
     },
     callback: li => {
       const item = game.items.get(li.data(idAttr));
diff --git a/module/simpletokendocument.js b/module/simpletokendocument.js
deleted file mode 100644
index dd63f65..0000000
--- a/module/simpletokendocument.js
+++ /dev/null
@@ -1,11 +0,0 @@
-export class SimpleTokenDocument extends TokenDocument {
-
-  /** @inheritdoc */
-  getBarAttribute(barName, {alternative}={}) {
-	const attr = super.getBarAttribute(barName, {alternative});
-	if ( attr === null ) return null;
-	attr.editable = true; // Attribute always editable, super requires attr to exist in actor template
-	return attr;
-  }
-  
-}
\ No newline at end of file
diff --git a/module/token.js b/module/token.js
new file mode 100644
index 0000000..aca893a
--- /dev/null
+++ b/module/token.js
@@ -0,0 +1,52 @@
+/**
+ * Extend the base TokenDocument to support resource type attributes.
+ * @extends {TokenDocument}
+ */
+export class SimpleTokenDocument extends TokenDocument {
+  /** @inheritdoc */
+  getBarAttribute(barName, {alternative}={}) {
+    const data = super.getBarAttribute(barName, {alternative});
+    const attr = alternative || this.data[barName]?.attribute;
+    if ( !data || !attr || !this.actor ) return data;
+    const current = foundry.utils.getProperty(this.actor.data.data, attr);
+    if ( "min" in current ) data.min = parseInt(current.min || 0);
+    data.editable = true;
+    return data;
+  }
+
+  /* -------------------------------------------- */
+
+  static getTrackedAttributes(data, _path=[]) {
+    if ( data || _path.length ) return super.getTrackedAttributes(data, _path);
+    data = {};
+    for ( const model of Object.values(game.system.model.Actor) ) {
+      foundry.utils.mergeObject(data, model);
+    }
+    for ( const actor of game.actors ) {
+      if ( actor.isTemplate ) foundry.utils.mergeObject(data, actor.toObject().data);
+    }
+    return super.getTrackedAttributes(data);
+  }
+}
+
+
+/* -------------------------------------------- */
+
+
+/**
+ * Extend the base Token class to implement additional system-specific logic.
+ * @extends {Token}
+ */
+export class SimpleToken extends Token {
+  _drawBar(number, bar, data) {
+    if ( "min" in data ) {
+      // Copy the data to avoid mutating what the caller gave us.
+      data = {...data};
+      // Shift the value and max by the min to ensure that the bar's percentage is drawn accurately if this resource has
+      // a non-zero min.
+      data.value -= data.min;
+      data.max -= data.min;
+    }
+    return super._drawBar(number, bar, data);
+  }
+}