diff --git a/IDEAS.md b/IDEAS.md
index daadede..e42d290 100644
--- a/IDEAS.md
+++ b/IDEAS.md
@@ -14,7 +14,7 @@ A running list of planned features and content additions. Strike through items a
 
 - [x] **Boss first-kill bounties** — Defeating a boss for the very first time grants a one-time runestone bonus. Rewards exploration and makes conquering a new zone feel extra satisfying.
 
-- [ ] **Auto-prestige toggle** — Unlockable via the prestige shop. Automatically prestiges the moment the threshold is reached. Late-game convenience that dedicated players will love.
+- [x] **Auto-prestige toggle** — Unlockable via the prestige shop. Automatically prestiges the moment the threshold is reached. Late-game convenience that dedicated players will love.
 
 ---
 
@@ -32,7 +32,7 @@ A running list of planned features and content additions. Strike through items a
 
 - [x] **Statistics panel** — All-time totals: gold earned across all runs, total prestiges, bosses defeated, quests completed, time played. Idle game players love seeing big numbers about their big numbers.
 
-- [ ] **Last cloud save date + Force cloud save button** — Display when the last cloud save occurred (always visible, e.g. in the ResourceBar). Include a manual "Force Save" button for peace of mind.
+- [x] **Last cloud save date + Force cloud save button** — Display when the last cloud save occurred (always visible, e.g. in the ResourceBar). Include a manual "Force Save" button for peace of mind.
 
 ---
 
@@ -44,6 +44,6 @@ A running list of planned features and content additions. Strike through items a
 4. ~~Boss first-kill bounties~~ ✅
 5. ~~Milestone prestige bonuses~~ ✅
 6. ~~Equipment set bonuses~~ ✅
-7. Auto-prestige toggle (prestige shop upgrade)
+7. ~~Auto-prestige toggle~~ ✅
 8. The Codex / Lore Book (flavour, lower priority)
 9. Second prestige layer / Transcendence (big feature, save for later)
diff --git a/apps/api/src/data/prestigeUpgrades.ts b/apps/api/src/data/prestigeUpgrades.ts
index 6bd2f18..bf5916b 100644
--- a/apps/api/src/data/prestigeUpgrades.ts
+++ b/apps/api/src/data/prestigeUpgrades.ts
@@ -184,6 +184,16 @@ export const DEFAULT_PRESTIGE_UPGRADES: PrestigeUpgrade[] = [
     runestonesCost: 1_200,
     multiplier: 25,
   },
+  // ── Utility Unlocks ───────────────────────────────────────────────────────
+  {
+    id: "auto_prestige",
+    name: "Autonomous Ascension",
+    description:
+      "Unlock the Auto-Prestige toggle. When enabled, you will automatically ascend the moment you reach the prestige threshold — using your current character name.",
+    category: "utility",
+    runestonesCost: 100,
+    multiplier: 1,
+  },
   // ── Runestone Meta-Upgrade ────────────────────────────────────────────────
   {
     id: "runestone_gain_1",
diff --git a/apps/api/src/services/prestige.ts b/apps/api/src/services/prestige.ts
index dfb9a40..556da1b 100644
--- a/apps/api/src/services/prestige.ts
+++ b/apps/api/src/services/prestige.ts
@@ -101,6 +101,9 @@ export const buildPostPrestigeState = (
     purchasedUpgradeIds,
     lastPrestigedAt: Date.now(),
     ...computeRunestoneMultipliers(purchasedUpgradeIds),
+    ...(currentState.prestige.autoPrestigeEnabled !== undefined
+      ? { autoPrestigeEnabled: currentState.prestige.autoPrestigeEnabled }
+      : {}),
   };
 
   const freshState = INITIAL_GAME_STATE(currentState.player, characterName);
diff --git a/apps/web/src/components/game/AboutPanel.tsx b/apps/web/src/components/game/AboutPanel.tsx
index cf01b37..1414fd4 100644
--- a/apps/web/src/components/game/AboutPanel.tsx
+++ b/apps/web/src/components/game/AboutPanel.tsx
@@ -39,6 +39,10 @@ const HOW_TO_PLAY = [
     title: "🔮 Runestones & Prestige Upgrades",
     body: "Spend runestones in the Prestige Shop on permanent upgrades that carry over across all future runs. These upgrades multiply income, click power, essence, and crystal gain — making each new run more powerful than the last.",
   },
+  {
+    title: "⚙️ Auto-Prestige",
+    body: "Purchase the Autonomous Ascension upgrade in the Prestige Shop (100 runestones) to unlock the Auto-Prestige toggle. When enabled, you will automatically ascend the moment you reach the prestige threshold, using your current character name. Toggle it on and off freely from the Prestige Shop.",
+  },
   {
     title: "🏆 Achievements",
     body: "Earn achievements by hitting milestones — total gold earned, bosses defeated, quests completed, and more. Achievements are purely cosmetic and track your long-term progress across all prestige runs.",
diff --git a/apps/web/src/components/game/PrestigePanel.tsx b/apps/web/src/components/game/PrestigePanel.tsx
index d25010c..eb5fba1 100644
--- a/apps/web/src/components/game/PrestigePanel.tsx
+++ b/apps/web/src/components/game/PrestigePanel.tsx
@@ -36,10 +36,11 @@ const CATEGORY_ORDER: PrestigeUpgradeCategory[] = [
   "essence",
   "crystals",
   "runestones",
+  "utility",
 ];
 
 export const PrestigePanel = (): React.JSX.Element => {
-  const { state, reload, formatNumber, buyPrestigeUpgrade } = useGame();
+  const { state, reload, formatNumber, buyPrestigeUpgrade, toggleAutoPrestige } = useGame();
   const [characterName, setCharacterName] = useState("");
   const [isPending, setIsPending] = useState(false);
   const [result, setResult] = useState<{ runestones: number; count: number; milestoneRunestones: number } | null>(null);
@@ -205,6 +206,9 @@ export const PrestigePanel = (): React.JSX.Element => {
                   const canAfford = prestigeData.runestones >= upgrade.runestonesCost;
                   const isLoading = buyingId === upgrade.id;
 
+                  const isAutoPrestigeToggle = upgrade.id === "auto_prestige" && purchased;
+                  const autoPrestigeEnabled = prestigeData.autoPrestigeEnabled ?? false;
+
                   return (
                     <div
                       key={upgrade.id}
@@ -217,6 +221,15 @@ export const PrestigePanel = (): React.JSX.Element => {
                           {purchased ? "✅ Purchased" : `🔮 ${formatNumber(upgrade.runestonesCost)} Runestones`}
                         </p>
                       </div>
+                      {isAutoPrestigeToggle && (
+                        <button
+                          className={`auto-prestige-toggle ${autoPrestigeEnabled ? "enabled" : "disabled"}`}
+                          onClick={() => { toggleAutoPrestige(); }}
+                          type="button"
+                        >
+                          {autoPrestigeEnabled ? "⚡ Auto ON" : "⏸ Auto OFF"}
+                        </button>
+                      )}
                       {!purchased && (
                         <button
                           className="buy-upgrade-button"
diff --git a/apps/web/src/context/GameContext.tsx b/apps/web/src/context/GameContext.tsx
index 55fa7b8..8950753 100644
--- a/apps/web/src/context/GameContext.tsx
+++ b/apps/web/src/context/GameContext.tsx
@@ -11,6 +11,7 @@ import {
   buyPrestigeUpgrade as buyPrestigeUpgradeApi,
   challengeBoss as challengeBossApi,
   loadGame,
+  prestige as prestigeApi,
   saveGame,
 } from "../api/client.js";
 import { RESOURCE_CAP, applyTick, calculateClickPower } from "../engine/tick.js";
@@ -73,11 +74,15 @@ interface GameContextValue {
   formatNumber: (value: number) => string;
   /** Buy a prestige upgrade from the runestone shop */
   buyPrestigeUpgrade: (upgradeId: string) => Promise<void>;
+  /** Toggle the auto-prestige setting on/off (requires auto_prestige upgrade) */
+  toggleAutoPrestige: () => void;
 }
 
 const GameContext = createContext<GameContextValue | null>(null);
 
 const AUTO_SAVE_INTERVAL_MS = 30_000;
+const AUTO_PRESTIGE_THRESHOLD_BASE = 1_000_000;
+const AUTO_PRESTIGE_THRESHOLD_SCALE = 5;
 
 export const GameProvider = ({ children }: { children: React.ReactNode }): React.JSX.Element => {
   const [state, setState] = useState<GameState | null>(null);
@@ -98,6 +103,8 @@ export const GameProvider = ({ children }: { children: React.ReactNode }): React
   const rafRef = useRef<number | null>(null);
   const newlyUnlockedRef = useRef<Achievement[]>([]);
   const signatureRef = useRef<string | null>(localStorage.getItem("elysium_save_signature"));
+  const isAutoPrestigingRef = useRef(false);
+  const reloadRef = useRef<() => Promise<void>>(() => Promise.resolve());
 
   stateRef.current = state;
 
@@ -136,6 +143,8 @@ export const GameProvider = ({ children }: { children: React.ReactNode }): React
     }
   }, []);
 
+  reloadRef.current = reload;
+
   useEffect(() => {
     void reload();
   }, [reload]);
@@ -191,6 +200,23 @@ export const GameProvider = ({ children }: { children: React.ReactNode }): React
         }
       }
 
+      // Auto-prestige: fire when unlocked, enabled, and threshold is met
+      const autoState = stateRef.current;
+      if (
+        !isAutoPrestigingRef.current &&
+        autoState?.prestige.purchasedUpgradeIds.includes("auto_prestige") &&
+        autoState.prestige.autoPrestigeEnabled &&
+        autoState.player.totalGoldEarned >=
+          AUTO_PRESTIGE_THRESHOLD_BASE *
+            Math.pow(AUTO_PRESTIGE_THRESHOLD_SCALE, autoState.prestige.count)
+      ) {
+        isAutoPrestigingRef.current = true;
+        void prestigeApi({ characterName: autoState.player.characterName })
+          .then(() => reloadRef.current())
+          .catch(() => { /* silently ignore — will retry next tick */ })
+          .finally(() => { isAutoPrestigingRef.current = false; });
+      }
+
       rafRef.current = requestAnimationFrame(tick);
     };
 
@@ -404,6 +430,19 @@ export const GameProvider = ({ children }: { children: React.ReactNode }): React
     }
   }, []);
 
+  const toggleAutoPrestige = useCallback(() => {
+    setState((prev) => {
+      if (!prev) return prev;
+      return {
+        ...prev,
+        prestige: {
+          ...prev.prestige,
+          autoPrestigeEnabled: !prev.prestige.autoPrestigeEnabled,
+        },
+      };
+    });
+  }, []);
+
   const challengeBoss = useCallback(async (bossId: string) => {
     if (!stateRef.current) return;
     const boss = stateRef.current.bosses.find((b) => b.id === bossId);
@@ -566,6 +605,7 @@ export const GameProvider = ({ children }: { children: React.ReactNode }): React
         setNumberFormat,
         formatNumber: boundFormatNumber,
         buyPrestigeUpgrade,
+        toggleAutoPrestige,
       }}
     >
       {children}
diff --git a/apps/web/src/data/prestigeUpgrades.ts b/apps/web/src/data/prestigeUpgrades.ts
index d6d4f56..6927a44 100644
--- a/apps/web/src/data/prestigeUpgrades.ts
+++ b/apps/web/src/data/prestigeUpgrades.ts
@@ -181,6 +181,16 @@ export const PRESTIGE_UPGRADES: PrestigeUpgrade[] = [
     runestonesCost: 1_200,
     multiplier: 25,
   },
+  // ── Utility Unlocks ───────────────────────────────────────────────────────
+  {
+    id: "auto_prestige",
+    name: "Autonomous Ascension",
+    description:
+      "Unlock the Auto-Prestige toggle. When enabled, you will automatically ascend the moment you reach the prestige threshold — using your current character name.",
+    category: "utility",
+    runestonesCost: 100,
+    multiplier: 1,
+  },
   // ── Runestone Meta-Upgrades ───────────────────────────────────────────────
   {
     id: "runestone_gain_1",
@@ -206,4 +216,5 @@ export const PRESTIGE_UPGRADE_CATEGORY_LABELS: Record<string, string> = {
   essence: "✨ Essence Production",
   crystals: "💎 Crystal Rewards",
   runestones: "🔮 Runestone Gain",
+  utility: "⚙️ Utility",
 };
diff --git a/apps/web/src/styles.css b/apps/web/src/styles.css
index ecd1127..9277149 100644
--- a/apps/web/src/styles.css
+++ b/apps/web/src/styles.css
@@ -642,6 +642,32 @@ body {
   font-size: 0.8rem;
 }
 
+.auto-prestige-toggle {
+  border-radius: var(--radius-sm);
+  border: 1px solid var(--colour-border);
+  cursor: pointer;
+  font-size: 0.85rem;
+  font-weight: 600;
+  padding: 0.4rem 0.8rem;
+  transition: background 0.2s, border-color 0.2s;
+  white-space: nowrap;
+}
+
+.auto-prestige-toggle.enabled {
+  background: var(--colour-success);
+  border-color: var(--colour-success);
+  color: #fff;
+}
+
+.auto-prestige-toggle.disabled {
+  background: var(--colour-surface);
+  color: var(--colour-text-muted);
+}
+
+.auto-prestige-toggle:hover {
+  border-color: var(--colour-accent);
+}
+
 /* ===================== LOGIN PAGE ===================== */
 .login-page {
   align-items: center;
diff --git a/packages/types/src/interfaces/Prestige.ts b/packages/types/src/interfaces/Prestige.ts
index 043d747..e0e427a 100644
--- a/packages/types/src/interfaces/Prestige.ts
+++ b/packages/types/src/interfaces/Prestige.ts
@@ -17,4 +17,6 @@ export interface PrestigeData {
   runestonesEssenceMultiplier?: number;
   /** Pre-computed multiplier from "crystals" runestone upgrades */
   runestonesCrystalMultiplier?: number;
+  /** Whether the auto-prestige feature is currently enabled (requires auto_prestige upgrade) */
+  autoPrestigeEnabled?: boolean;
 }
diff --git a/packages/types/src/interfaces/PrestigeUpgrade.ts b/packages/types/src/interfaces/PrestigeUpgrade.ts
index 06bae02..c8511d1 100644
--- a/packages/types/src/interfaces/PrestigeUpgrade.ts
+++ b/packages/types/src/interfaces/PrestigeUpgrade.ts
@@ -3,7 +3,8 @@ export type PrestigeUpgradeCategory =
   | "click"
   | "essence"
   | "crystals"
-  | "runestones";
+  | "runestones"
+  | "utility";
 
 export interface PrestigeUpgrade {
   id: string;