diff --git a/CHANGELOG.md b/CHANGELOG.md
index eba113a..5806f9b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,8 @@ versioned release tag yet, so entries are organized as pre-alpha snapshots.
   cooldown, activity logging, and zero-time body death.
 - Nakama `secondspawn_reincarnate` RPC for a prototype zero-time death to fresh
   body flow using a 5-day SECOND cost against a 7-day starting test balance.
+- Nakama `secondspawn_cultivation_event` RPC for prototype Nibirium absorption
+  XP and Awakening to Enhancement promotion.
 
 ### Changed
 
@@ -43,6 +45,8 @@ versioned release tag yet, so entries are organized as pre-alpha snapshots.
   lifecycle state in the shared profile DTO.
 - Unity gateway client now exposes SECOND balance, reincarnation count, and a
   Nakama reincarnation wrapper for prototype UI and playtest flows.
+- Unity gateway client now exposes a Nakama cultivation event wrapper for the
+  first two cultivation tiers.
 
 ### Verification
 
diff --git a/Unity/Assets/_SecondSpawn/Scripts/AI/AgentContextDto.cs b/Unity/Assets/_SecondSpawn/Scripts/AI/AgentContextDto.cs
index 7445091..1f9c290 100644
--- a/Unity/Assets/_SecondSpawn/Scripts/AI/AgentContextDto.cs
+++ b/Unity/Assets/_SecondSpawn/Scripts/AI/AgentContextDto.cs
@@ -95,6 +95,15 @@ public sealed class ReincarnationRequestDto
         public string reason;
     }
 
+    [Serializable]
+    public sealed class CultivationEventRequestDto
+    {
+        public string id;
+        public string source;
+        public long amount_xp;
+        public string note;
+    }
+
     [Serializable]
     public sealed class CultivationDto
     {
diff --git a/Unity/Assets/_SecondSpawn/Scripts/AI/SecondSpawnGatewayClient.cs b/Unity/Assets/_SecondSpawn/Scripts/AI/SecondSpawnGatewayClient.cs
index 464d56e..d083f2b 100644
--- a/Unity/Assets/_SecondSpawn/Scripts/AI/SecondSpawnGatewayClient.cs
+++ b/Unity/Assets/_SecondSpawn/Scripts/AI/SecondSpawnGatewayClient.cs
@@ -166,6 +166,11 @@ public IEnumerator ReincarnateNakamaBody(ReincarnationRequestDto request, Action
             yield return SendNakamaRpc("secondspawn_reincarnate", request, onSuccess, onError);
         }
 
+        public IEnumerator ApplyNakamaCultivationEvent(CultivationEventRequestDto request, Action<AgentContextDto> onSuccess = null, Action<string> onError = null)
+        {
+            yield return SendNakamaRpc("secondspawn_cultivation_event", request, onSuccess, onError);
+        }
+
         public IEnumerator UpdateNakamaSoul(UpdateSoulRequestDto request, Action<AgentContextDto> onSuccess = null, Action<string> onError = null)
         {
             yield return SendNakamaRpc("secondspawn_soul_update", request, onSuccess, onError);
diff --git a/backend/nakama/modules/index.ts b/backend/nakama/modules/index.ts
index 14e1ee3..f9352c2 100644
--- a/backend/nakama/modules/index.ts
+++ b/backend/nakama/modules/index.ts
@@ -15,6 +15,7 @@ var rpcIdAgentDecide = "secondspawn_agent_decide";
 var rpcIdAgentActivityAdd = "secondspawn_agent_activity_add";
 var rpcIdBodyTimeEvent = "secondspawn_bodytime_event";
 var rpcIdReincarnate = "secondspawn_reincarnate";
+var rpcIdCultivationEvent = "secondspawn_cultivation_event";
 var agentActivityLogLimit = 32;
 var agentRuntimeMetricMax = 1000000000;
 var bodyTimeMaxSeconds = 86400 * 30;
@@ -25,6 +26,8 @@ var bodyTimeEarnCooldownSeconds = 60;
 var secondPrototypeMaxBalanceSeconds = 86400 * 365;
 var secondPrototypeStartingBalanceSeconds = 86400 * 7;
 var secondPrototypeReincarnationCostSeconds = 86400 * 5;
+var cultivationPrototypeXpCap = 500;
+var cultivationAwakeningToEnhancementXp = 1000;
 
 let InitModule: nkruntime.InitModule = function (
   ctx: nkruntime.Context,
@@ -40,6 +43,7 @@ let InitModule: nkruntime.InitModule = function (
   initializer.registerRpc(rpcIdAgentActivityAdd, rpcAgentActivityAdd);
   initializer.registerRpc(rpcIdBodyTimeEvent, rpcBodyTimeEvent);
   initializer.registerRpc(rpcIdReincarnate, rpcReincarnate);
+  initializer.registerRpc(rpcIdCultivationEvent, rpcCultivationEvent);
   initializer.registerBeforeAuthenticateCustom(beforeAuthenticateCustom);
   logger.info("Second Spawn Nakama runtime loaded.");
 };
@@ -249,6 +253,29 @@ function rpcReincarnate(
   return JSON.stringify(context);
 }
 
+function rpcCultivationEvent(
+  ctx: nkruntime.Context,
+  logger: nkruntime.Logger,
+  nk: nkruntime.Nakama,
+  payload: string
+): string {
+  var state = getOrCreateAgentContextState(ctx, nk);
+  var context = state.context;
+  var event = normalizeCultivationEvent(parseJson(payload || "{}", "cultivation payload"));
+
+  ensureBodyTime(context);
+  if (event.id && hasAgentActivityId(context.body.agent_activity || [], event.id)) {
+    return JSON.stringify(context);
+  }
+  if (context.body.lifecycle === "dead") {
+    throw new Error("dead bodies cannot progress cultivation before reincarnation");
+  }
+
+  applyCultivationEvent(context, event, nk);
+  writeAgentContext(nk, context, state.version);
+  return JSON.stringify(context);
+}
+
 function beforeAuthenticateCustom(
   ctx: nkruntime.Context,
   logger: nkruntime.Logger,
@@ -655,6 +682,93 @@ function reincarnateBody(context: any, request: any, nk: nkruntime.Nakama): void
   }, nk);
 }
 
+function normalizeCultivationEvent(request: any): any {
+  var source = trimString(request.source);
+  if (source !== "prototype_nibirium_absorb") {
+    throw new Error("cultivation source is not allowed");
+  }
+
+  var amount = Number(firstDefined(request.amount_xp, request.xp));
+  if (isNaN(amount) || !isFinite(amount) || amount <= 0) {
+    throw new Error("cultivation amount_xp must be a positive finite number");
+  }
+
+  return {
+    id: trimString(request.id),
+    source: source,
+    amount_xp: clampNumber(Math.floor(amount), 1, cultivationPrototypeXpCap),
+    note: trimString(request.note)
+  };
+}
+
+function applyCultivationEvent(context: any, event: any, nk: nkruntime.Nakama): void {
+  ensureCultivation(context);
+  var cultivation = context.body.cultivation;
+  var beforeTier = cultivation.tier;
+  var beforeXp = cultivation.progress_xp;
+  var promoted = false;
+
+  if (cultivation.tier === "Awakening") {
+    cultivation.progress_xp = clampNumber(cultivation.progress_xp + event.amount_xp, 0, cultivationAwakeningToEnhancementXp);
+    if (cultivation.progress_xp >= cultivationAwakeningToEnhancementXp) {
+      cultivation.tier = "Enhancement";
+      cultivation.progress_xp = 0;
+      promoted = true;
+    }
+  } else {
+    cultivation.tier = "Enhancement";
+    cultivation.progress_xp = clampNumber(cultivation.progress_xp + event.amount_xp, 0, cultivationAwakeningToEnhancementXp);
+  }
+
+  addAgentActivity(context, {
+    id: event.id || "",
+    kind: "cultivation",
+    summary: cultivationActivitySummary(event, beforeTier, beforeXp, cultivation, promoted),
+    source: "nakama",
+    cultivation_source: event.source,
+    cultivation_xp: event.amount_xp,
+    metrics: {
+      cultivation_xp: event.amount_xp,
+      cultivation_before_xp: beforeXp,
+      cultivation_after_xp: cultivation.progress_xp,
+      cultivation_promoted: promoted ? 1 : 0
+    }
+  }, nk);
+}
+
+function ensureCultivation(context: any): void {
+  if (!context.body) {
+    context.body = {};
+  }
+  if (!context.body.cultivation) {
+    context.body.cultivation = {};
+  }
+
+  var tier = trimString(context.body.cultivation.tier);
+  if (tier !== "Enhancement") {
+    tier = "Awakening";
+  }
+  context.body.cultivation.tier = tier;
+  context.body.cultivation.progress_xp = clampNumber(
+    Math.floor(finiteNumberOrDefault(context.body.cultivation.progress_xp, 0)),
+    0,
+    cultivationAwakeningToEnhancementXp
+  );
+}
+
+function cultivationActivitySummary(event: any, beforeTier: string, beforeXp: number, cultivation: any, promoted: boolean): string {
+  var summary = "Cultivation gained " + event.amount_xp + " XP from " + event.source + ".";
+  if (promoted) {
+    summary += " Tier advanced from " + beforeTier + " to Enhancement.";
+  } else {
+    summary += " Progress moved from " + beforeXp + " to " + cultivation.progress_xp + " XP in " + cultivation.tier + ".";
+  }
+  if (event.note) {
+    summary += " " + event.note;
+  }
+  return summary;
+}
+
 function hasRecentBodyTimeEvent(context: any, event: any, cooldownSeconds: number): boolean {
   var activities = context.body.agent_activity || [];
   var nowMs = new Date().getTime();
@@ -778,6 +892,7 @@ function normalizeAgentActivityKind(kind: any): string {
     value === "agent_decision" ||
     value === "body_time" ||
     value === "reincarnation" ||
+    value === "cultivation" ||
     value === "memory_sync" ||
     value === "manual_note"
   ) {
diff --git a/backend/nakama/tests/supabase_custom_auth.test.mjs b/backend/nakama/tests/supabase_custom_auth.test.mjs
index e37ba14..d9e5e61 100644
--- a/backend/nakama/tests/supabase_custom_auth.test.mjs
+++ b/backend/nakama/tests/supabase_custom_auth.test.mjs
@@ -129,7 +129,7 @@ assert.equal(
 
 const harness = createRuntimeHarness(module);
 assert.equal(harness.registeredHooks.length, 1);
-assert.equal(harness.registeredRpcs.size, 8);
+assert.equal(harness.registeredRpcs.size, 9);
 assert.ok(harness.registeredRpcs.has("secondspawn_health"));
 assert.ok(harness.registeredRpcs.has("secondspawn_profile_get"));
 assert.ok(harness.registeredRpcs.has("secondspawn_memory_add"));
@@ -138,6 +138,7 @@ assert.ok(harness.registeredRpcs.has("secondspawn_agent_decide"));
 assert.ok(harness.registeredRpcs.has("secondspawn_agent_activity_add"));
 assert.ok(harness.registeredRpcs.has("secondspawn_bodytime_event"));
 assert.ok(harness.registeredRpcs.has("secondspawn_reincarnate"));
+assert.ok(harness.registeredRpcs.has("secondspawn_cultivation_event"));
 
 const createConflictHarness = createRuntimeHarness(module);
 createConflictHarness.conflictNextCreateOnlyWrite();
@@ -174,6 +175,8 @@ assert.equal(profile.body.stats.max_health, 100);
 assert.equal(profile.body.stats.attack_power, 10);
 assert.equal(profile.body.time.remaining_seconds, 86400);
 assert.equal(profile.body.lifecycle, "alive");
+assert.equal(profile.body.cultivation.tier, "Awakening");
+assert.equal(profile.body.cultivation.progress_xp, 0);
 assert.equal(profile.body.agent_runtime.decision_count, 0);
 assert.equal(profile.body.agent_runtime.fallback_decision_count, 0);
 assert.equal(profile.body.agent_activity.length, 1);
@@ -239,6 +242,59 @@ assert.throws(
   /earn source is on cooldown/
 );
 
+const cultivationProgress = JSON.parse(harness.registeredRpcs.get("secondspawn_cultivation_event")(
+  { userId: "user-1", env: {} },
+  harness.logger,
+  harness.nk,
+  JSON.stringify({
+    id: "cultivation-1",
+    source: "prototype_nibirium_absorb",
+    amount_xp: 500
+  })
+));
+assert.equal(cultivationProgress.body.cultivation.tier, "Awakening");
+assert.equal(cultivationProgress.body.cultivation.progress_xp, 500);
+assert.equal(cultivationProgress.body.agent_activity[0].kind, "cultivation");
+
+const retriedCultivation = JSON.parse(harness.registeredRpcs.get("secondspawn_cultivation_event")(
+  { userId: "user-1", env: {} },
+  harness.logger,
+  harness.nk,
+  JSON.stringify({
+    id: "cultivation-1",
+    source: "prototype_nibirium_absorb",
+    amount_xp: 500
+  })
+));
+assert.equal(retriedCultivation.body.cultivation.progress_xp, 500);
+assert.equal(retriedCultivation.body.agent_activity.filter((activity) => activity.id === "cultivation-1").length, 1);
+
+const cultivationPromotion = JSON.parse(harness.registeredRpcs.get("secondspawn_cultivation_event")(
+  { userId: "user-1", env: {} },
+  harness.logger,
+  harness.nk,
+  JSON.stringify({
+    id: "cultivation-2",
+    source: "prototype_nibirium_absorb",
+    amount_xp: 500
+  })
+));
+assert.equal(cultivationPromotion.body.cultivation.tier, "Enhancement");
+assert.equal(cultivationPromotion.body.cultivation.progress_xp, 0);
+assert.equal(cultivationPromotion.body.agent_activity[0].metrics.cultivation_promoted, 1);
+assert.throws(
+  () => harness.registeredRpcs.get("secondspawn_cultivation_event")(
+    { userId: "user-1", env: {} },
+    harness.logger,
+    harness.nk,
+    JSON.stringify({
+      source: "unknown_source",
+      amount_xp: 100
+    })
+  ),
+  /cultivation source is not allowed/
+);
+
 const storedProfile = harness.storage.get(storageKey("user-1", "secondspawn_agent", "context"));
 delete storedProfile.value.body.agent_runtime;
 delete storedProfile.value.body.agent_activity;
@@ -454,6 +510,18 @@ const drainedBodyTime = JSON.parse(bodyTimeDeathHarness.registeredRpcs.get("seco
 assert.equal(drainedBodyTime.body.time.remaining_seconds, 0);
 assert.equal(drainedBodyTime.body.lifecycle, "dead");
 assert.match(drainedBodyTime.body.agent_activity[0].summary, /died/);
+assert.throws(
+  () => bodyTimeDeathHarness.registeredRpcs.get("secondspawn_cultivation_event")(
+    { userId: "bodytime-death-user", env: {} },
+    bodyTimeDeathHarness.logger,
+    bodyTimeDeathHarness.nk,
+    JSON.stringify({
+      source: "prototype_nibirium_absorb",
+      amount_xp: 100
+    })
+  ),
+  /dead bodies cannot progress cultivation/
+);
 assert.throws(
   () => bodyTimeDeathHarness.registeredRpcs.get("secondspawn_bodytime_event")(
     { userId: "bodytime-death-user", env: {} },