diff --git a/changelog.txt b/changelog.txt
index f63f9af86..b960c45fd 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -25,10 +25,22 @@ Additions:
 		Called after a player drops a card/pill onto the ground from their inventory.
 	- MC_PRE_PLAYER_GIVE_BIRTH_CAMBION/IMMACULATE (EntityPlayer, CambionFamiliarFlag)
 		Return false to cancel the familiar being added.
+	- MC_POST_CYCLE_RATE_CALCULATE (EntityPickup, int CycleNum, int OriginalRate)
+		Called after the rate at which a collectible is supposed to cycle is calculated (Glitched Crown effect)
+		Return integer to overwrite cycle rate.
 * EntityLaser:
 	- GetDamageMultiplier()
 	- SetDamageMultiplier(float Mult)
+* ItemPool:
+	- GetRandomPool(RNG, bool AdvancedSearch, table BlackList)
+	- PickCollectible(ItemPoolType, bool Decrease, RNG, GetCollectibleFlag)
+* RNG:
+	- GetShiftIdx()
+	- PhantomNext()
+	- Previous()
+	- PhantomPrevious()
 * Enums:
+	- GetCollectibleFlag
 	- CambionFamiliarFlag
 * Added a new option "Extra debug render for FindInRadius". While the DebugFlag.HITSPHERES flag is enabled, debug spheres will be rendered for FindInRadius/QueryRadius calls.
 /newline/
@@ -37,6 +49,8 @@ Modified:
 	PlayCutscene(CutsceneID, ClearGameState = false)
 * Game:
 	SetDizzyAmount(TargetIntensity, CurrentIntensity) - Providing CurrentIntensity is now optional
+* ItemPool:
+	GetCollectible(ItemPoolType, Decrease, Seed, DefaultItem, Flags) - Now gives access to the hidden flags
 * The game no longer prematurely ends the daily run if there was console input, instead blocking it
 /newline/
 Fixes:
diff --git a/repentogon/Patches/ASMPatches.cpp b/repentogon/Patches/ASMPatches.cpp
index 5f5b68d63..f229c33bc 100644
--- a/repentogon/Patches/ASMPatches.cpp
+++ b/repentogon/Patches/ASMPatches.cpp
@@ -95,6 +95,7 @@ void PerformASMPatches() {
 	ASMPatchProjectileDeath();
 	ASMPatchTearDeath();
 	ASMPatchPrePlayerGiveBirth();
+	ASMPatchPostCycleRateCalculate();
 
 	// Delirium
 	delirium::AddTransformationCallback();
diff --git a/repentogon/Patches/ASMPatches/ASMCallbacks.cpp b/repentogon/Patches/ASMPatches/ASMCallbacks.cpp
index d292ea7fa..b5627bdc4 100644
--- a/repentogon/Patches/ASMPatches/ASMCallbacks.cpp
+++ b/repentogon/Patches/ASMPatches/ASMCallbacks.cpp
@@ -1084,3 +1084,57 @@ void ASMPatchPrePlayerGiveBirth() {
 	printf("[REPENTOGON] Patching Entity_Player::TriggerHeartPickedUp at %p for MC_PRE_PLAYER_GIVE_BIRTH_IMMACULATE\n", immaculateAddr);
 	PreBirthPatch(immaculateAddr, false);  // Immaculate
 }
+
+// MC_POST_CYCLE_RATE_CALCULATE(1211)
+uint32_t __stdcall RunPostCycleRateCalculate(Entity_Pickup* collectible, uint32_t originalCycleRate) {
+	uint32_t cycleRate = originalCycleRate;
+
+	const int callbackid = 1211;
+	if (!CallbackState.test(callbackid - 1000)) {
+		return originalCycleRate;
+	}
+
+	lua_State* L = g_LuaEngine->_state;
+	lua::LuaStackProtector protector(L);
+	lua::LuaCaller caller(L);
+
+	lua_rawgeti(L, LUA_REGISTRYINDEX, g_LuaEngine->runCallbackRegistry->key);
+
+	lua::LuaResults failure = lua::LuaCaller(L).push(callbackid)
+	.push(collectible->_cycleCollectibleCount)
+	.push(collectible, lua::Metatables::ENTITY_PICKUP)
+	.push(collectible->_cycleCollectibleCount)
+	.push(originalCycleRate)
+	.call(1);
+
+	if (failure || !lua_isinteger(L, -1)) {
+		return originalCycleRate;
+	}
+
+	cycleRate = (uint32_t)lua_tointeger(L, -1);
+	if (cycleRate == 0) { // Since the game uses this number as a divisor a value of 0 would cause a Crash
+		cycleRate = 1;
+	}
+	return cycleRate;
+}
+
+void ASMPatchPostCycleRateCalculate() {
+	SigScan scanner("837f??0075??c787????????00000000");
+	scanner.Scan();
+	void* cycleSig = scanner.GetAddress();
+
+	printf("[REPENTOGON] Patching Entity_Pickup::Update at %p for MC_POST_COLLECTIBLE_CYCLE_RATE_CALCULATE\n", cycleSig);
+
+	ASMPatch::SavedRegisters reg(ASMPatch::SavedRegisters::GP_REGISTERS_STACKLESS & ~ASMPatch::SavedRegisters::ECX, true);
+	ASMPatch patch;
+	patch.AddBytes(ByteBuffer().AddAny((char*)cycleSig, 0x4)) // check if subtype is 0
+        .AddConditionalRelativeJump(ASMPatcher::CondJumps::JE, (char*)cycleSig + 0x6) // return if subtype is 0
+        .PreserveRegisters(reg)
+        .Push(ASMPatch::Registers::ECX) // cycleRate
+        .Push(ASMPatch::Registers::EDI) // Entity_Pickup*
+		.AddInternalCall(RunPostCycleRateCalculate) // call RunPostCycleRateCalculate
+        .CopyRegister(ASMPatch::Registers::ECX, ASMPatch::Registers::EAX) // cycleRate = result
+		.RestoreRegisters(reg)
+		.AddRelativeJump((char*)cycleSig + 0x15);
+	sASMPatcher.PatchAt(cycleSig, &patch);
+}
diff --git a/repentogon/Patches/ASMPatches/ASMCallbacks.h b/repentogon/Patches/ASMPatches/ASMCallbacks.h
index 2637c2538..752c759d3 100644
--- a/repentogon/Patches/ASMPatches/ASMCallbacks.h
+++ b/repentogon/Patches/ASMPatches/ASMCallbacks.h
@@ -21,3 +21,4 @@ void ASMPatchPickupUpdatePickupGhosts();
 void ASMPatchProjectileDeath();
 void ASMPatchTearDeath();
 void ASMPatchPrePlayerGiveBirth();
+void ASMPatchPostCycleRateCalculate();
diff --git a/repentogon/resources/scripts/enums_ex.lua b/repentogon/resources/scripts/enums_ex.lua
index 2db80983f..5c4c55b49 100644
--- a/repentogon/resources/scripts/enums_ex.lua
+++ b/repentogon/resources/scripts/enums_ex.lua
@@ -173,6 +173,7 @@ ModCallbacks.MC_PLAYER_INIT_PRE_LEVEL_INIT_STATS = 1127
 ModCallbacks.MC_PRE_NEW_ROOM = 1200
 ModCallbacks.MC_PRE_MEGA_SATAN_ENDING = 1201
 ModCallbacks.MC_POST_MODS_LOADED = 1210
+ModCallbacks.MC_POST_CYCLE_RATE_CALCULATE = 1211
 ModCallbacks.MC_POST_ITEM_OVERLAY_SHOW = 1134
 ModCallbacks.MC_PRE_RENDER = 1135
 ModCallbacks.MC_PRE_OPENGL_RENDER = 1136