diff --git a/data-otservbr-global/scripts/quests/ferumbras_ascension/creaturescripts_bosses_kill.lua b/data-otservbr-global/scripts/quests/ferumbras_ascension/creaturescripts_bosses_kill.lua
index 2c162c243c8..2c9515d9786 100644
--- a/data-otservbr-global/scripts/quests/ferumbras_ascension/creaturescripts_bosses_kill.lua
+++ b/data-otservbr-global/scripts/quests/ferumbras_ascension/creaturescripts_bosses_kill.lua
@@ -67,10 +67,18 @@ local crystals = {
 }
 
 local function transformCrystal(player)
+	if type(player) ~= "userdata" or not player:isPlayer() then
+		print("[Error] transformCrystal: invalid player argument")
+		return
+	end
+
 	for c = 1, #crystals do
 		local crystal = crystals[c]
 		player:setStorageValue(crystal.globalStorage, 0)
+		Game.setStorageValue(crystal.globalStorage, 0)
 		player:setStorageValue(Storage.Quest.U10_90.FerumbrasAscension.Crystals.AllCrystals, 0)
+		Game.setStorageValue(Storage.Quest.U10_90.FerumbrasAscension.Crystals.AllCrystals, 0)
+
 		local item = Tile(crystal.crystalPosition):getItemById(14961)
 		if item then
 			item:transform(14955)
@@ -110,22 +118,31 @@ function ascendantBossesKill.onDeath(creature)
 			local cooldownTime = bossConfig.cooldown * 3600
 			local nextAvailableTime = os.time() + cooldownTime
 			player:setStorageValue(bossConfig.storage, nextAvailableTime)
+
 			local cooldownMessage = formatCooldownMessage(bossConfig.cooldown)
 			player:sendTextMessage(MESSAGE_EVENT_ADVANCE, "You have defeated " .. bossName .. ". You can challenge this boss again in " .. cooldownMessage .. ".")
 		end
 	end)
 
+	-- Handle teleport transformation
 	local teleport = Tile(bossConfig.teleportPos):getItemById(1949)
 	if teleport then
 		teleport:transform(22761)
 		teleport:getPosition():sendMagicEffect(CONST_ME_THUNDER)
 		teleport:setDestination(bossConfig.godbreakerPos)
+
 		addEvent(revertTeleport, 1 * 60 * 1000, bossConfig.teleportPos, 22761, 1949, Position(33319, 32318, 13))
 	end
 
+	-- Special case for Ferumbras Mortal Shell
 	if creature:getName():lower() == "ferumbras mortal shell" then
 		onDeathForDamagingPlayers(creature, function(creature, player)
-			addEvent(transformCrystal, 2 * 60 * 1000, player)
+			addEvent(function(playerId)
+				local player = Player(playerId)
+				if player then
+					transformCrystal(player)
+				end
+			end, 2 * 60 * 1000, player:getId())
 		end)
 	end
 
diff --git a/data-otservbr-global/scripts/quests/ferumbras_ascension/creaturescripts_rift_invader_death.lua b/data-otservbr-global/scripts/quests/ferumbras_ascension/creaturescripts_rift_invader_death.lua
index ecd56ef0467..b9d86f05071 100644
--- a/data-otservbr-global/scripts/quests/ferumbras_ascension/creaturescripts_rift_invader_death.lua
+++ b/data-otservbr-global/scripts/quests/ferumbras_ascension/creaturescripts_rift_invader_death.lua
@@ -23,26 +23,26 @@ function riftInvaderDeath.onDeath(creature, corpse, lasthitkiller, mostdamagekil
 	for i = 1, #crystals do
 		local crystal = crystals[i]
 		if creature:getPosition():isInRange(crystal.fromPosition, crystal.toPosition) then
-			if player:getStorageValue(crystal.globalStorage) > 8 then
+			if Game.getStorageValue(crystal.globalStorage) > 8 then
 				local item = Tile(crystal.crystalPosition):getItemById(14955)
 				if not item then
 					return true
 				end
 				item:transform(14961)
-				player:setStorageValue(Storage.Quest.U10_90.FerumbrasAscension.Crystals.AllCrystals, player:getStorageValue(Storage.Quest.U10_90.FerumbrasAscension.Crystals.AllCrystals) + 1)
+				Game.setStorageValue(Storage.Quest.U10_90.FerumbrasAscension.Crystals.AllCrystals, Game.getStorageValue(Storage.Quest.U10_90.FerumbrasAscension.Crystals.AllCrystals) + 1)
 			end
-			if player:getStorageValue(Storage.Quest.U10_90.FerumbrasAscension.Crystals.AllCrystals) == 8 then
+			if Game.getStorageValue(Storage.Quest.U10_90.FerumbrasAscension.Crystals.AllCrystals) == 8 then
 				local creature = Tile(config.bossPos):getTopCreature()
 				creature:say("NOOOOOOOOOOO!", TALKTYPE_MONSTER_YELL)
 				creature:say("FERUMBRAS BURSTS INTO SOUL SPLINTERS!", TALKTYPE_MONSTER_YELL, nil, nil, Position(33392, 31475, 14))
 				creature:remove()
 				for a = 1, #crystals do
-					local crystalEffect = crystals[i]
+					local crystalEffect = crystals[a]
 					crystalEffect.crystalPosition:sendMagicEffect(CONST_ME_FERUMBRAS)
 					Game.createMonster("Ferumbras Soul Splinter", Position(33392, 31473, 14), false, true)
 				end
 			end
-			player:setStorageValue(crystal.globalStorage, player:getStorageValue(crystal.globalStorage) + 1)
+			Game.setStorageValue(crystal.globalStorage, Game.getStorageValue(crystal.globalStorage) + 1)
 			lasthitkiller:say("The negative energy of the rift creature is absorbed by the crystal!", TALKTYPE_MONSTER_SAY, nil, nil, crystal.crystalPosition)
 			lasthitkiller:say("ARGH!", TALKTYPE_MONSTER_SAY, nil, nil, Position(33392, 31473, 14))
 		end
diff --git a/data-otservbr-global/scripts/quests/ferumbras_ascension/movements_vortex.lua b/data-otservbr-global/scripts/quests/ferumbras_ascension/movements_vortex.lua
index 6a001370f7c..c89c03e6411 100644
--- a/data-otservbr-global/scripts/quests/ferumbras_ascension/movements_vortex.lua
+++ b/data-otservbr-global/scripts/quests/ferumbras_ascension/movements_vortex.lua
@@ -10,8 +10,8 @@ function vortex.onStepIn(creature, item, position, fromPosition)
 
 	monster:remove()
 	position:sendMagicEffect(CONST_ME_POFF)
-	player:setStorageValue(Storage.Quest.U10_90.FerumbrasAscension.FerumbrasEssence, player:getStorageValue(Storage.Quest.U10_90.FerumbrasAscension.FerumbrasEssence) + 1)
-	if player:getStorageValue(Storage.Quest.U10_90.FerumbrasAscension.FerumbrasEssence) >= 8 then
+	Game.setStorageValue(Storage.Quest.U10_90.FerumbrasAscension.FerumbrasEssence, Game.getStorageValue(Storage.Quest.U10_90.FerumbrasAscension.FerumbrasEssence) + 1)
+	if Game.getStorageValue(Storage.Quest.U10_90.FerumbrasAscension.FerumbrasEssence) >= 8 then
 		Game.createMonster("Destabilized Ferumbras", config.bossPos, true, true)
 		for i = 1, config.maxSummon do
 			Game.createMonster("Rift Fragment", Position(math.random(33381, 33403), math.random(31462, 31483), 14), true, true)