Edited itemInfo.lua to supports multi itemInfo files. Guide: https://pservero.com/multi-iteminfo-files-with-costume-slots-name-fixes-from-item_db/

itemInfo.lua

main = function()
	iiFiles = {
		"System/itemInfo_Translation.lua", -- 1st priority
		"System/itemInfo_kRO.lua", -- 2nd
		"System/itemInfo_idRO.lua", -- 3rd
		"System/itemInfo_iRO.lua", -- 4th
		"System/itemInfo_misc.lua", -- 5th
		"System/itemInfo_ItemDB.lua", -- Fixes!
	}

	_TempItems = {}

	-- check existing item
	function CheckItem(ItemID, DESC, flag)
		if not (DESC.costume) then
			DESC.costume = false
		end
		if not (_TempItems[ItemID]) then
			_TempItems[ItemID] = DESC
		else
			myTbl = {}
			-- remap
			for pos,val in pairs(_TempItems[ItemID]) do
				myTbl[pos] = val
			end
			-- add data if not exists yet
			for pos,val in pairs(DESC) do
				if not (myTbl[pos]) or myTbl[pos] == "" then
					myTbl[pos] = val
				end
			end
			-- use ClassNum from this itemInfo to fix attack sprite animation
			if flag == true and DESC.ClassNum then
				if not (_TempItems[ItemID].ClassNum) or _TempItems[ItemID].ClassNum == 0 then
					myTbl["ClassNum"] = DESC.ClassNum
				end
			end
			_TempItems[ItemID] = myTbl
		end
	end
	-- end check

	-- Set some fixes
	function setDESC(ItemID,DESC)
		if _TempItems[ItemID] then
			if DESC.costume then
				_TempItems[ItemID].costume = DESC.costume
			end
			if DESC.slotCount then
				_TempItems[ItemID].slotCount = DESC.slotCount
			end
			if DESC.identifiedDisplayName then
				_TempItems[ItemID].identifiedDisplayName = DESC.identifiedDisplayName
			end
		end
	end
	-- Set some fixes

	-- Read all files
	for i,iiFile in pairs(iiFiles) do
		d = dofile(iiFile)
	end
	-- Read all files

	-- process _TempItems
	for ItemID,DESC in pairs(_TempItems) do
		result, msg = AddItem(ItemID, DESC.unidentifiedDisplayName, DESC.unidentifiedResourceName, DESC.identifiedDisplayName, DESC.identifiedResourceName, DESC.slotCount, DESC.ClassNum, DESC.costume)
		if not result then
			return false, msg
		end
		for k,v in pairs(DESC.unidentifiedDescriptionName) do
			result, msg = AddItemUnidentifiedDesc(ItemID, v)
			if not result then
				return false, msg
			end
		end
		for k,v in pairs(DESC.identifiedDescriptionName) do
			result, msg = AddItemIdentifiedDesc(ItemID, v)
			if not result then
				return false, msg
			end
		end
	end
	-- process _TempItems

	_TempItems = nil

	return true, "good"
end