Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card is used to Ritual Summon "Fiend's Mirror". You must also Tribute monsters from the field or your hand whose total Levels equal 6 or more.
--悪魔鏡の儀式
--Beastly Mirror Ritual
local s,id=GetID()
function s.initial_effect(c)
	Ritual.AddProcGreaterCode(c,6,nil,31890399)
end