Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card is used to Ritual Summon "Dark Master - Zorc". You must also Tribute monsters from your hand or field whose total Levels equal 8 or more.
--闇の支配者との契約
--Contract with the Dark Master
local s,id=GetID()
function s.initial_effect(c)
	Ritual.AddProcGreaterCode(c,8,nil,97642679)
end