Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
"Cyber Dragon" + "Cyber Dragon" + "Cyber Dragon" A Fusion Summon of this card can only be done with the above Fusion Materials. If this card attacks a Defense Position monster, inflict piercing battle damage.
--サイバー・エンド・ドラゴン
--Cyber End Dragon
local s,id=GetID()
function s.initial_effect(c)
	--fusion material
	c:EnableReviveLimit()
	Fusion.AddProcMixN(c,false,false,CARD_CYBER_DRAGON,3)
	--pierce
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_PIERCE)
	c:RegisterEffect(e2)
end
s.material_setcode={SET_CYBER,SET_CYBER_DRAGON}