--Untergang
function c400013.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOGRAVE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(function(e,tp) return Duel.IsExistingMatchingCard(aux.AND(Card.IsFaceup,Card.IsSetCard),tp,LOCATION_MZONE,0,1,nil,0x246) end)
	e1:SetTarget(c400013.target)
	e1:SetOperation(c400013.activate)
	e1:SetCountLimit(1,400013+EFFECT_COUNT_CODE_OATH)
	c:RegisterEffect(e1)
end
function c400013.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsAbleToGrave,tp,0,LOCATION_MZONE,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,nil,1,1-tp,LOCATION_MZONE)
end
function c400013.filter(c)
	return c:IsSetCard(0x246) and c:IsAbleToHand()
end
function c400013.activate(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,Card.IsAbleToGrave,tp,0,LOCATION_MZONE,1,1,nil)
	if g:GetCount()>0 then
		if Duel.SendtoGrave(g,REASON_EFFECT)==0 then return end
		local mg=Duel.GetMatchingGroup(aux.NecroValleyFilter(c400013.filter),tp,LOCATION_GRAVE,0,nil)
		if mg:GetCount()>0 and Duel.IsExistingMatchingCard(function(c)return c:IsSetCard(0x246) and c:IsType(TYPE_QUICKPLAY) and c:GetCode()~=400013 end,tp,LOCATION_GRAVE,0,1,nil)
		and Duel.SelectYesNo(tp,aux.Stringid(400010,0)) then
			Duel.BreakEffect()
			Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
			local sg=mg:Select(tp,1,1,nil)
			Duel.SendtoHand(sg,nil,REASON_EFFECT)
			Duel.ConfirmCards(1-tp,sg)
		end
	end
end