--NREM Cthulhu
local cid,id=GetID()
function cid.initial_effect(c)
	c:EnableReviveLimit()
	--attribute id
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_QUICK_O)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER+TIMING_END_PHASE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetTarget(cid.attg)
	e1:SetOperation(cid.atop)
	c:RegisterEffect(e1)
	--cannot attack
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_CANNOT_ATTACK)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTargetRange(0,LOCATION_MZONE)
	e2:SetTarget(cid.atktarget)
	c:RegisterEffect(e2)
	--Undo Nightmare
	local e9=Effect.CreateEffect(c)
	e9:SetCategory(CATEGORY_TODECK)
	e9:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e9:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DELAY)
	e9:SetCode(EVENT_RELEASE)
	e9:SetCondition(cid.target)
	e9:SetOperation(cid.activate)
	c:RegisterEffect(e9)
end
function cid.atktarget(e,c)
	return c:IsType(TYPE_SPIRIT)
end
function cid.rmfilter1(c,tp)
	return c:IsSetCard(0x505) and c:IsType(TYPE_MONSTER) and (c:IsLocation(LOCATION_GRAVE) or c:IsFaceup()) and c:IsAbleToRemove() and Duel.IsExistingMatchingCard(cid.rmfilter2,tp,0,LOCATION_MZONE,1,nil)
end
function cid.rmfilter2(c)
	return c:IsFaceup()
end
function cid.attg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE+LOCATION_GRAVE) and chkc:IsControler(tp) and cid.rmfilter1(chkc,tp) end
	if chk==0 then return Duel.IsExistingTarget(cid.rmfilter1,tp,LOCATION_MZONE+LOCATION_GRAVE,0,1,nil,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g1=Duel.SelectTarget(tp,cid.rmfilter1,tp,LOCATION_MZONE+LOCATION_GRAVE,0,1,1,nil,tp)
	local gr=false
	if g1:GetFirst():IsLocation(LOCATION_GRAVE) then gr=true end
	if gr then
		Duel.SetOperationInfo(0,CATEGORY_REMOVE,g1,g1:GetCount(),tp,LOCATION_GRAVE)
	else
		Duel.SetOperationInfo(0,CATEGORY_REMOVE,g1,g1:GetCount(),0,0)
	end
end
function cid.filter2(c)
	return c:IsFaceup()
end
function cid.atop(e,tp,eg,ep,ev,re,r,rp)
	local fc=Duel.GetFirstTarget()
	if fc and fc:IsRelateToEffect(e) then
		Duel.Remove(fc,POS_FACEUP,REASON_EFFECT)
	end
	local g=Duel.GetMatchingGroup(cid.filter2,tp,0,LOCATION_MZONE,nil)
	local tc=g:GetFirst()
	while tc do
		local c=e:GetHandler()
		local fid=c:GetFieldID()
		tc:RegisterFlagEffect(id,RESET_EVENT+RESETS_STANDARD,0,1,fid)
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
		e1:SetCode(EFFECT_ADD_TYPE)
		e1:SetValue(TYPE_SPIRIT)
		e1:SetReset(RESET_EVENT+RESETS_STANDARD)
		tc:RegisterEffect(e1)
		local e2=Effect.CreateEffect(c)
		e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
		e2:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE)
		e2:SetCode(EVENT_PHASE+PHASE_END)
		e2:SetCountLimit(1)
		e2:SetLabel(fid)
		e2:SetLabelObject(tc)
		e2:SetCondition(cid.retcon)
		e2:SetOperation(cid.retop)
		Duel.RegisterEffect(e2,tp)
		tc=g:GetNext()
	end
end
function cid.retcon(e,tp,eg,ep,ev,re,r,rp)
	if not (e:GetLabelObject():GetFlagEffectLabel(id)==e:GetLabel()) then
		e:Reset()
		return false
	else return true end
end
function cid.retop(e,tp,eg,ep,ev,re,r,rp)
	local tc=e:GetLabelObject()
	Duel.SendtoHand(tc,nil,REASON_EFFECT)
end
function cid.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsAbleToDeck,tp,LOCATION_REMOVED,LOCATION_REMOVED,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TODECK,nil,1,tp,LOCATION_REMOVED)
end
function cid.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetFieldGroup(tp,LOCATION_REMOVED,LOCATION_REMOVED)
	Duel.SendtoDeck(g,nil,2,REASON_EFFECT)
end