--NREM Erebus
local cid,id=GetID()
function cid.initial_effect(c)
	c:EnableReviveLimit()
	--position change
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_POSITION)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_MZONE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCountLimit(1)
	e1:SetTarget(cid.postg)
	e1:SetOperation(cid.posop)
	c:RegisterEffect(e1)
	--double battle damage
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE)
	e3:SetCode(EFFECT_CHANGE_BATTLE_DAMAGE)
	e3:SetCondition(cid.damcon)
	e3:SetValue(aux.ChangeBattleDamage(1,DOUBLE_DAMAGE))
	c:RegisterEffect(e3)
	--chain attack
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_BATTLE_DESTROYING)
	e2:SetCondition(cid.atcon)
	e2:SetOperation(cid.atop)
	c:RegisterEffect(e2)
	--Search Nightmare
	local e9=Effect.CreateEffect(c)
	e9:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e9:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e9:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DELAY)
	e9:SetCode(EVENT_RELEASE)
	e9:SetTarget(cid.sptg)
	e9:SetOperation(cid.spop)
	c:RegisterEffect(e9)
end
function cid.damcon(e)
	return e:GetHandler():GetBattleTarget()~=nil
end
function cid.atcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return aux.bdcon(e,tp,eg,ep,ev,re,r,rp) and c:IsChainAttackable()
end
function cid.atop(e,tp,eg,ep,ev,re,r,rp)
	Duel.ChainAttack()
end
function cid.filter(c)
	return c:IsCanChangePosition()
end
function cid.postg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and cid.filter(chkc) end
	if chk==0 then return true end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_POSCHANGE)
	local g=Duel.SelectTarget(tp,cid.filter,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,g:GetCount(),0,0)
end
function cid.posop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.ChangePosition(tc,POS_FACEUP_DEFENSE,POS_FACEDOWN_DEFENSE,POS_FACEUP_ATTACK,POS_FACEUP_ATTACK)
	end
end
function cid.filter(c)
	return c:IsSetCard(0x505) and c:IsAbleToHand()
end
function cid.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(cid.filter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function cid.spop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectMatchingCard(tp,cid.filter,tp,LOCATION_DECK,0,1,1,nil)
	if g:GetCount()>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
	end
end