Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 DARK Tuner + 1 non-Tuner Dragon-Type monster Cannot be destroyed by battle. When this card destroys an opponent's monster by battle and sends it to the Graveyard: You can activate this effect; this card can make a second attack on an opponent's monster in a row. During your Standby Phase: You can target 1 face-up monster your opponent controls; its ATK becomes half its current ATK, and if it does, inflict damage to your opponent equal to that lost ATK.
--冥界濁龍 ドラゴキュートス
--Dragocytos Corrupted Nethersoul Dragon
local s,id=GetID()
function s.initial_effect(c)
	--synchro summon
	Synchro.AddProcedure(c,aux.FilterBoolFunctionEx(Card.IsAttribute,ATTRIBUTE_DARK),1,1,Synchro.NonTunerEx(Card.IsRace,RACE_DRAGON),1,1)
	c:EnableReviveLimit()
	--battle indestructable
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e1:SetValue(1)
	c:RegisterEffect(e1)
	--chain attack
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_BATTLE_DESTROYING)
	e2:SetCondition(s.atcon)
	e2:SetOperation(s.atop)
	c:RegisterEffect(e2)
	--damage
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_DAMAGE)
	e3:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e3:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCode(EVENT_PHASE|PHASE_STANDBY)
	e3:SetCountLimit(1)
	e3:SetCondition(s.damcon)
	e3:SetTarget(s.damtg)
	e3:SetOperation(s.damop)
	c:RegisterEffect(e3)
end
function s.atcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	return bc:IsLocation(LOCATION_GRAVE) and bc:IsMonster() and c:CanChainAttack(2,true) and c:IsStatus(STATUS_OPPO_BATTLE)
end
function s.atop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not c:IsRelateToBattle() then return end
	Duel.ChainAttack()
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_CANNOT_DIRECT_ATTACK)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
	e1:SetReset(RESET_EVENT|RESETS_STANDARD|RESET_PHASE|PHASE_BATTLE)
	c:RegisterEffect(e1)
end
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(tp)
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1-tp) and chkc:HasNonZeroAttack() end
	if chk==0 then return Duel.IsExistingTarget(Card.HasNonZeroAttack,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=Duel.SelectTarget(tp,Card.HasNonZeroAttack,tp,0,LOCATION_MZONE,1,1,nil)
	local atk=g:GetFirst():GetAttack()
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,atk/2)
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) and not tc:IsImmuneToEffect(e) then
		local atk=tc:GetAttack()
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		e1:SetValue(atk/2)
		tc:RegisterEffect(e1)
		Duel.Damage(1-tp,atk/2,REASON_EFFECT)
	end
end