Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During the Main Phase: Target 1 "Drytron" monster or 1 Ritual Monster you control, and 1 face-up monster your opponent controls; your monster loses exactly 1000 ATK until the end of your opponent's turn, and if it does, destroy that opponent's monster. You can only activate 1 "Drytron Asterism" per turn.
--星彩の竜輝巧
--Drytron Asterism
--Scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DESTROY+CATEGORY_ATKCHANGE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER|TIMING_MAIN_END)
	e1:SetCondition(s.descond)
	e1:SetTarget(s.destg)
	e1:SetOperation(s.desop)
	c:RegisterEffect(e1)
end
s.listed_series={SET_DRYTRON}
function s.descond()
	return Duel.IsMainPhase()
end
function s.atkfilter(c)
	return c:IsFaceup() and c:GetAttack()>=1000 and (c:IsSetCard(SET_DRYTRON) or c:IsRitualMonster())
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return false end
	if chk==0 then return Duel.IsExistingTarget(s.atkfilter,tp,LOCATION_MZONE,0,1,nil)
		and Duel.IsExistingTarget(Card.IsFaceup,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATKDEF)
	local g1=Duel.SelectTarget(tp,s.atkfilter,tp,LOCATION_MZONE,0,1,1,nil)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g2=Duel.SelectTarget(tp,Card.IsFaceup,tp,0,LOCATION_MZONE,1,1,nil)
	e:SetLabelObject(g1:GetFirst())
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g2,1,0,LOCATION_MZONE)
	Duel.SetOperationInfo(0,CATEGORY_ATKCHANGE,g1,1,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local tc=e:GetLabelObject()
	local g=Duel.GetTargetCards(e)
	local dc=g:GetFirst()
	if dc==tc then dc=g:GetNext() end
	if tc and tc:UpdateAttack(-1000,RESETS_STANDARD_PHASE_END|RESET_OPPO_TURN,c)==-1000 and dc and dc:IsControler(1-tp) and not dc:IsFacedown() then
		 Duel.Destroy(dc,REASON_EFFECT)
	end
end