Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If a Fiend monster you control battles, during the Damage Step: Pay LP in multiples of 100, then target the opponent's battling monster; that opponent's monster loses that much ATK and DEF, until the end of this turn.
--冥王の咆哮
--Bark of Dark Ruler
local s,id=GetID()
function s.initial_effect(c)
	--atkdown
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(TIMING_DAMAGE_STEP)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetCondition(s.condition)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	local phase=Duel.GetCurrentPhase()
	if phase~=PHASE_DAMAGE or Duel.IsDamageCalculated() then return false end
	local a=Duel.GetAttacker()
	local d=Duel.GetAttackTarget()
	if a:IsControler(tp) then 
		e:SetLabelObject(d)
		return a:IsFaceup() and a:IsRace(RACE_FIEND) and a:IsRelateToBattle()
			and d and d:IsFaceup() and d:IsRelateToBattle()
	elseif d and d:IsControler(tp) then
		e:SetLabelObject(a)
		return d:IsFaceup() and d:IsRace(RACE_FIEND) and d:IsRelateToBattle()
			and a and a:IsFaceup() and a:IsRelateToBattle()
	end
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	e:SetLabel(1)
	if chk==0 then return true end
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	local tc=e:GetLabelObject()
	if chkc then return chkc==tc end
	if chk==0 then
		if e:GetLabel()~=1 then return false end
		e:SetLabel(0)
		return Duel.CheckLPCost(tp,100) and (tc:IsAttackAbove(100) or tc:IsDefenseAbove(100)) and tc:IsCanBeEffectTarget(e) end
	local maxc=Duel.GetLP(tp)
	local maxpay=tc:GetAttack()
	local def=tc:GetDefense()
	if maxpay<def then maxpay=def end
	if maxpay<maxc then maxc=maxpay end
	if maxc>5000 then maxc=5000 end
	maxc=math.floor(maxc/100)*100
	local t={}
	for i=1,maxc/100 do
		t[i]=i*100
	end
	local cost=Duel.AnnounceNumber(tp,table.unpack(t))
	Duel.PayLPCost(tp,cost)
	Duel.SetTargetCard(tc)
	Duel.SetTargetParam(cost)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp,chk)
	local bc=Duel.GetFirstTarget()
	local val=Duel.GetChainInfo(0,CHAININFO_TARGET_PARAM)
	if not bc or not bc:IsRelateToEffect(e) or not bc:IsControler(1-tp) then return end
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetValue(-val)
	e1:SetReset(RESETS_STANDARD_PHASE_END)
	bc:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_UPDATE_DEFENSE)
	bc:RegisterEffect(e2)
end