Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
2 Level 8 monsters This card can attack your opponent directly while it has Xyz Material. When this card inflicts battle damage to your opponent: You can target 1 face-up monster your opponent controls; destroy it. Once per turn, during either player's turn, when a Spell/Trap Card, or another monster's effect, is activated: Detach 1 Xyz Material from this card; negate the activation.
--No.23 冥界の霊騎士ランスロット
--Number 23: Lancelot, Dark Knight of the Underworld
local s,id=GetID()
function s.initial_effect(c)
	--Xyz summon
	Xyz.AddProcedure(c,nil,8,2)
	c:EnableReviveLimit()
	--Direct attack
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_DIRECT_ATTACK)
	e1:SetCondition(s.dacon)
	c:RegisterEffect(e1)
	--Destroy
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetCode(EVENT_BATTLE_DAMAGE)
	e2:SetCondition(s.descon)
	e2:SetTarget(s.destg)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
	--Negate
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_NEGATE)
	e3:SetType(EFFECT_TYPE_QUICK_F)
	e3:SetCode(EVENT_CHAINING)
	e3:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DAMAGE_CAL)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1)
	e3:SetCondition(s.discon)
	e3:SetCost(Cost.DetachFromSelf(1))
	e3:SetTarget(s.distg)
	e3:SetOperation(s.disop)
	c:RegisterEffect(e3)
	aux.DoubleSnareValidity(c,LOCATION_MZONE)
end
s.xyz_number=23
function s.dacon(e)
	return e:GetHandler():GetOverlayCount()>0
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	return ep==1-tp
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(1-tp) and chkc:IsLocation(LOCATION_MZONE) and chkc:IsFaceup() end
	if chk==0 then return Duel.IsExistingTarget(Card.IsFaceup,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,Card.IsFaceup,tp,0,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,1,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) and tc:IsFaceup() then
		Duel.Destroy(tc,REASON_EFFECT)
	end
end
function s.discon(e,tp,eg,ep,ev,re,r,rp)
	return (re:IsHasType(EFFECT_TYPE_ACTIVATE) or re:IsMonsterEffect())
		and re:GetHandler()~=e:GetHandler()
end
function s.distg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_NEGATE,eg,1,0,0)
end
function s.disop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.NegateActivation(ev) and re:IsHasType(EFFECT_TYPE_ACTIVATE) and re:GetHandler():IsRelateToEffect(re) then
		Duel.SendtoGrave(eg,REASON_EFFECT)
	end
end