Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 "D/D/D" monster + 1 "D/D" monster If a "D/D" monster you control attacks a Defense Position monster, inflict piercing battle damage to your opponent. Once per turn, during your Standby Phase: You can destroy all cards in the Spell & Trap Zones.
--DDD剋竜王ベオウルフ
--D/D/D Dragonbane King Beowulf
local s,id=GetID()
function s.initial_effect(c)
	--fusion material
	c:EnableReviveLimit()
	Fusion.AddProcMix(c,true,true,aux.FilterBoolFunctionEx(Card.IsSetCard,SET_DDD),aux.FilterBoolFunctionEx(Card.IsSetCard,SET_DD))
	--pierce
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_PIERCE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTargetRange(LOCATION_MZONE,0)
	e1:SetTarget(aux.TargetBoolFunction(Card.IsSetCard,SET_DD))
	c:RegisterEffect(e1)
	--destroy
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCode(EVENT_PHASE|PHASE_STANDBY)
	e2:SetCountLimit(1)
	e2:SetCondition(s.descon)
	e2:SetTarget(s.destg)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
end
s.material_setcode={SET_DD,SET_DDD}
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(tp)
end
function s.filter(c)
	return c:GetSequence()<5
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_SZONE,LOCATION_SZONE,1,nil) end
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_SZONE,LOCATION_SZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_SZONE,LOCATION_SZONE,nil)
	Duel.Destroy(g,REASON_EFFECT)
end