Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card attacks a Defense Position monster while equipped with a Dragon "Dragunity" monster, inflict piercing battle damage.
--ドラグニティ－アングス
--Dragunity Angusticlavii
local s,id=GetID()
function s.initial_effect(c)
	--pierce
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_PIERCE)
	e1:SetCondition(s.pcon)
	c:RegisterEffect(e1)
end
s.listed_series={SET_DRAGUNITY}
function s.pcon(e)
	return e:GetHandler():GetEquipGroup():IsExists(Card.IsSetCard,1,nil,SET_DRAGUNITY)
end