Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Special Summon this card (from your hand) by Tributing 1 "Airknight Parshath". If this card attacks a Defense Position monster, inflict piercing battle damage. If this card inflicts battle damage to your opponent: Draw 1 card. While "The Sanctuary in the Sky" is on the field and your LP is higher than your opponent's, this card gains ATK/DEF equal to the difference in LP.
--天空勇士ネオパーシアス
--Neo-Parshath, the Sky Paladin
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--draw
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DRAW)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_BATTLE_DAMAGE)
	e2:SetCondition(s.condition)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	--pierce
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE)
	e3:SetCode(EFFECT_PIERCE)
	c:RegisterEffect(e3)
	--update atk,def
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_SINGLE)
	e4:SetCode(EFFECT_UPDATE_ATTACK)
	e4:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e4:SetRange(LOCATION_MZONE)
	e4:SetValue(s.val)
	c:RegisterEffect(e4)
	local e5=e4:Clone()
	e5:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e5)
end
s.listed_names={18036057,CARD_SANCTUARY_SKY}
function s.spcon(e,c)
	if c==nil then return true end
	return Duel.CheckReleaseGroup(c:GetControler(),Card.IsCode,1,false,1,true,c,c:GetControler(),nil,false,nil,18036057)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,c)
	local g=Duel.SelectReleaseGroup(tp,Card.IsCode,1,1,false,true,true,c,nil,nil,false,nil,18036057)
	if g then
		g:KeepAlive()
		e:SetLabelObject(g)
		return true
	end
	return false
end
function s.spop(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.Release(g,REASON_COST)
	g:DeleteGroup()
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return ep==1-tp
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end
function s.val(e,c)
	if not (Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsCode,CARD_SANCTUARY_SKY),e:GetHandlerPlayer(),LOCATION_ONFIELD,LOCATION_ONFIELD,1,nil)
		or Duel.IsEnvironment(CARD_SANCTUARY_SKY)) then return 0 end
	local v=Duel.GetLP(c:GetControler())-Duel.GetLP(1-c:GetControler())
	if v>0 then return v else return 0 end
end