Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Activate this card by targeting 1 face-up monster your opponent controls; it loses 700 ATK, also it cannot attack or change its battle position. When it leaves the field, destroy this card.
--闇の呪縛
--Shadow Spell
local s,id=GetID()
function s.initial_effect(c)
	aux.AddPersistentProcedure(c,1,aux.FilterBoolFunction(Card.IsFaceup),CATEGORY_POSITION,EFFECT_FLAG_DAMAGE_STEP,TIMING_DAMAGE_STEP,TIMING_DAMAGE_STEP,aux.StatChangeDamageStepCondition)
	--eff
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CANNOT_CHANGE_POSITION)
	e1:SetRange(LOCATION_SZONE)
	e1:SetTargetRange(LOCATION_MZONE,LOCATION_MZONE)
	e1:SetTarget(aux.PersistentTargetFilter)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_CANNOT_ATTACK)
	c:RegisterEffect(e2)
	local e3=e1:Clone()
	e3:SetCode(EFFECT_UPDATE_ATTACK)
	e3:SetValue(-700)
	c:RegisterEffect(e3)
	--Destroy
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_CONTINUOUS+EFFECT_TYPE_FIELD)
	e4:SetRange(LOCATION_SZONE)
	e4:SetCode(EVENT_LEAVE_FIELD)
	e4:SetCondition(s.descon)
	e4:SetOperation(s.desop)
	c:RegisterEffect(e4)
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsStatus(STATUS_DESTROY_CONFIRMED) then return false end
	local tc=c:GetFirstCardTarget()
	return tc and eg:IsContains(tc)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Destroy(e:GetHandler(),REASON_EFFECT)
end