Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Activate this card by targeting an opponent's monster; equip this card to it. Take control of it. Destroy this card unless you control an "Archfiend" card. During each of your opponent's Standby Phases: You take 800 damage.
--堕落
--Falling Down
local s,id=GetID()
function s.initial_effect(c)
	aux.AddEquipProcedure(c,1,aux.CheckStealEquip,s.eqlimit,nil,s.target)
	--damage
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetCategory(CATEGORY_DAMAGE)
	e2:SetCode(EVENT_PHASE|PHASE_STANDBY)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1)
	e2:SetCondition(s.damcon)
	e2:SetTarget(s.damtg)
	e2:SetOperation(s.damop)
	c:RegisterEffect(e2)
	--
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE)
	e3:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e3:SetCode(EFFECT_SELF_DESTROY)
	e3:SetRange(LOCATION_SZONE)
	e3:SetCondition(s.descon)
	c:RegisterEffect(e3)
	--control
	local e5=Effect.CreateEffect(c)
	e5:SetType(EFFECT_TYPE_EQUIP)
	e5:SetCode(EFFECT_SET_CONTROL)
	e5:SetValue(s.ctval)
	c:RegisterEffect(e5)
end
s.listed_series={SET_ARCHFIEND}
function s.eqlimit(e,c)
	return e:GetHandlerPlayer()~=c:GetControler() or e:GetHandler():GetEquipTarget()==c
end
function s.target(e,tp,eg,ep,ev,re,r,rp,tc,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_CONTROL,tc,1,0,0)
end
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(1-tp)
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(800)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,tp,800)
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Damage(p,d,REASON_EFFECT)
end
function s.desfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_ARCHFIEND)
end
function s.descon(e)
	return not Duel.IsExistingMatchingCard(s.desfilter,e:GetHandlerPlayer(),LOCATION_ONFIELD,0,1,nil)
end
function s.ctval(e,c)
	return e:GetHandlerPlayer()
end