Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card can only be Ritual Summoned with the Ritual Spell Card, "Ritual of Destruction". When this card is Ritual Summoned, destroy all other face-up monsters on the field with DEF less than or equal to this card's ATK. This card gains 100 ATK for each monster destroyed by this effect.
--破滅の魔王ガーランドルフ
--Garlandolf, King of Destruction
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--destroy
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
s.listed_names={52913738}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsRitualSummoned()
end
function s.filter(c,atk)
	return c:IsFaceup() and c:IsDefenseBelow(atk)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local c=e:GetHandler()
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,c,c:GetAttack())
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsFacedown() or not c:IsRelateToEffect(e) then return end
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,c,c:GetAttack())
	local ct=Duel.Destroy(g,REASON_EFFECT)
	if ct>0 then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(ct*100)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD_DISABLE)
		c:RegisterEffect(e1)
	end
end