Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 Level 8 Insect monster + 1 Level 7 Insect monster You can only Special Summon "Ultimate Great Insect" once per turn. Must first be either Fusion Summoned, or Special Summoned from your Extra Deck by Tributing 1 Insect monster with 2000 or more DEF equipped with an Equip Card. Cannot be destroyed by battle. Once per turn, during the Battle Phase, if a face-up card is in a Field Zone (Quick Effect): You can destroy all monsters your opponent controls.
--完全態・グレート・インセクト
--Ultimate Great Insect
--Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	c:SetSPSummonOnce(id)
	--Fusion materials: 1 Level 8 Insect monster + 1 Level 7 Insect monster
	Fusion.AddProcMix(c,true,true,s.matfilter(8),s.matfilter(7))
	--Special Summon limitation
	local e0=Effect.CreateEffect(c)
	e0:SetType(EFFECT_TYPE_SINGLE)
	e0:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e0:SetCode(EFFECT_SPSUMMON_CONDITION)
	e0:SetValue(s.splimit)
	c:RegisterEffect(e0)
	--Alternate summon procedure
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetRange(LOCATION_EXTRA)
	e1:SetCondition(s.hspcon)
	e1:SetTarget(s.hsptg)
	e1:SetOperation(s.hspop)
	c:RegisterEffect(e1)
	--Cannot be destroyed by battle
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetValue(1)
	c:RegisterEffect(e2)
	--Destroy all opponent monsters
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,0))
	e3:SetCategory(CATEGORY_DESTROY)
	e3:SetType(EFFECT_TYPE_QUICK_O)
	e3:SetCode(EVENT_FREE_CHAIN)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1)
	e3:SetHintTiming(0,TIMING_BATTLE_START|TIMING_BATTLE_END)
	e3:SetCondition(s.descon)
	e3:SetTarget(s.destg)
	e3:SetOperation(s.desop)
	c:RegisterEffect(e3)
end
function s.matfilter(lvl)
	return function(c,fc,sumtype,tp)
		return c:IsLevel(lvl) and c:IsRace(RACE_INSECT,fc,sumtype,tp)
	end
end
function s.splimit(e,se,sp,st)
	return aux.fuslimit(e,se,sp,st) or not e:GetHandler():IsLocation(LOCATION_EXTRA)
end
function s.hspfilter(c,tp,sc)
	return c:IsRace(RACE_INSECT) and c:IsDefenseAbove(2000) and c:GetEquipCount()>0
		and Duel.GetLocationCountFromEx(tp,tp,c,sc)>0
end
function s.hspcon(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	return Duel.CheckReleaseGroup(tp,s.hspfilter,1,false,1,true,c,tp,nil,false,nil,tp,c)
end
function s.hsptg(e,tp,eg,ep,ev,re,r,rp,chk,c)
	local g=Duel.SelectReleaseGroup(tp,s.hspfilter,1,1,false,true,true,c,tp,nil,false,nil,tp,c)
	if g and #g>0 then
		g:KeepAlive()
		e:SetLabelObject(g)
		return true
	end
	return false
end
function s.hspop(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.Release(g,REASON_COST|REASON_MATERIAL)
	g:DeleteGroup()
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsBattlePhase() and Duel.IsExistingMatchingCard(Card.IsFaceup,0,LOCATION_FZONE,LOCATION_FZONE,1,nil)
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	local g=Duel.GetFieldGroup(tp,0,LOCATION_MZONE)
	if chk==0 then return #g>0 end
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetFieldGroup(tp,0,LOCATION_MZONE)
	if #g>0 then
		Duel.Destroy(g,REASON_EFFECT)
	end
end