sistema de raridade

achei esse sistema em outro site e queria saber como add atributos como elementfire,absorv essas coisas

<?xml version="1.0" encoding="UTF-8"?>
<mod name="Random Item Stats" enabled="yes">
<config name="itemstats_conf"><![CDATA[
-- //
	extra_loot_key = 123 --: optional storage for higher loot rate
	vocation_base_attackspeed = getVocationInfo(1).attackSpeed --: used for attackSpeed stat
-- //
 
tiers, attr = {}, {}
 
tiers['rare'] = {
	color = 66, -- color of 'RARE' text
	extra = {0, 0},
	attrNames = false, -- show attribute names instead of rare
	chance = {
		[1] = 5000,
		[2] = 5000 chance for 2nd stat
	}
}
tiers['epic'] = {
	color = 35,
	extra = {1, 2}, -- additional percent bonus
	chance = {
		[1] = 2000,
		[2] = 25000
	}
}
tiers['legendary'] = {
	color = 149,
	extra = {2, 4},
	chance = {
		[1] = 500,
		[2] = 100000 -- 2 bonuses always
	}
}
 
MELEE = 0
DISTANCE = 1
ARMOR = 2
SHIELD = 3
WAND = 4
DURATION_RING = 5
CHARGES = 6
 
--! attributes
attr['quick'] = {
	attr = 'attackSpeed',
	name = 'Attack Speed',
	percent = {4, 8},
	types = {MELEE, DISTANCE, WAND}
}
attr['fortified'] = {
	attr = 'extraDefense',
	base = 'defense',
	name = 'Defense',
	percent = {1, 5},
	types = {MELEE, SHIELD}
}
attr['deadly'] = {
	attr = 'extraAttack',
	base = 'attack',
	name = 'Attack',
	types = {MELEE},
	percent = {1, 5}
}
attr['strong'] = {
	attr = 'armor',
	name = 'Armor',
	percent = {1, 6},
	types = {ARMOR}
}
attr['hawkeye\'s'] = {
	attr = 'hitChance',
	name = 'Hit Chance',
	percent = {5, 20},
	types = {DISTANCE}
}
--[[ // not available without source edit
attr['farsight'] = {
	attr = 'shootRange',
	name = 'Shoot Range',
	percent = {10, 20},
	types = {DISTANCE, WAND}
}
]]
attr['charged'] = {
	attr = 'charges',
	name = 'Charges',
	percent = {30, 45},
	types = {CHARGES}
}
attr['divine'] = {
	attr = 'duration',
	name = 'Duration',
	percent = {35, 50},
	types = {DURATION_RING}
}
--/ attributes
 
rate = getConfigInfo('rateLoot')
 
if( getConfigInfo('monsterLootMessage') ~= 0 )then
	print('[Notice] Set monsterLootMessage = 0 to prevent duplicate loot messages')
end
]]></config>
 
<event type="kill" name="itemstats" event="script"><![CDATA[
domodlib('itemstats_conf')
 
function round(n, s)
	return tonumber(('%.' .. (s or 0) .. 'f'):format(n))
end
 
function getContentDescription(uid, sep)
	local ret, i, containers = '', 0, {}
	while( i < getContainerSize(uid) )do
		local v, s = getContainerItem(uid, i), ''
		local k = getItemInfo(v.itemid)
		k.name = getItemAttribute(v.uid, 'name') or k.name
		if( k.name ~= '' )then
			if( v.type > 1 and k.stackable and k.showCount )then
				s = v.type .. ' ' .. k.plural
			else
				local article = getItemAttribute(v.uid, 'article') or k.article
				s = (article == '' and '' or article .. ' ') .. k.name
			end
			ret = ret .. (i == 0 and not sep and '' or ', ') .. s
			if( isContainer(v.uid) and getContainerSize(v.uid) ~= 0 )then
				table.insert(containers, v.uid)
			end
		else
			ret = ret .. (i == 0 and not sep and '' or ', ') .. 'an item of type ' .. v.itemid .. ', please report it to gamemaster'
		end
		i = i + 1
	end
	for i = 1, #containers do
		ret = ret .. getContentDescription(containers[i], true)
	end
	return ret
end
 
local function send(cid, corpse, monster)
	if( isPlayer(cid) )then
		local ret = corpse and isContainer(corpse) and getContentDescription(corpse)
		doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, 'Loot of ' .. monster .. ': ' .. (ret ~= '' and ret or 'nothing'))
		local party = getPlayerParty(cid)
		if( party )then
			for _, pid in ipairs(getPartyMembers(party)) do
				doPlayerSendChannelMessage(pid, '', 'Loot of ' .. monster .. ': ' .. (ret ~= '' and ret or 'nothing'), TALKTYPE_CHANNEL_W, CHANNEL_PARTY)
			end
		end
	end
end
 
local function createLoot(i, ext)
	local item = type(i.id) == 'table' and i.id[math.random(#i.id)] or i.id
	local random = math.ceil(math.random(100000) / ext)
	local tmpItem, f
 
	if( random < i.chance )then
		if i.subType == -1 then
			f = getItemInfo(item)
		end
		tmpItem = doCreateItemEx(item,
			i.subType ~= -1 and i.subType or
			f.stackable and random % i.count + 1 or
			f.charges ~= 0 and f.charges or
			1
		)
	end
 
	if( not tmpItem )then
		return
	end
 
	if( i.actionId ~= -1 )then
		doItemSetAttribute(tmpItem, 'aid', i.actionId)
	end
 
	if( i.uniqueId ~= -1 )then
		doItemSetAttribute(tmpItem, 'uid', i.uniqueId)
	end
 
	if( i.text ~= '' )then
		doItemSetAttribute(tmpItem, 'text', i.text)
	end
 
	local ret, done
 
	for k, v in pairs(tiers) do
		local cur, used = {}, {}
		for i = 1, #v.chance do
			if( math.random(100000) <= v.chance[i] )then
				if( f )then
					f = getItemInfo(item)
				end
				if( not f.stackable )then
					for m, n in pairs(attr) do
						if( not table.find(used, m) and
						(
							( table.find(n.types, MELEE) and table.find({WEAPON_SWORD, WEAPON_CLUB, WEAPON_AXE}, f.weaponType) ) or
							( table.find(n.types, DISTANCE) and f.weaponType == WEAPON_DIST and f.ammoType ~= 0 ) or
							( table.find(n.types, ARMOR) and f.armor ~= 0 and f.wieldPosition ~= CONST_SLOT_NECKLACE ) or
							( table.find(n.types, SHIELD) and f.defense ~= 0 and f.weaponType == WEAPON_SHIELD ) or
							( table.find(n.types, WAND) and f.weaponType == WEAPON_WAND ) or
							( table.find(n.types, DURATION_RING) and f.wieldPosition == CONST_SLOT_RING and f.transformEquipTo ~= 0 ) or
							( table.find(n.types, CHARGES) and table.find({CONST_SLOT_RING, CONST_SLOT_NECKLACE}, f.wieldPosition) and f.charges ~= 0 )
						) )then
							table.insert(cur, m)
						end
					end
 
					if( #cur ~= 0 )then
						local n = cur[math.random(#cur)]
						table.insert(used, n)
 
						n = attr[n]
						local percent, new, tmp = math.random(n.percent[1] + (v.extra[1] or 0), n.percent[2] + (v.extra[2] or 0))
						-- hacks
						if( n.attr == 'duration' )then
							tmp = getItemInfo(f.transformEquipTo)
							if tmp.transformDeEquipTo ~= item then
								break
							end
							new = round( tmp.decayTime * (1 + percent / 100) * 1000 )
						elseif( n.attr == 'attackSpeed' )then
							new = round( vocation_base_attackspeed / (1 + percent / 100) )
						elseif( n.attr == 'hitChance' ) then
							new = round(
								f.hitChance == -1 and
									percent
								or 
									f.hitChance * (1 + percent / 100)
							)

						else
							new = round(
								n.base and
									f[n['attr']] + f[n['base']] * (percent / 100)
								or
									f[n['attr']] * (1 + percent / 100)
							)
 
							if( new == f[n[n.base and 'base' or 'attr']] )then -- no improvement
								break
							end
						end
 
						doItemSetAttribute(tmpItem, n.attr:lower(), new)
 
						local name = getItemAttribute(tmpItem, 'name')
						if( v.attrNames or not name )then
							local name = (v.attrNames and used[#used] or k) .. ' ' .. (name or f.name)
							doItemSetAttribute(tmpItem, 'name', name)
 
							if( f.article ~= '' )then
								local article = getArticle(name)
								if( article ~= f.article )then
									doItemSetAttribute(tmpItem, 'article', article)
								end
							end
						end
 
						local desc = getItemAttribute(tmpItem, 'description') or f.description
						doItemSetAttribute(tmpItem, 'description', '[' .. n.name .. ': +' .. percent .. '%]' .. (desc == '' and '' or '\n' .. desc))
 
						ret = k
					end
					cur = {}
					if( #v.chance == i )then
						done = true
					end
				end
			else
				done = i ~= 1
				break
			end
		end
		if( done )then
			break
		end
	end
 
	return tmpItem, ret
end
 
local function createChildLoot(parent, i, ext, pos)
	if( not i or #i == 0 )then
		return true
	end
 
	local size, cap = 0, getContainerCap(parent)
	for k = 1, #i do
		if( size == cap )then
			break
		end
		local tmp, ret = createLoot(i[k], ext)
		if( tmp )then
			if( isContainer(tmp) )then
				if( createChildLoot(tmp, i[k].child, ext, pos) )then
					doAddContainerItemEx(parent, tmp)
					size = size + 1
				else
					doRemoveItem(tmp)
				end
			else
				if( ret )then
					doSendMagicEffect(pos, CONST_ME_MAGIC_GREEN)
					doSendAnimatedText(pos, ret:upper(), tiers[ret].color)
				end
				doAddContainerItemEx(parent, tmp)
				size = size + 1
			end
		end
	end
 
	return size > 0
end
 
local function dropLoot(pos, v, ext, master, cid, target)
	local corpse
	if( not master or master == target )then -- 0.3/4
		corpse = getTileItemById(pos, v.lookCorpse).uid
		if( isContainer(corpse) )then
			for i = 1, getContainerSize(corpse) do
				doRemoveItem(getContainerItem(corpse, 0).uid)
			end
			local size, cap = 0, getContainerCap(corpse)
			for i = 1, #v.loot do
				if( size == cap )then
					break
				end
				local tmp, ret = createLoot(v.loot[i], ext)
				if( tmp )then
					if( isContainer(tmp) )then
						if( createChildLoot(tmp, v.loot[i].child, ext, pos) )then
							doAddContainerItemEx(corpse, tmp)
							size = size + 1
						else
							doRemoveItem(tmp)
						end
					else
						if( ret )then
							doSendMagicEffect(pos, CONST_ME_MAGIC_GREEN)
							doPlayerSendTextMessage(cid, MESSAGE_EVENT_DEFAULT, "Item raro encontrado!")
							--doSendAnimatedText(pos, ret:upper(), tiers[ret].color)						
						end
						doAddContainerItemEx(corpse, tmp)
						size = size + 1
					end
				end
			end
		end
	end
	send(cid, corpse, v.description)
end
 
function onKill(cid, target, damage, flags)
	if( (damage == true or bit.band(flags, 1) == 1) and isMonster(target) )then -- 0.3/4
		local creature = getCreatureName(target)
		if(creature ~= nil and creature ~= '') then

			local v = getMonsterInfo(creature)		
			if( v and v.lookCorpse ~= 0 )then
				local s = getCreatureStorage(cid, extra_loot_key)
				addEvent(dropLoot, 0, getThingPos(target), v, s == -1 and rate or s, getCreatureMaster(target), cid, target)
			end
		
		end
	end
	return true
end
]]></event>
 
<event type="login" name="itemstats_login" event="buffer"><![CDATA[
	registerCreatureEvent(cid, 'itemstats')
]]></event>
 
</mod>