local UPGRADE_ITEM_ID = 5902 -- The upgrade item, in this case, the "scary blue eye"
local LIFE_LEECH_INCREMENT = 1 -- Percentage to be added to Life Leech
local MANA_LEECH_INCREMENT = 1 -- Percentage to be added to Mana Leech
local MAX_LEECH_PERCENT = 100 -- Maximum limit for Life Leech and Mana Leech
local FIXED_DAMAGE = 100000000000 -- Fixed damage to be dealt

function onUse(cid, item, fromPosition, itemEx, toPosition)
    -- Check if the player is valid
    if not isPlayer(cid) then
        return false
    end

    -- Get the weapon the player is holding (left or right hand)
    local weapon = getPlayerSlotItem(cid, CONST_SLOT_LEFT)
    if weapon.itemid == 0 then
        weapon = getPlayerSlotItem(cid, CONST_SLOT_RIGHT)
    end

    -- Check if the player is holding a weapon
    if weapon.itemid == 0 then
        doPlayerSendTextMessage(cid, MESSAGE_STATUS_SMALL, "You need to be holding a weapon to upgrade it.")
        return false
    end

    -- Get the current Life Leech and Mana Leech values (if they exist)
    local currentLifeLeech = tonumber(getItemAttribute(weapon.uid, "lifeLeech")) or 0
    local currentManaLeech = tonumber(getItemAttribute(weapon.uid, "manaLeech")) or 0

    -- Accumulate new leech values, limited by the maximum
    local newLifeLeech = math.min(currentLifeLeech + LIFE_LEECH_INCREMENT, MAX_LEECH_PERCENT)
    local newManaLeech = math.min(currentManaLeech + MANA_LEECH_INCREMENT, MAX_LEECH_PERCENT)

    -- Apply the new Life Leech and Mana Leech values to the weapon
    doItemSetAttribute(weapon.uid, "lifeLeech", newLifeLeech)
    doItemSetAttribute(weapon.uid, "manaLeech", newManaLeech)

    -- Modify the weapon's description to show the new leech values
    local description = getItemAttribute(weapon.uid, "description") or ""
    description = "This weapon now has " .. newLifeLeech .. "% Life Leech and " .. newManaLeech .. "% Mana Leech. The maximum is 100%."
    doItemSetAttribute(weapon.uid, "description", description)

    -- Send a message to the player informing about the upgrade
    doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "Your weapon has been upgraded! It now has " .. newLifeLeech .. "% Life Leech and " .. newManaLeech .. "% Mana Leech. The maximum is 100%.")

    -- Display animated text "+Leech!!!" in green (color 35)
    local position = getCreaturePosition(cid)
    doSendAnimatedText(position, "+Leech!!!", 35)

    -- The line that removed the upgrade item has been removed to allow infinite use
    -- doRemoveItem(item.uid, 1) -- REMOVED

    -- Combat logic: damage with the weapon
    local target = getCreatureTarget(cid)
    if isCreature(target) then
        -- Check if the weapon has reached the limit for Life Leech and Mana Leech
        if newLifeLeech == MAX_LEECH_PERCENT and newManaLeech == MAX_LEECH_PERCENT then
            -- Fixed damage from the weapon
            local damage = FIXED_DAMAGE 

            -- Apply the damage to the target
            doTargetCombatHealth(cid, target, COMBAT_UNDEFINEDDAMAGE, -damage, -damage, CONST_ME_EXPLOSIONHIT)
            doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "You dealt " .. damage .. " damage with your weapon!")
        else
            doPlayerSendTextMessage(cid, MESSAGE_STATUS_SMALL, "Your weapon has not reached the limit to deal damage.")
        end
    else
        doPlayerSendTextMessage(cid, MESSAGE_STATUS_SMALL, "You do not have a valid target to attack.")
    end

    return true
end

local UPGRADE_ITEM_ID = 5902 -- Item para ativar leech
local LIFE_LEECH_INCREMENT = 1 -- Incremento de Life Leech
local MANA_LEECH_INCREMENT = 1 -- Incremento de Mana Leech
local MAX_LEECH_PERCENT = 100 -- Máximo de leech permitido

function onUse(cid, item, fromPosition, itemEx, toPosition)
    if not isPlayer(cid) then
        return false
    end

    local weapon = getPlayerSlotItem(cid, CONST_SLOT_LEFT)
    if weapon.itemid == 0 then
        weapon = getPlayerSlotItem(cid, CONST_SLOT_RIGHT)
    end

    if weapon.itemid == 0 then
        doPlayerSendTextMessage(cid, MESSAGE_STATUS_SMALL, "You need to be holding a weapon to upgrade it.")
        return false
    end

    local currentLifeLeech = tonumber(getItemAttribute(weapon.uid, "lifeLeech")) or 0
    local currentManaLeech = tonumber(getItemAttribute(weapon.uid, "manaLeech")) or 0
    local newLifeLeech = math.min(currentLifeLeech + LIFE_LEECH_INCREMENT, MAX_LEECH_PERCENT)
    local newManaLeech = math.min(currentManaLeech + MANA_LEECH_INCREMENT, MAX_LEECH_PERCENT)

    doItemSetAttribute(weapon.uid, "lifeLeech", newLifeLeech)
    doItemSetAttribute(weapon.uid, "manaLeech", newManaLeech)

    local description = "This weapon now has " .. newLifeLeech .. "% Life Leech and " .. newManaLeech .. "% Mana Leech. The maximum is 100%."
    doItemSetAttribute(weapon.uid, "description", description)

    doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "Your weapon has been upgraded with " .. newLifeLeech .. "% Life Leech and " .. newManaLeech .. "% Mana Leech.")
    local position = getCreaturePosition(cid)
    doSendAnimatedText(position, "+Leech!!!", 35)

    return true
end

Agora, configure o dano e o leech para funcionar sempre que a arma equipada atingir uma criatura. Este script pode ser adicionado ao creature scripts do servidor, ativando o leech no evento onAttack.

1. Adicione este código no arquivo de creature scripts:

   function onAttack(cid, target)
       if not isPlayer(cid) or not isCreature(target) then
           return true
       end
   
       local weapon = getPlayerSlotItem(cid, CONST_SLOT_LEFT)
       if weapon.itemid == 0 then
           weapon = getPlayerSlotItem(cid, CONST_SLOT_RIGHT)
       end
   
       local lifeLeech = tonumber(getItemAttribute(weapon.uid, "lifeLeech")) or 0
       local manaLeech = tonumber(getItemAttribute(weapon.uid, "manaLeech")) or 0
   
       if lifeLeech > 0 or manaLeech > 0 then
           local damage = math.random(50, 150) -- Dano variável para cada ataque (ajuste conforme necessário)
           
           doTargetCombatHealth(cid, target, COMBAT_PHYSICALDAMAGE, -damage, -damage, CONST_ME_EXPLOSIONHIT)
   
           -- Calcula o leech
           local lifeSteal = math.floor((damage * lifeLeech) / 100)
           local manaSteal = math.floor((damage * manaLeech) / 100)
   
           doCreatureAddHealth(cid, lifeSteal)
           doPlayerAddMana(cid, manaSteal)
   
           -- Mensagem opcional para mostrar o leech
           doPlayerSendTextMessage(cid, MESSAGE_STATUS_CONSOLE_ORANGE, "Life Leech: " .. lifeSteal .. " | Mana Leech: " .. manaSteal)
       end
   
       return true
   end

   
   2.Atualize o arquivo creaturescripts.xml para adicionar o novo script:
    

   <event type="attack" name="WeaponLeech" script="leechAttack.lua"/>

   
   3.No arquivo login.lua, adicione uma linha para registrar o evento onAttack:
    

registerCreatureEvent(cid, "WeaponLeech")