SCREENSHOT

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SCRIPT
Crie um arquivo chamado ballista.lua na pasta data/actions

local config = {
    shootRange = 7,
    damage = {50, 100}, -- min/max
    shootEffect = CONST_ANI_HUNTINGSPEAR,
    impactEffect = CONST_ME_HITAREA,
    exhaustOnUse = 300, -- miliseconds
    direction = {
        [5692] = DIRECTION_NORTH,
        [5701] = DIRECTION_EAST,
        [5698] = DIRECTION_WEST,
        [5695] = DIRECTION_SOUTH
    }
}

local exhaust = Condition(CONDITION_EXHAUST_WEAPON)
exhaust:setParameter(CONDITION_PARAM_TICKS, config.exhaustOnUse)

function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    if player:getCondition(CONDITION_EXHAUST_WEAPON) then
        player:sendTextMessage(MESSAGE_STATUS_SMALL, Game.getReturnMessage(RETURNVALUE_YOUAREEXHAUSTED))
        return true
    end

    player:addCondition(exhaust)
    for i = 1, config.shootRange do
        local nextPosition = item:getPosition()
            nextPosition:getNextPosition(config.direction[item.itemid], i)

        local tile = Tile(nextPosition)
        if tile then
            local topCreature = tile:getTopCreature()
            if topCreature then
                toPosition:sendDistanceEffect(topCreature:getPosition(), config.shootEffect)
                doTargetCombatHealth(player, topCreature, COMBAT_PHYSICALDAMAGE, -config.damage[1] * i, -config.damage[2] * i, config.impactEffect)
                return true
            end
        end
    end

    local nextPosition = item:getPosition()
    nextPosition:getNextPosition(config.direction[item.itemid], config.shootRange)

    toPosition:sendDistanceEffect(nextPosition, config.shootEffect)
    return true
end

Não esqueça de adicionar a tag em actions.xml

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CRÉDITOS
Printer

Coloquei a tag e tals, mas da esse erro na distro

Spoiler

[09/11/2015 13:03:02] [Error - Action Interface]
[09/11/2015 13:03:02] data/actions/scripts/ballista.lua
[09/11/2015 13:03:02] Description:
[09/11/2015 13:03:02] data/actions/scripts/ballista.lua:15: attempt to call global 'Condition' (a nil value)
[09/11/2015 13:03:02] [Warning - Event::loadScript] Cannot load script (data/actions/scripts/ballista.lua)

 

 

Poderia ajudar?

 

a tag que coloquei foi essa:

Spoiler

        <action itemid="11586" event="script" value="ballista.lua"/>