-- Store the effect attached to the GameObject
local _Effect = vci.assets.GetEffekseerEmitter("EffectItem")

function onUse()
    -- Assign a random value between 1.0 and 3.0 into the speed
    local speed = 0.1 * math.random(10, 30)

    -- Change the play speed of the effect
    _Effect._ALL_SetSpeed(speed)

    -- Play the effect only once
    _Effect.PlayOneShot()
end