AuraPotionEventHook

public class AuraPotionEventHook
{
    @SubscribeEvent
    public void onEntityUpdate(LivingUpdateEvent event)
    {
        if (event.getEntityLiving().isPotionActive(Main.auraPotion))
        {
            if (event.getEntity().worldObj.rand.nextInt(20) == 0)
            {
                event.getEntityLiving().addPotionEffect(new PotionEffect(Potion.getPotionById(1), 30 * 20, 1));
            }
        }
    }
}