Shulker bullets are projectiles fired by Shulkers, a type of hostile mob found in the game Minecraft. When a player is within range, Shulkers will shoot these bullets, which travel in a straight line and can cause damage upon impact. These bullets have a unique property: they can inflict the Levitation effect on players and entities hit by them. This effect causes the affected player to float upwards for a short duration, making it challenging to navigate and avoid further attacks from Shulkers.