During the fight, they will not attack, but they will heal the queen. Each drone has 1000 life points, and they can only be killed by Void Knight archers, which is why it is important that the player keeps the archers alive. The first time the drones spawn during the fight they will be in a group of four. A group of three drones will spawn shortly after the first group has been killed. After that two will spawn, and finally a single one; after that, no more drones will appear.