Autonulls are passive until they are attacked, at which point they move slowly towards the player, removing 18ф Rift Time on contact.
Once an Autonull is low on ❤ Health it will throw up to 3x❈Defensive Blocks, which are surrounded by particles. The Autonull is invincible whilst there are Defensive Blocks, and thus the player break them, by standing in the particles and mining them, at which point the player may attack the mob again.