pet pets slave slaves droid droids
You can buy pets (slaves, droids) in certain shops. Once you have bought them they will follow you and your orders like charmed mobs. Mobs being attacked by your pets will know that they are your pets and thus attack you as well if they get the chance. Some pets will automatically help you, some will cast spells for you, noone will steal money from you, but some will steal money for you. You cannot sell a pet to regain the money spent for it when you leave, but at any shop selling pets, you can store a pet and load it back again later. To do so, use "stash <pet>" in a pet-shop, which will put it into the stables/cages/... use "receive" to get it back afterwards.