Pets would be great for destiny, think about, you are a lone wolf who prefers playing alone without people to steal your kills, but now u have a pet that kills enemys and gives you the kill.or you can have a peaceful pet in the tower. OR, bring ur aggressive killing machine in the tower, speaking about the tower, why not have a apartment system in the tower for your guardians, you can have party's and different sized buildings and make it customizable, and a great place to have your pets rest after taking damage for a battle, thanks for reading and let's pray for the best:)