A burnt human skull, long forgotten, gathering dust. It looks up and smiles or maybe not. If the skull is.. fed, it will grow and animate into a skeleton for ten minutes and will follow your commands acting as a hireling with Protector 3, Warrior 2, and Burglar 1. If there is easily available blood, it will feast and remain a skeleton for another ten minutes. If you deny it blood directly, it will rebel and try to kill you.
If you have the skull when you die, you may offer it to Death and receive a +1 forward to your last breath roll.
If you directly ask the skull a question the skull will grin and answer in your mind. It will answer to the best of its knowledge but might leave some important information out depending on the questioner’s alignment and reasoning. It will be more willing to answer and divulge more information to someone of evil alignment. Bribing with blood is a valid option as well.
The skull is very good at listening. It will try to learn all your secrets.