The Barrowbrook Frontier
It does nothing but look creepy
This is a human skull with two very detailed glass eyes within the sockets. The eyes are removable, and function as described whether or not they are in the skull.
The first time a living creature passes within the skull’s field of view, the eyes fixate on that creature. They will continue to follow and stay focused on that creature until that creature moves more than 100 feet from the skull, or the skull’s vision is blocked by a physical barrier. Magical concealment or obstruction does not defeat the skull’s vision, nor does stealth. Even incorporeal creatures, if they are alive, trigger the skull’s effect.
The skull does not serve any other purpose.