A sorcerer with evil intentions or just a murderer waiting for another fool?
At a crossroads, the characters come across a trio of thick poles set into the ground, just outside the overlapping roads.
The PCs find a strange helmet, when donned it will take control of that PC and speak and act trough him/her. It explains that it is benevolent and needs their help in a quest and that it will stop possessing the PC when the task is done. Great if a player is gone for a number of sessions.