At first glance,this modest looking cloak made of black leather,seems to be the perfect blessing for anyone literally wanting to become someone else.
The price it exacts fom the wearer however,is a fate worse than death..
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.