The Exarch Stones
Due to their strong link to magic, mages are highly susceptible to possession by demons. In order to reduce the risk of possession, mages are brought into the mages guild at a young age and trained under experienced tutors on the various subjects of magic. However, possession is still a possibility in even the most experienced of mages, and it does happen. That’s when the Templars step in. Templars have taken even more extreme measures to guard themselves from possession, even taking special elixirs that reduce fortify the mind. Templars can be possessed however, and when one is, the resulting creature is frightening to behold. The creature is called an immortal, called that because of how difficult it is to kill.