Demonic taint

In the Aeon of the Champion story series, demonic taint refers to corruption, or the effects of such, of an individual by demons/demonic powers. The taint itself is formless, but in reality, takes on many different forms which usually manifest in the form of sinful behaviours. The Princes of Hell are each masters of a particular kind of sin, and are responsible for the demonic taint arising from living in that particular type of sin. Redemption, usually via prayer, is one of the most effective form of cural - hence why the demon princes set up shrines and covens dedicated to the worshipping of evil, in order to keep people's hearts from being touched by the Light.