Demon
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Demons are difficult to classify in purely physical terms, even more so than other outsiders.
A demon is corruption incarnate, or even discarnate in some cases. Exactly what or how they corrupt depends on the type of demon. Some erode self-control, some fosters isolation and depression, some spread mistrust and paranoia, and others yet make people hate with greater fervor.
Their influence corrupts anything given enough time. The common conception of the horned beast with sharp teeth and claws bears some validity, but in many cases they play out their role more through manipulation an influence than brute violence.