Evil

Hugh hunts and is in some ways powered by "evil." "Evil" needs a definition.

Ben proposes that it is limited to supernatural power of evil principalities, traditionally, demons. The proximity and magnitude of these powers or their handiwork triggers Hugh's mark and his supernatural abilities. In earth examples of common enemies would be werewolves, vampires, and the undead all who are the product of demonic intervention. In Twinworld demons take a corporeal form and therefore can be combated directly.