[@Grec]I've got the core books for all the Old World of Darkness table top games except for mummy, I was asking because Demons aren't capable of reality manipulation that I am aware of, out side of one Lore but [@DepressedSoviet] seems like he has written up a Slayer so that wouldn't really be an issue. 

The ones that play havoc with reality are Mages as that is literally their ability, they manipulate reality through force of will. I bring this up because I was writing up a Mage and wanted to make sure that was still okay, or if I was going to need to reeducated myself on what you would allow a Mage to do.