Occult

You can host a seance. You're cognizant with basic terminology. You can truly understand the Tarot. You may even have memorized Harris' book. You're a professional psychic. You're also aware that there's more in heaven and earth than is dreamt of in most philosophies. You're a trained parapsychologist. You know which stuff Bram Stoker made up, and which is actually true. You could've written Crowley's books for him. You've specialized in one or two of the parapsychic specialties or races, and can make a living as a debunker - or a hunter, if you're insane.