In various popular media, like Hellboy and the Tannhauser game, the Nazis are depicted as having been heavily involved in the occult and even tried to research and use it for weapons. Were they really involved with the occult, and if so to what degree and how much was for weapons development?
You should check out the section of the FAQ dedicated to Nazis and the Occult. Whatever interest some of the Nazi elite might have had in mysticism, popular culture has basically turned it up to 11. I talk a little bit about that here.