Ravenloft is my pet peeve when it comes to settings. I don't like it, it's too dark for my tastes, but occasionally I had to survive through it, although for a brief time.

Something I never got clear is the set of rules for magic in Ravenloft. My DM introduced harsh situations and troubles associated to enchantments on Ravenloft, but I am not sure if they were in-house development or actual rules. Could you please explain ?