I'm going to go out on a limb and assume you don't mean black magic as in sacrifices, high rituals and the many forms of devil worship. If you do, we're going to have to have an unpleasant talk. Now, if you mean it as in... say, attack magic as opposed to healing, then I don't have any problems with that.

...I have a friend you'd get along well with. He's good with a whip, too.