black magic
black arts

Black magic would be waiting for them on the ground.

It doesn't matter whether black magic is real or not.

However, at the same time that type of knowledge is also considered to be black magic.

They were also experts in the art of black magic.

The use of black magic could not really damage her case now.

Later, a group of students go out into the forest at night to play around with black magic.

"Was he using black magic and such to grow hair for people?"

That was just a figure of speech; you know I don't hold with black magic.

I've been suspected of black magic often enough as it is.

That appealed to me a lot more than trying to work out some black magic.