Wishmaster 3

When Diana, a beautiful coed, discovers an ancient gem inside a mystical Persian case, she unwittingly releases the mercilessly evil "Djinn." The gut-slinging demon uses fiendish trickery to take the form of a professor in order to slice, dice and burn his way through the university staff and its students. If he can overpower Diana, his "waker," and grant her three sick and twisted wishes, the very gates of Hell will open up and engulf the world in eternal damnation. With help from the man she loves, she must impale the bloodthirsty demon with a sword from Heaven to save herself and the entire world.