With Vampire and Dr. Von's Monster I think it would be fitting to have a Werewolf spell to accompany these famous creatures. It could be a 5 or 6 pip spell that attacks one person for perhaps 480-530 damage and maybe gives +25% to the next spell (either as a blade or as a trap placed on the target) or perhaps could stun the target for one round.
It would not only be cool to see the transformation, but it'd be a nice spell effect to add to any house!
damage and maybe gives +25% to the next