Wolfan Transformation is one of the Special Ablities certain Evil students can learn at the School for Good and Evil.
Only certain students from a fairytale city called Bloodbrook can learn the Wolfman Transformation Ability. It's kind of like being a werewolf but you get to chose when you morph and you have more control over your powers. One of the things Wolfmen can do ( besides being strong, obviously ) is wake up men who are in the grasp of a magical sleep spell, Just like a true loves kiss wakes a woman.
Hort, a Never, is one of the special students who has the ability to transform. Throughout the books, he transforms to help himself and others get through certain challenges, although he cannot last as one for more than a couple seconds.