The Killing Curse? Mo gave the other Ravenclaw boy a wide-eyed look before returning to his own notes. Nope. No Unforgivables allowed. People went to prison for stuff like that. He picked up his quill and looked at the list for a spell that hadn't already been mentioned.

"Oh!" His hand shot up. "What about Anteoculatia? It makes antlers grow, which could make the opponent person's head get all heavy and make it hard to move out of the way of oncoming spells. Or they could get tangled in stuff."