Avada Kedavra, Imperius, and Cruciatus — are known as the Unforgivable Curses. The use of any one of them on any sentient life is enough to earn a life sentence in Azkaban.
Phineas Black had enough of you and instaured a curfew inside the castle. Now prefects will try to catch you between the curfew hour. Adds 8 new custom prefects to the game.