Quirrell is the final Boss in Year 1 in LEGO Harry Potter Years 1-4 and a playable character in the game. Once you reach the final area, the Boss begins. Voldemort/Quirrell will have three hearts, when you start you'll instantly see fire everywhere, so you're trapped. First Voldemort/Quirrell will destroy some parts of the floor and fire will come up. He begins shooting fireballs from his wand, so dodge them quickly and wait until he casts a green skull-like spell (a variation of the Verdimillous Charm) at you. Now you need to use the Levitation Charm to cast it back at him to knock him out. When he is knocked out you need to jump over the holes in the floor and have Harry touch him to burn him. Once he loses health he will force you back and destroy even more parts of the ground. Keep dodging until you get another heart down.