After you learned the incendio spell, and you have got your nimbus
2000, go up in the sky, and the turn down. you will see a big open
space in the middle of the castle. fly down to is then land on it. it
should have all candles on it. light all of the candles with your
incendio spell, and a treasure chest will appear with a famous witch
or wizards card inside. you can do his numerous times on the roof of
the castle! I have found 3 sets of chests on the roof in different
spots. this code really works!!!!!!!