Deserted Classrooms

There is a hidden staircase at the end of the sixth floor corridor. If you tap the suit of armor on the arm three times, it will reveal a staircase that resembles the ones like down the dungeons. Follow it down and find a another corridor all with classrooms which were forgotten a long time ago. This is a good place to come if you need somewhere to pratice a spell and no where is free. Or if you just want to be alone.