Tier Breche was a cavern housing the Academy of Menzoberranzan, which consisted of Arach-Tinilith (the clerical school), Sorcere (the wizarding school), and Melee-Magthere (the fighters' school). Tier Breche was technically the name of the cavern where the Academy was located, but in common usage "Tier Breche" often referred to the Academy itself.