From WoWWiki

The Chamber of Summoning is located inside Scholomance, just past the Reliquary. It leads on to a lower level with the large unnamed main chamber branching off into three directions below. The Chamber of Summoning is full of necromancers who contiously summon skeletons to serve their bidding. Access to the Scholomance balcony, where one can battle the evil gargoyle Kirtonos the Herald, is also found in this chamber.

Subzones of Scholomance
Barov Family Vault • Chamber of Summoning • The Coven • The Great Ossuary • Hall of Secrets • Hall of the Damned • Headmaster's Study • The Laboratory • The Reliquary • The Shadow Vault • The Viewing Room • Vault of the Ravenian