Were you looking for the Athenaeum, the library in Dire Maul?

The Athenaeum is the innermost area of the Scarlet Monastery's library wing, and is what gives the wing its name. It lies beyond the Gallery of Treasures, and is full of members of the Scarlet Crusade. The shelves are filled with books of varied content, and the dungeon's most powerful mage, Arcanist Doan, awaits foolhardy adventurers in the last chamber.

v • d • e Subzones of Scarlet Monastery Athenaeum · Chamber of Atonement · Chapel Gardens · Crusader's Armory · Crusader's Chapel · Footman's Armory · Forlorn Cloister · Gallery of Treasures · The Grand Vestibule · Hall of Champions · Honor's Tomb · Huntsman's Cloister · Training Grounds