The Grand Vestibule is the outermost chamber of the Scarlet Monastery. It holds the entrances to all of the dungeon's wings, and leads via short passages to the Chamber of Atonement in the graveyard wing, the Huntsman's Cloister in the library wing, the Training Grounds in the armory wing, and the Chapel Gardens in the cathedral wing. The latter two wings are barred by locked doors, and require the Scarlet Key to open.
The vestibule itself is decorated with pillars and statues of scarlet warriors. It is often a contested place, as Horde and Alliance-affiliated adventurers mingle in the hall with sometimes brutal results.