Most of the time, Golrie will be in the cell in the north-west. To talk to him, you will need the key to his cell, which is in the crate in the north-east chamber. Once you've freed him, in one quest you will find him outside the cell with the hobgoblins that were guarding him locked up. Later, the hobgoblins will again be outside with Golrie locked in the cell.
The main chamber has large and small monoliths, which the player must occasionally push aside to reach portions of the chamber. There are several chests here which hold items used in The Path of Glouphrie quest. The mahogany chest near the centre of the chamber contains the strongroom key which unlocks Yewnock's strongroom to the west. The mahogany chest itself is locked and must be opened with a key found in one of the other chests.