Skyrim:Hall of Rumination

It is part of the Dwemer city in the western part of Blackreach.

 
Walkthrough
Exterior
The entire Dwemer city is patrolled by both Falmer and their servants, who man the walls and wander the grounds. Many of them are near this building and the paths to it; care must be taken to avoid alerting too many at once. A good place from which to snipe them is the raised bridge between the Pumping Station and the Debate Hall. Once these enemies are dealt with, the Hall of Rumination may be entered in the northwestern part of the city. There is only one ground-level entrance.

Hall of Rumination
Upon entering, you emerge in a badly damaged room, with rubble everywhere. In the center is a basin with stone chairs arranged around it, two of which are occupied by Falmer servants. There is also a third servant off to the right on a raised section, and a Falmer to the left down a flight of stairs; both will be alerted to any fighting. Opposite the entrance, at the rear of the room in the northwest corner, is a metal gate blocking access to a flight of stairs. This gate is opened by a lever on the raised section to the north. To the south are stairs leading down to a large area including a room under the basin, but this area contains nothing of interest. 

To the north are the stairs leading up to the raised section, which features two closed doors in the east wall. The door on the left opens into a room containing two Falmer servants sitting in chairs. In the northwest corner of this room is an unlocked wall chest. The room on the right is a bedroom, and contains two more servants as well as several stone beds, a table, and chairs. Whichever room you enter first, any fighting may alert the servants in the other room. In front of the second bedroom is a stone chair and the lever that opens the gate blocking the stairs in the northwest corner of the room.

Climbing the stairs in the northwest corner of the main room past the gate leads up to a corridor with a closed unlocked metal gate about halfway along it. Past the gate is a Falmer wandering around a T-junction, with a corridor leading to a lift ahead, and another corridor around the corner to the southeast. Taking the second corridor, you will find an unlocked chest on your left next to some piping, and a wall chest up ahead to the southwest where the corridor turns again to the southeast. There are two garnets and a Dwemer cog on the small stone platform under the wall chest. Stairs to the southeast lead up to a door that exits outside, where you will find a tall circular rock pillar in front of you, and balconies extending to the left and right. From here, you can look out over most of the city.

Returning inside the hall to the lift and activating it will take you to a short exterior corridor that heads south before it turns to the east and ends at a door. The enemies beyond the door may detect you if you are not careful. The door opens to a far higher narrow balcony, with two Falmer servants and a leveled Falmer. Ahead is a curved ramp leading down to a large circular platform, with what appears to be a throne on a raised section in the center. Staying on the upper balcony and following it clockwise around the lift tower brings you to a crimson nirnroot growing in a large urn. From the circular platform, you can see much of Blackreach far below you. The large orange globe hanging above the Silent City is slightly below you. Using Unrelenting Force on the globe allows you to summon Vulthuryol. You can also use Become Ethereal to safely jump down to the courtyard below.

Maps