The party quietly goes up the stairs. There, the spiral stairs end at a short corridor. The group extinguishes their lights since they see light ahead.
The corridor leads to an archway which in turn has an extremely massive room on the far side. The room is easily 100 feet by 200 feet and an unknown height beyond the radius of the light. The group cannot discern the purpose of the room, but it is lit somewhat.
The side of the room where they have entered is dark, but there are two large ravine like structures to the left and right. These structures have wide ramps leading 10 feet down to them, but the ramps appear to have some form of dark liquid oozing on them. There are eight lit braziers which shed light in a 10 foot radius each (i.e. close burst 2 areas marked on map with yellow rectangles). Anywhere outside these areas are dark, but those with low light vision can see 20 feet from them (close burst 4 areas for those with low light vision). The braziers are giving off some smoke, but it isn't enough to hamper vision.
There are four 10 foot tall statues in the corners, but only Acre, Malehan, and Knoepf can see them. They appear to be some type of primordial (at A2), a demon (at A41), a dragon (at U41), and a devil (at U2). But, with the darkness and distance to them, the party cannot make out any specific distinquishing features.
There is also a raised dais, about 5 feet off the ground at the far end. But, the group cannot see the entire dais.
The room appears to be empty, but that could be deceiving. There are plenty of places for someone to be hiding. It's possible that if someone is here in the dark, they might not yet aware of the party. But if the group starts conversing normally, or moving without stealth, or moving too close to a brazier, it's likely that anyone hidden here will notice them.
