Here's what you've learned about this big, big, dark room.
It has a ceiling you can't see.
It has a balcony around the edge of the room about 12 feet up. The balcony has a railing of narrow stone pillars.
There are stairs up to the balcony. You're standing at the foot of the stairs.
It's laid out with a pointy end, where you entered behind the stairs, and then it gets wider.
About two bowshots away from the pointy end there is a platform that is about shoulder high, and Rezin thinks there are people sitting verry still in the dark up on that platform. Also at that end of the room on the balcony, is a cockatrice, which might be dead. Or really angry. Or frightened.