This large chamber has two levels. At the bottom, a huge metal device like an iron tower topped with a brass sphere rises at least 30 feet high. Around this strange sphere, an iron catwalk made of a crosshatched grating follows the wall, forming the upper level about 25 feet above the lower. An iron spiral staircase in the southwest corner of the room joins the two levels.
The central tower is a cylinder with a 10 foot diameter. A number of jointed metallic extensions, like the legs of an insect, extend from the tower and connect to the ground or simply jut out into the air at all angles. The top sphere looks about 15 feet across: half the structure's total height. A series of curved plates comprising its brass skin fit together carefully, each bearing a single arcane rune etched into its surface. A few bear images of brass dragons. Here and there on the sphere, a curved plate is missing, exposing an inner gridlike support network of metal bars. The missing plates give the impression that the metallic thing - whatever it is - is either damaged or unfinished.
The floor level has only one apparent exit, the 30 foot wide passage to the east. The upper level has five exits, two 10 foot wide archways leading to the north, two to the south, and one massive metal door to the west.
This illustration doesn't show the exposed interiors and the missing parts.