Map:Toxic Sewer Map (Atlas of Worlds)
Map Overview
These features may not be universal but have been observed at least once.
An art set presumably from act 3, and a surprisingly nice one given the location. Smooth stonework passageways over water with brass piping and luminescent plants scattered about. A reasonably standard if slightly cramped indoor area layout with many medium sized open spaces separated by narrow connections. The map is continuous and not separated into sub-areas by stairs. The boss is Fairgraves based and the boss area is not especially notable.