An area primarily accessible through a door located in James's Office, during 3:44 to 3:46 AM, every Tuesday morning. There is also an entrance through the ceiling in the same building, which leads to a different part of the dungeon, and a suspected third entrance somewhere that has yet to be discovered. Unofficially dubbed Officium Mundi (Office World).
The dungeon contains space that, while not verifiable as infinite, is far larger than both the stairwell it is "contained" within, and the office building itself. Characters have walked miles, distances far exceeding even a large building without deviating from a straight line.
The dungeon is home to a number of creatures, many of them hostile to human intrusion. Those creatures are spread across a number of distinct biomes.
The Cubicles, denoted by endless rows of beige office cubes. This is the area surrounding the entrance of the dungeon, and appears to make up the bulk of it. Home to striders and shellaxies in large numbers. Farther away from the entrance, this area also has a pseudo-ceiling, as the walls grow taller and eventually join overhead. Other architectural aberrations also appear as the distance from the door grows.
The Break Room, a place of tile floors, brighter lights, exploding coffee, and tumblefeeds.
The Bathrooms, explored later. The one known instance is somewhere 'west' of the entrance. The exterior is a spire of blue and white tile with a perfectly normal bathroom door that opens under no special conditions. Inside, floating platforms of tile, containing sinks, mirrors, toilets, and other bathroom amenities, float within a tower of suspended gravity. Contains bugs.
The Open Spaces, an area with much lower walls than the rest of the cubicles, and a higher density of traps that were previously unseen. Also home to the Decision Tree.
The Ocean and the Beach. The beach is made up of 'gravel', pen lids and dusted paper, that almost mimics sand. It contains a variant of the decision trees, and borders the sea of printer ink that is the ocean.
Towers. Larger collections of cubicles stacked atop each other, forming patterns a lot like an apartment structure. Since the dungeon has begun resetting, they are the only spaces that are left untouched each week, making them a safe space to store equipment. Towers often contain very dense, exceedingly hostile office life.