I walked through the building, infinite sprawling concrete in every direction, a utilitarian complex full of pointlessly complex structures and meaninglessly large rooms. Monsters crawled through the concrete jungle, but it was nothing I had not seen before. I wore armor made from their flesh and wore a sword. I had been tasked to hunt down a raptor-esque monster somewhere in the ventilation system.
I entered the main vent room: it was hauntingly large, with lights and fans which I could toggle on and off. Despite the large size of the structure, it was almost claustrophobic.