City of Dis

The Iron City of Dis, better known as the  City of Dis or simply Dis, is a large settlement on the second layer of the Nine Hells.

Description
The Iron City of Dis is a massive black metropolis of cluttered structures and labyrinthine alleyways. The city is built of metal ramparts and crumbling towers across miles of hills. The city is also suffused with perpetual hellish heat - vision is distorted in the hot air, the streets emit smoke, the edges of the city give off a heated glow, and ashes and embers are carried through the air.

Most of the buildings are multiple stories tall and built out of dark red, black, and gray stone. At the center, visible everywhere in the city regardless of the direction the viewer is facing, is the Iron Tower - an impossibly tall tower of black iron and lead. The tower rises hundreds of miles into the dark sky, clouds blocking any sight of the top. The Iron Tower is the throne of the archdevil Dispater.

City of Dis is always changing and being rebuilt in accordance with Dispater's paranoid orders.

Demographics
Like the rest of the Nine Hells, Dis has a strict hierarchy. There are different kinds of devils, and each devil has to answer to different devils who have authority over them, up to greater devils and then archdevils, who in turn all answer to Asmodeus. The devils are constantly at war among themselves between the different levels of fealty and authority.

Not all the devils are in the same system. There is a promotion-demotion system in which devils advance and are demoted, but there are other fiends existing in that space that aren't part of that system. Rakshasas, succubi, and incubi are somewhat outside of the system. There are other fiendish creatures that traverse between both the Abyss and the Hells based on what their interests are.

Tieflings are quite often found there, because of the social construct, in this city specifically, that revolves around the cross-section between the mortal races and devils. Similarly, cambions do live in this city, and Vox Machina encountered and made a deal with one of them called Ipkesh.

It is not a rare occurrence for mortals to visit the City of Dis because it is where various resources, especially souls, are traded between various parties within and beyond the Hells. The true value of a soul, however, is in corrupting and claiming it rather than consuming it. Because of the bureaucratic nature of these deals, contracts play a large role in Dis.

The "insects" that dwell in the city are technically extremely small fiends.