This is how hells are usually described. The general populace lives in a world of retribution: a gray, hopeless place surrounded by demons. Those even less luck

This is how hells are usually described. The general populace lives in a world of retribution: a gray, hopeless place surrounded by demons. Those even less lucky end up in the inner citadels, that are actual hells where demons harvest fear. The entire mini-world is managed by a small arch-demon. Escape is possible, but needs help from the outside.