I came up with this idea of creating this world, where the worst of the worst of a fantastic non-magical world are sent to this prison "realm" which keeps expanding chamber by chamber.
The story starts with the first-comers finding a dark room opening into a new area, and there is no certainty about when the next one will open.
In the current generation, they still don't know more than
some rooms hold useful supplies
some others hold grave dangers (Dragons, chimeras and big groups of enemies that a little party can't deal with and require a substantial amount of people to defeat it. I haven't thought exactly what, but the idea is to have really challenging creatures that in some cases have assured deaths like people having to act as cannon fodder and getting basically shredded to pieces, characters don't know what will it be but they are sure the hardship is assured) in them that may or may not give anything back in return for the dangers and their size is not determined.
I have dealt with the corpses by creating squads of criminals that take the corpses to distant chamber from the base camp.
The races I wanted to introduce into this world are orcs that live in isolated patriarchal societies where the strongest of them all leads as patriarch of the group and decides what will the group do, this patriarch is forced to accept any duel as demonstration of power and leadership, they are extremely smart and avoid external conflict and exiled orcs as they lose the order of the group start preying on any weaker being around that has anything valuable on them.
Goblins have the most human-like society as they live in big underground cities that no other race can enter but they constantly interact with other races through outposts set up in the surface where they trade goods and information that attracts people of all sides of the world and they are not eager to deal with any danger to their lifestyle.
Last but not least Slithereen are an underwater civilization that has not been seen in thousands of years and just recently woke from a long slumber the king of the depths imposed on them to save them from the poisonous environment that their world was turning into. Their species are really fast learners and within a month of interacting with other races they are able to perfectly speak their language, but their devotion and love for their savior the king of the depths is something they will never leave behind.
As there is more than one race living in there, is segregation something that is inevitable or will the dangers of the prison keep everyone together?