Nigon is the second underground race.

And another important question – should they have their own type of terrain, or will they share it with Dungeon? Because all factions have their own...

Added after 12 minutes
By the way, there is already one race in Dungeon that is a rival to the Dark Elves. These are the Dwarves. According to the history of Ashan, they appeared there even earlier than the Dark Elves. This is why they had a war. And the Dwarves have their own landscape in Dungeon. However, there are no multiplayer maps with the Dwarven underground landscape because they also have a surface landscape – snow.