Arandor
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What I mean is that the underground world will definitely be in the sixth installment of Heroes, so someone must live there. It definitely won't be mages or elves; there's some inconsistency. We need some of them, and others, and a third faction, but someone will still be missing. I don't know the chronology; maybe in the period that the sixth Heroes will depict, no one lived in the Dungeon yet.
Well, I don't know; maybe they'll be empty at first, and then add-ons will be released.
If we believe the lore, then dwarves also existed at that time; maybe they lived there? Never mind. We'll see when the game is released.
Be strong. Believe