Nigon is the second underground race.

Arandor, I don't think it's that important whether it's a monster or a troll. I imagined a troll from The Lord of the Rings... In my opinion, the monster wouldn't differ much (it probably wouldn't look like the one in Heroes 3, and as I understand it, it won't be hairy), also a huge, possibly slightly hunchbacked creature with gray skin, a muscular body, and a terrible face. That's roughly how I imagine it. But the difference might be in this: monsters have huge hands with giant claws. The trolls from LOTR, as far as I remember, didn't have such claws; their limbs were more or less proportional. Although, "troll" sounds better than "monster," in my opinion. In principle, I'm not against it. ;)