Duergar

"They'll come for you in the dead of night. Pulling themselves from the earth itself like the accursed undead. Before you know it they'll drag you down, down into those black abominable tunnels where you'll never see the light of day again." – Explorer's Corp. Adrian Torchbearer

The duergar are a terror hidden beneath the land and mountains of Riltar. At first glance, they appear to be dwarves; somewhat short with very stocky bodies and great beards. However, duergar have ashen to deep onyx black skin, with white milky eyes and always white hair. Hated enemies of the dwarves, the duergar hold hatred for all people that exist on the surface of the world. 

Rather then killing those that they come across, the duergar lead raid parties onto the surface to capture all that they can. The dwarves tell that those captured by the duergar are enslaved beneath the surface, but there has never been a single recounting tale of someone escaping the dueragar's grasp.

Duergar

The Terror of Riltar King_Justice