Black Dyar exhibit great genetic diversity, but almost all have skin which ranges from dull grey to jet black. They often possess white bony ridges on their arms or legs, have pointed ears, sharp claws and teeth. They are often found in the northern mountain ranges near to the seat of the Underking.
Though similar in many ways to their paler southern cousins, the black dyar have never presented as great a threat to humanity. Though capable of fashioning weapons they appear to be less warlike, and substantially less numerous than the other dyar, and though conflicts have arisen in the past between them and the various Northlander tribes, they have mainly taken the form of small skirmishes.
Freehold legends often speak of the black dyar with a curious mixture of revulsion and acceptance.