Duergar

The Gray Dwarves or Duergar, live deep in the Underdark. After delving deeper than any other Dwarves, they were enslaved by Mind Flayers for eons. Although they eventually won their freedom, these grim, asken-skinned Dwarves now take slaves of their own and are as tyrannical as their former masters. Physically similar to other Dwarves in some ways, Duergar are wiry and lean, with black eyes and bald heads, with the males growing long, unkempt gray beards. Duergar value toil above all else. Showing emotions other than grim determination or wrath is frowned on in their culture, but they can sometimes seem joyful when at work. They have the typical dwarven appreciation for order, tradition, and impeccable craftsmanship, but their goods are purely utilitarian, disdaining aesthetic or artistic value. Few Duergar become adventurers, fewer still on the surface world, because they are a hidebound and suspicious race. Those who leave their subterranean cities are usually exiles.