Dark dwarves were also known as the Dark Soya Dwarves. They weren't natives of the Chaos Abyss, and they had a poor reputation in the other Planes.
As dwarves were one of the most ancient species, these descendants of the Titans had just as many subspecies as the elves. Since the entire dwarf species had countless subspecies, they naturally had their own unique dwarven culture.
While elves specialized in art and magic, the dwarves were outstanding in brewing alcohol, smithing, digging, and sculpting. As the children of the earth, dwarves would be born naturally skilled in mining, smithing, and construction.
In most dwarven societies, no matter what subspecies of dwarf they were, no matter if the dwarf was a commoner or the tribe leader, that dwarf would at least have one outstanding talent. If an adult dwarf was incapable of wielding a hammer to support himself, then he would be unable to survive in his own tribe.