Dark Elves

The dark elves (sometimes known as deep elves or Bäe'Sylvaan) live deep underground and are insular. Dark elves look like their surface-dwelling cousins but with skin that is grey to blue, coal-black hair and red eyes. They occasionally trade with the dwarves but seem content to live apart from all other races. Unbeknownst to others, they have a sprawling, metropolitan and decadent civilisation that spans the Underwild – an underground cavern system the size of a nation.

[Schism? Split from the surface elves after the Fall of Aderannor? The dark elves were the ones who believed that the Fall was not a message from the gods, or who interpreted it differently than the orthodox.]