Drow

The drow chose a life of self-exile to the Blazing Isles in ages past, following a violent schism with the other elves. Driven from the mainland, they dwell in the inaccessible volcanic islands just visible off the coast of the mainland.
The drow have established a convoluted series of enclaves in the vast volcanic caverns beneath the isles of the archipelago. They continue to pursue their own way of life below the surface, including the practice of necromancy, while an underclass of servitors labor on the surface above.
Xenophobes with delusions of racial superiority, there is still some trade between them and the mainland - in illicit black markets in Grayhaven, and openly in the bazaars of Slew.