FifthColumn's Curse of Strahd
Dusk elves are a race of elves native to or at least long established in Barovia. They have dark hair and tawny skin, and dress in drab cloaks. The seem to be a race in decline, only a few dozen have been confirmed to exist, in a ring of cabins circling the Vistani encampment near Vallaki. The leader of this group is said to be named Kasimir. These dusk elves are terse and aloof, but seem to be as capable hunters, rangers, and trackers as any elves.