Back in EFU:M there were explorations in the Underdark area that lead to supply ships with drow, the drow were usually strong NPCs and a challenge. The rewards were usually a good piece of loot among some potions.
I believe surviving drow or enthralled drow could have their own supply ships near the coasts in an exploration in EFU:R. However a nerf should perhaps be given to the drow loot found since there is likely no attempts on assassinations on players that hold them.