Alton Abaeir is a drow that Wanda 'unknown' & Vatraethra Ironfist discovered in the Goblin Caverns. They helped each other and so the party led him to the entrance.
I really do try to make most of this original, but since Forgotten Realms is an integral part of the world I can't help if anything is used without formal permission, but is still "fair use" as I am just using this for my private games.