I'm making some changes to the Age of Worms adventure path, and I want to make sure that I'm not badly screwing everything up. The ebon triad pretty well foreshadow a number of the adventure path's (Hextor -> Prince Zeech, Erythnul -> Bandits & Giants in Kings of the Rift, Vecna -> Library of Last Resort). I would like to replace the evil gods with fiends that the party are likely to interact with during the course of the adventure.
In my campaign setting powerful fiends are practically gods for all intents and purposes.
I would like to replace Hextor with Buldumek (the pit fiend advisor of Lashonna). I would like to replace Erythnul with Alakora (the marilith in Kings of the Rift). I, however, am having a tough time replacing Vecna with a neutral evil fiend. Yugoloths don't have a bunch of representation that I can see in age of worms. So I would like to replace Vecna with a named Yugoloth that the PC's can face in place of Darl in the Library of Last Resort. Anyone have a suggestion?