They meet a duergar trader, Dooger T. Digger, and accompany him to the ruined beholder city of Ooltul. There, the gray dwarf assures them they will find someone who can help them locate the yuan-ti stronghold they seek.
Directed to a bar run by an aged mind flayer, the heroes find out that they are not the only ones seeking the artifact crown. They are asked to dispatch a beholder and his gang to protect the interests of the would-be informant – the slimy barkeep himself.
They agree, strongarm a devourer into giving up the location of the gang headquarters, and begin their assault.