Underdeeps of the Witch Lord

Publisher's blurb:

Underdeeps of the Witchlord, was a cornerstone dungeon of my campaign of that time. Created by Truan the Witchlord, advisor to the High King of Arisillon and one of the most powerful elf sorcerers to have ever lived, by the PCs' time the Underdeeps had been abandoned and almost forgotten since the Witchlord disappeared over a generation ago while looking for a long-lost family member. (I have a lot of notes regarding the recent - as in last 300 years or so - history of the lands of that campaign world: timelines, historical and mythical stories, bloodlines, etc.