From publisher blurb:
Deep below the earth, in caverns lightless and unknown to man, live our nightmares: the spidery drow, the wild alien mind shredders and intellect devourers, and worst of all, the insatiable ghouls in their cities and empires.
This Open Design project created a fully-detailed underdark society of civilized ghouls. This includes some description of their gods, slaves, templates, new monsters, and unique magic, and then sets up all those elements within a multi-level adventure for roughly 9th to 12th level. The final result is a 160-page page adventure unlike any other, with lethal and new challenges for any experienced party.
Fully-mapped ghoul empire and underdark cities
More than 80 playtested encounters, many with tactical maps
A ghoul prestige class, the Imperial Hunter
Ghoul magic and items unique to the Imperium
And 8 new deadly monsters!