From the front page of the PDF:
A One-Round Dungeons & Dragons® Living Greyhawk
Iuz’s Border States Metaregional Adventure
The Drinkers of the Cup of Midnight, in an attempt to prevent history from repeating itself, have decided that turnabout is most definitely fair play. To that end, the Shade wants to learn of the Old One’s darkest secrets behind his recent machinations – she asks you to infiltrate a religious center of the Old One himself. A one-round Iuz’s Border States Metaregional adventure set in the occupied Shield Lands for characters level 3-15 (APLs 6-12).
WARNING: This adventure is role-playing intensive and is set in locations and presents situations that may be extremely dangerous for paladins, clerics of good-aligned deities, or any good (particularly devout) PCs in general. There are definite repercussions for these types of PCs. In addition, this adventure contains many situations that may be
gruesome or inappropriate for less-mature audiences.
Resources for this adventure include Book of Vile Darkness [Monte Cook], Fiendish Codex I: Hordes of the Abyss [Ed Stark, James Jacobs, Erik Mona], Magic Item Compendium [Andy Collins, Eytan Bernstein, Frank Brunner, Owen K.C. Stephens, John Snead], and Spell Compendium [Matthew Sernett, Jeff Grubb, Mike McArtor].