Prince of Undeath (E3), softback adventure for D&D 4th edition, by Bruce R. Cordell and Scott Fitzgerald Gray
“Face The Ultimate Evil
Orcus, the Demon Prince of Undeath, craves the power of the Raven Queen and mastery of death’s domain. The key to his ascension – and the secret to his destruction – lies buried in the heart of the Abyss. As heroes chase Orcus into the abyssal depths, evil opposes them at every turn, and each victory brings them closer to their final fate.
Prince of Undeath is an adventure that takes characters from 27th level to 30th level. It can be played as a stand-alone adventure or as the final part of an epic series that concludes the storyline begin in H1: Keep on the Shadowfell. This folder includes two adventure books and a double-sided battle map designed for use with D&D miniatures.”