The Codex of Blood

It has been two years since the Shadow Council summoning that resulted in the explosion of this once-great mausoleum, and the formation of the Bone Wastes. Now they are at war with an unbelievably powerful force on the inside. <name>, you must make your way into the Shadow Labyrinth to determine what they are up against, and to see if it poses a threat to us. Our spies speak of their use of a forbidden book of unholy summoning, known only as the Codex of Blood. Seek your answers within its pages.