Tome of Forgotten Powers

"The decrepit tower of Karazhan once housed one of the greatest powers Azeroth has ever known: the sorcerer Medivh. Since his death, a terrible curse has pervaded the tower and the surrounding lands. The spirits of nobles from nearby Darkshire reportedly walk its halls, suffering a fate worse than death for their curiosity. More dangerous spirits wait within Medivh's study, for it was there that he summoned demonic entities to do his bidding. However, the brave and foolish are still relentlessly drawn to Karazhan, tempted by rumors of unspeakable secrets and powerful treasures."