The Liber Mortis is the best source on Necromancy available to the scholars of the Old World. It was written by the Necromancer Frederick van Hel, better known to later generations as Vanhel. The one complete surviving copy of the book is kept under lock and key in the vaults of the Great Cathedral of Sigmar in Altdorf and can only be studied by the purest-hearted scholars, and even then only after special dispensation from the Grand Theogonist himself. Vanhel was a Necromancer at the time of the Great Plague and compiled his masterpiece from translations of the Books of Nagash. It is this book and its copies that have caused so much horror and death in the lands of the Old World.