Demonomicon of Iggwilv

The Demonomicon was a six-volume book written by the archmage Iggwilv. It was a comprehensive treatise on demonic lore that contained information about several demon lords, complete with instructions for summoning and binding them, as well as an extensive collection of spells and evil rituals.

Description
All six volumes of the Demonomicon were brassbound pages of parchment with dark covers made from demon leather.

Among some historical information on demon lords, the book detailed the ascension of Orcus to a demon lord, specifying that he spent some time as a nalfeshnee inhabiting the 400 layer of the Abyss at the same time when the gith race revolted against the mind flayers.

The book contained not only information about the demon lords, but also abundant demonic lore in general. It specified what kinds of demons certain evil individuals became after death.

The Demonomicon also contained information on the Abyss itself. It stated that the plane could regenerate a previously destroyed demon lord.

Information on other creatures was also available in the Demonomicon. When discussing the obyrith Pale Night, the book argued that she also spawned other races that inhabited the Prime Material plane, such as lamias and harpies.

Powers
Possession of the complete Demonomicon was believed to grant the reader with power to dominate all the demon lords described in its pages, paralleling the power Iggwilv herself had over those entities. However, over the book's history, no wizard succeeded in obtaining all six volumes.

History
It was said that the Demonomicon was based on a previous work known as the Tome of Zyx, but also contained abundant original research conducted by Iggwilv over the years.