Demonomicon of Iggwilv

"Demons are painfully difficult to summon and control. It is not a burden for the weak of heart or the weak of spirit."

- From the Demonomicon

The Demonomicon, also known as the Fiendomicon, was a seven-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 volumes of the Demonomicon were brassbound pages of parchment with dark purple covers made of demon leather. It was held shut by a clasp in the shape of a three-fingered demonic hand.

Among some historical information on demon lords, the book detailed the ascension of Orcus to demon lord status, specifying that he spent some time as a nalfeshnee inhabiting the 400 layer of the Abyss at the same time that the gith race revolted against the mind flayers. The book also contained treatises on Fraz-Urb'luu, Juiblex, Pazuzu, and Zuggtmoy.

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. Each volume of the Demonomicon contained the true names of multiple different demons.

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.

Every volume of the Demonomicon contained information on the same spells, all created by Iggwilv: dolor, ensnarement, exaction, imbrue, implore, minimus containment, and torment.

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 volumes.

Any volume of the book was capable of increasing the strength of conjuration spells such as planar binding against demons and other evil creatures. The first few pages of each volume were blank and functioned as renewable material components for soul-binding spells such as magic jar, minimus containment, and trap the soul. Whenever a creature was imprisoned within a volume of the Demonomicon, its visage appeared as a drawing on that page's parchment whose appearance changed every time the book was opened. Creatures trapped inside the book could communicate with outsiders via spells such as detect thoughts, dream, and Rary's telepathic bond.

History
The Demonomicon was based on a previous work known as the Tome of Zyx. All content from the original tome was copied over to the Demonomicon, but it also contained abundant original research conducted by Iggwilv over the years.

Although it was generally believed that the Demonomicon only had six volumes, a little-known seventh tome was discovered in the Wells of Darkness.