Book of Vile Darkness

The Book of Vile Darkness was a tome created by Vecna. Having been contributed to by evil creatures from across the multiverse, the book compiled some of the most twisted and vile thoughts, plots, and ideas.

Description
There were a total of six copies of the Book of Vile Darkness, as well as eighteen imperfect or outright fake copies. The original book, created by Vecna had a cover crafted from demon leather with a golden binding resembling a cruel, fiendish visage. Unintelligible lines and symbols adorned its cover. As many creatures contributed to the book, with no concern for its uniformity, the tome is full of mismatched pages, written in different hands, although all equally vile.

History
The Book of Vile Darkness roamed the universe but, wherever it was to turn up, mayhem ensued. In the mid 9th century, the priesthood of Vecna in Margoth discovered one, which prompted them towards more and more evil actions, including magical experimentation on various creatures, which resulted in the creation of the Nhagruul Dragonspawn, as well as other monsters, transforming Althaea, an innocent wizard kidnapped by the priests, into a Star Spawn Larva Mage, and, eventually, turning on one another until only Nhagruul, the head priest remained. Although he was growing close to the end of his life, Nhagruul transformed himself into a Vampire in order to continue to spread the Book's evil indefinitely. Living for many centuries as a vampire in the derelict ruins of Margoth, Nhagruul sunk further and further into madness and his fanatical devotion to the book only grew.

In 1455, the Cult of Scrix set out in search of the Book of Vile Darkness, as it was the only source that contained information about the ritual of the Abyssal Supercede.

Powers
The Book of Vile Darkness, if read by an evil creature, influenced the reader to descend further and further into evil, until they became truly depraved, although the secrets within its pages often allowed the reader to grow much more powerful. To good or neutral creatures, the Book was dangerous, casing physical harm to those who read in and, possibly, driving them insane. The tome exuded malice and those in its vicinity were plagued by nightmares and twisted thoughts. Spreading corruption wherever it went, the book could never be truly destroyed, for, as long as there was evil in the universe, it would reappear, although having a Solar tear it in half would prevent it from doing so for a century.