Necrotelicomnicon
From A KoL Wiki
The Necrotelicomnicon (also known in Latin as the Liber Paginum Fulvarum) is a book dedicated to contacting all manner of horrifying demons and other otherworldly denizens of darkness. Legend has it that the mad Arab Al Aksandir Garambel wrote it after he was driven insane by his very first summoning, a terrifying entity known only as Wa'tz'ynn.
(In-game plural: copies of the Necrotelicomnicon)