Black Library - History: The Black Library is the only source of the Aeldari's knowledge concerning Chaos that has remained untouched. It was created by the Aeldari deity Cegorach, better known as the Laughing God, though for what purposes the god created this repository can only be guessed. The Black Library is spoken of by the Aeldari as a dark craftworld existing within the Webway, far beyond the reach of the Imperium of Man.Within are the collected tomes and writings describing the Aeldari's studies of the Immaterium and all the entities that live within it. These writings also describe all aspects of Chaos: its perils, promises and horrors.The Library is enclosed within a nearly impenetrable psychic barrier, and is watched and maintained by its Aeldari Guardian-Scribes, who collate and transcribe the knowledge of the Black Library, a task they have carried out since the Fall.The Black Library contains not just the Aeldari's knowledge of Chaos; any new knowledge of Chaos gained by any intelligent species of the galaxy is taken and kept within the Library. These include a copy of the Book of Magnus, the potent tome of sorcery created by the Thousand Sons Traitor Legion's Primarch or the Book of Lorgar written by the Primarch of the Word Bearers Traitor Legion that sought to spread the teachings of the Ruinous Powers, both written before the Horus Heresy.The Black Library is as much a source of knowledge for those who fight Chaos as it is a vault to keep dangerous knowledge hidden and protected from those who would misuse it. The existence of the Black Library is known to few, and even fewer are allowed access to it.The Library's collective psychic mind embodied in its Infinity Circuit defends itself, barring the weak and corruptible. Only those who have mastered the temptations of Chaos within themselves are able to enter.Two groups come and go at will: the human Illuminati and the Aeldari Solitaires, the most dangerous of the Harlequins. The Imperial Inquisitor Bronislaw Czevak was granted entry by the Black Council once to study the accumulated lore concerning Mankind's interaction with Chaos, but had to prove himself worthy of the honour.Inquisitor Jaq Draco also managed to find a way into the Black Library and steal the Book of the Rhana Dandra, known alternatively among Imperial scholars as the Eldar Book of Fate.The Chaos Sorcerer Ahriman of the Thousand Sons Traitor Legion sought entrance to the Library in his vain attempt to better understand his master, the mercurial Tzeentch, the Changer of the Ways and the Chaos God of sorcery. For many Terran centuries the Black Library and its guardians managed to repel this particularly troublesome would-be invader.Then in 998.M41, shortly before Abaddon the Despoiler's 13th Black Crusade began, Ahriman led his warband of Thousand Sons into the Webway in an effort to finally claim the Black Library. Engaging in furious battles with the Harlequins and the forces of the craftworlds of Ulthwé and Lugganath, Ahriman advanced to within sight of the Library itself.However, several major arteries of the Webway were choked with the dead before the Heretic Astartes were driven from the secret paths leading to the Library. The breach caused by the rampaging sorcerers was sealed, but as a result, a section of the Webway was lost forever to the Aeldari.