Harlequin - The Black Library: Deep within the Webway, protected by terrifying sentinels and Troupes of Harlequins, lies the Black Library. The Black Library is spoken of as a Craftworld, which in form it may be, yet it is very different from the other Craftworlds of the Aeldari, for the Black Library exists only within the Webway itself.To reach this fabled realm, one must court madness itself, travelling secret passages through the Webway, evading the gaze of the horrifying entities that stand guard, and unlocking one of the library's cunningly hidden entrances amid veils of riddle and illusion.The Black Library houses all of the Aeldari's most precious knowledge, and is said to resemble a vast, impossible Craftworld that exists only within the Labyrinth Dimension. There is lore here regarding every deadly galactic mystery that the Aeldari have ever encountered. The true nature of the ancient star-gods, the fate of the forsaken Phoenix Lord Arhra, even the origins of Chaos itself are but the merest fragments of the Black Library's archives of the forbidden and the forgotten.In particular, the library's collection focuses upon all that the Aeldari know of Chaos, for it was Chaos that destroyed their civilisation and threatens them still from the Warp. Within the psychically locked rooms of the Seething Spiral lie grimoires of dark magic, their whispers and snarls shivering the air despite layers of runic wards. Beneath the Dome of Stars Extinguished, countless caskets of moonthorn imprison daemonic artefacts and essences.Glowing lights drift through chambers in which ancient blades and alien skulls rest upon rune-carved plinths. Perhaps most valuable of all the library's many treasures is the collected psychic lore of the Aeldari and the countless species they have encountered. Captured in the crystalline thoughts of the library's long-dead inhabitants, these spectral secrets drift upon the wind like half-remembered thoughts, waiting for a mind strong enough to snare them.On and on the dark corridors wind, a maze of starlit chambers and shadow-drowned oubliettes beyond count. Few mortals indeed have seen the inside of this sinister realm, and none would be foolish enough to speak of it; once someone has witnessed the true nature of the Black Library's sentinels, the fear of their vengeance lingers.There can be little doubt that, were the sanity-blasting secrets of this repository laid open to the Drukhari, the consequences would be bloody. Yet none amongst the aristocracy of the Dark City of Commorragh are foolish enough to waylay the visiting troupes of Harlequins openly, and the Laughing God's servants seem able to predict those snares that are laid for them in secret.Only Supreme Overlord Asdrubael Vect has ever dared to publicly cross these enigmatic warrior artists, for a terrible doom indeed is believed to fall upon those who do. Of all humans, only a handful of Inquisitors have ever entered the confines of the Black Library, and then only in the company of Harlequins and under the closest supervision.None have ever described their experiences in this mystical realm. These Inquisitors share a common bond with the Harlequins, for both are sworn enemies of Chaos and understand only too well the nature of the threat that faces the Aeldari and Humanity.Recently, during the recent 13th Black Crusade of Abaddon the Despoiler in 999.M41, the Chaos Sorcerer Ahriman of the Thousand Sons Traitor Legion was able to penetrate the Webway and forcibly enter the Black Library, attempting to gain access to the arcane lore hidden within as part of his quest to better understand the very nature of Chaos itself. However, a massive force of Harlequins and Aeldari warriors were able to drive the Chaos Sorcerer back.