Changes

In 998.[[M41]], shortly before [[Abaddon the Despoiler]]'s [[Thirteenth Black Crusade]], [[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 [[Harlequin]]s and the [[Craftworld]]s 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 Chaos Marines were driven from the secret paths leading to the Library. The breach caused by the rampaging [[Sorcerer]]s was sealed, as . As a result, a section of the Webway was lost forever.{{Fn|4}}