Shenlong is a former Imperial Forge World located in the Ultima Segmentum that is now a Dead World. It had been a Forge World for time immemorial, having been settled since the Dark Age of Technology. The world was captured by the Chaos Space Marines of the Word Bearers Traitor Legion in the late 41st Millennium.
Not long after the planet was captured and subjected to the horrors of Chaos, the Blood Angels Chapter of Space Marines launched an assault that liberated the world from the Word Bearers' grip. However, the Blood Angels in this assault force had been manipulated by the corrupt Inquisitor Ramius Stele to believe that their fellow Battle-Brother Arkio was a reincarnation of the Blood Angels' Primarch of Sanguinius in the hopes of turning them to the service of theDark Gods like himself.
When the population learned that Arkio might be the reincarnation of a sacred son of the God-Emperor and Omnissiah, they rallied to the side of Arkio and his cause. Arkio, increasingly under the influence of Chaos, intended to launch an Imperial Crusade against the Forces of Chaos and chose 1,000 Shenlongi citizens to serve as his "Warriors of the Reborn."
When the other Blood Angels eventually defeated and slew both Arkio and Inquisitor Stele, the Loyalist Space Marines watched as the Shenlongi proved all too willing to revert to their loyalty to the Word Bearers and the Ruinous Powers. Deeming the world hopelessly tained by Chaos, the Blood Angels' Chief Librarian Mephiston ordered the world to be swept clean of all life by an Exterminatus assault from orbit. Today Shenlong is classified as a Dead World by the Imperium.
- Blood Angels Omnibus (Novel) by James Swallow