Gereon is a planet in the Sabbat Worlds Cluster. It was invaded and occupied by the forces of Chaos, against who was waged a guerrilla war by the Gereon Resistance, a mixture of ex-PDF, ex-Imperial Guard, ex-Adeptus Arbites and civilians.
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The world was used by the Magister Anakwanar Sek to train his private army, the Sons of Sek. The Sons were his answer to the Blood Pact, in order to further his goal of gaining the title of Archon, taken by Urlock Gaur after the death of Nadzybar at Balhaut.
The traitor Imperial Guard General Noches Sturm was taken to Gereon after his capture by Sek's forces, in order for the Imperial mindlock to be removed. He met his end when elements of the Tanith First and Only came to Gereon to kill him. After his death, the Tanith integrated themselves with the resistance until such a point that they could leave. Crusade forces later retook the world in order to investigate a "cure to Chaos."