Gereon is a planet in the [[Sabbat Worlds]] Cluster. It was invaded and occupied by the forces of Chaos, upon whom was waged a guerilla war by the Gereon Resistance, a mixture of ex-[[PDF]], ex-[[Imperial Guard]], ex-[[Adeptus Arbitus]] and civilians. The world was used by the warlord [[Anakwanar Sek]] to train 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]]. Here, the traitor [[Noches Sturm]] was taken after his capture by [[Chaos]] in order for the Imperial mindlock to be removed. He met his end when elements of the [[Tanith 1st First and Only]] came to Gereon to kill him. After his death, the Tanith integrated themselves with the resistance until such a point that thay could leave. Crusade forces later retook the world in order to investigate a 'cure to Chaos'.