Wrath of the Chaos Sun
The Wrath of the Chaos Sun was a devastating event in 010.M37, taking place shortly after the end of the Age of Apostasy. The red giant star at the heart of the Maxil Beta System goes supernova, exploding in an expanding cloud of flames covered in Warp energy that spreads across nearby systems. The inhabitants of every world for hundreds of light years are exposed to the Warpflame and are either turned into Mutants or possessed by Daemons. In response, the High Lords of Terra order the mobilization of whatever forces are close at hand. Grey Knights, Imperial Guard, Space Marine Chapters, and Orders of the Sisters of Battle all respond to the call and purge the Chaos taint. The battle helps to heal the wounds opened by the civil war of the Age of Apostasy.1