It is ten years since the events of Chaos Rising and Sub-Sector Aurelia has been in a constant state of warfare with the Imperium struggling to retain control. The apparent betrayal of the chapter by Gabriel Angelos and his Space Marines has shaken the Blood Ravens and now the Imperial forces are beset on all sides by hostile aliens. Retribution allows the player to select the race of their choosing in a battle to determine the very survival or destruction of the entire sector.