In the final days of the 41st Millennium, the regiments of fortress world Cadia battle desperately against Abaddon the Despoiler's 13th Black Crusade. In the hour of the defenders' greatest need, the Emperor heeds their prayers and sends forth one of His mightiest servants: a Living Saint. Appearing aflight in the blackened skies of Cadia, Saint Celestine brought the might of the Emperor's power to bear, smiting the forces of Chaos with holy fire.