On the Imperial Hive World of Ikara IX, Chaplain Kastor and Apothecary Polixis, brothers in blood as well as in battle, stand firm against the endless Greenskin horde. But a threat is looming. An invasion like no other assaults the broken city of Shebat, as the crazed warlord Urgork arrives to lay waste to the Imperial forces and capture a Primaris Marines for his own twisted ends. As Kastor and Polixis find themselves separated by the disaster that unfolds, the brothers must turn the tide of war to win the battles that rage within their very natures, as well as those upon the battlefield.

    Fell times have come again to the Imperium and a War of Faith appears inevitable. Standing in the way of catastrophe is Celestine, the Living Saint and one of the greatest heroes of the age. Only she can reunite the warring factions of the Ecclesiarchy and prevent a second Reign of Blood. Together with the Inquisitor Greyfax, Celestine and her allies must hunt across the shrineworlds of the Imperium and beyond to root out the evil behind the schism and burn it out with righteous, cleansing flame.