Codex Adeptus Astartes: Grey Knights (2017), p25 — M41 Age of Maledictum

Plagues of Ultramar

The Exactors send Strike Force Cautery to Ultramar to aid the Ultramarines and the Ordo Sepulturum in the fight against the Death Guard, who are spreading daemonic plagues across the region. With knowledge of the Heretic Astartes' viral proclivities gleaned from the tomes in the Sanctum Sanctorum, the Grey Knights are able to cripple two vectoriums of the Death Guard's 4th Company and eradicate the Consumptiphagus strain of the Eater Plague.