In the midst of a Tyranid invasion, a Black Ship arrives to harvest a planet’s warp-sensitive souls.

As the Imperial forces desperately hold out against an Ork onslaught, an elite squad of Kasrkin are sent on a special mission. Learn just what it means to pay the tithe and how not even catastrophe comes between the Administratum and their due.

As Sa'kan of the Salamanders continues his hunt for Illuminor Szeras, an Ultramarines Apothecary on a vital mission joins him. Can Sa’kan manage to put his duty before his need for vengeance?