Sanctus (Space Marine Battles Novella)

The Relictors are sent by the Inquisition to loot the repositories and libraries of a world on the cusp of annihilation. With the countdown to Exterminatus looming over them, they realise that even the Chaos Space Marines of the dreaded Black Legion are not the worst threat that they will have to face before they can escape, and that their true enemy may lie elsewhere.