Witness (Warhammer 40,000)

On the war-wracked world of Margentum, Captain Danel Prestoff and the Brindelweld Ninth Imperial Guard stand against traitors, heretics and' something else. Something alien. Something other. As events spiral out of control, Prestoff and his men find themselves on the brink of destruction. When reinforcements arrive, it seems that all is saved. But will the new arrivals, mysterious, silver-armoured giants, bring the Brindelweld victory' or damnation? Read it because
A Grey Knights story by Joe Parrino.