Among the hallowed ranks of the Adeptus Astartes, few have attained such renown as Ortan Cassius - Ultramarines Chaplain and Master of Sanctity. Hero of the first Tyrannic War, his name is legend. When the hive fleets target the world of Styxia, Cassius leads the defence, marshalling the Ultramarines against the xenos monstrosities.
Read it because
It's a good old-fashioned tale of Ultramarines vs tyranids, with none other than the alien-hating Chaplain Cassius (and let's be fair, he has good reasons to hate these particular xenos) leading the fight.