From the release:
Wild-eyed sailors tell a tale of the nefarious pirate ship Devil’s Shadow and its mysterious disappearance. Of the ship’s crew, only three souls ever returned, now guided by some unseen evil. This trio disperses as quickly as an ill wind, staying only long enough to form contracts with desperate men. Their goals remain a mystery, and the three otherwise go wherever the gales send their cursed ship.
Scarabs are enormous, ravenous insect-like creatures native to the Trembling Waste. Skorne beast handlers drive scarabs mad with hunger, then loose them onto the battlefield in advance of a main force to consume any living thing in their path. The terrifying sight of these voracious beasts swarming over defenses has caused even veteran soldiers to flee for their lives.
Venators have mastered the unique firearm called the reiver. These horrific weapons fire bursts of iron needles that shred their targets. With a lethal swarm of concentrated fire, Venators tear into the most imposing targets, making them among the most valued specialists in the Army of the Western Reaches.