This is interesting. Not certain I knew this.
via Warhammer 40,000 Facebook
In the wake of the Battle of Macragge, Chaplain Cassius founded an elite cadre of Tyranid hunters from the Chapter's embattled survivors, called Tyrannic War Veterans. To these valiant battle-brothers, he imparted wisdom earned from his time among the Deathwatch. Let us know what you think of this cool snippet of lore.