Tyranids

The Tyranid threat is a menace unlike any other faced by the Imperium, massive in scale and wholly alien in its nature and need to devour, not just mankind, but all life in the galaxy.

The Tyranids are a vast swarm of predatory beasts driven and controlled by a single Hive Mind: one flesh, one will and one biology, all designed to consume and absorb biomass on a monumental scale and focused solely on satiating a hunger without end. From the cold depth of intergalactic space they have come - the tendrils of the Great Devourer - an all destroying swarm composed of billions of organisms, each one the agent of a great and immortal intelligence. They have left nothing but dead husks of former life-bearing worlds in their wake, and if the Imperium cannot stop them, all hope is lost.

In battle the Tyranids are a horror beyond comprehension, a monstrous tide of merciless claw, venom and fang that cannot be bargained with, reasoned with, or surrendered to. It strikes with the relentless fury of a rabid beast, yet it is driven by a cold and alien intellligence that makes every component of the swarm far more dangerous than any mere animal could ever be.

Since the coming of the Tyranid menace, the Deathwatch and the Imperium's armed forces have seen them rightly as a priority theat that must be met with and defeated, lest Mankind itself some day perish in its jaws.