Tyranids - Used
The Tyranids are the most alien of the races to infest Imperial space, for they come from beyond. Their hive fleets stretch out like tendrils, great chitinous bio-ships drifting in brooding silence. Once the remorseless shoals of the bioships detect the presence of a prey world, they close upon their target, grasping it like some many-tentacled beast seizing its food. In the ensuing invasion, the world will be consumed, for the Tyranids hunger for all living matter.