One of the most horrifying race of xenos encountered by the Imperium of Man in the 41st Millennium are the hiveminded Tyranids. Unlike many of the other foes of Mankind, the Tyranids do not fight for honour, glory, or to reclaim lost empires. The only purpose of these terrifying xenos is to consume planets; stripping them of biomass and rendering them lifeless rocks. Unlike many of the other threats in the 41st Millennium, the Tyranids are extragalactic rather than native to the Milky Way galaxy and enter in great Hive Fleets comprising of vast bioships. The Adeptus Mechanicus of Mars speculates that Tyranid sightings occurred long before the creation of the Imperium. Three major Hive Fleets have been recorded entering the Milky Way galaxy: Leviathan, Behemoth, and Kraken. To date, no two Hive Fleets have come from the same direction leading to fears that the Milky Way may be surrounded by the ever consuming Tyranids.
Battle vs. Arachnids and Zerg Swarm (by Deathblade 100 and Monkey Doctor 33)