Tyranid

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Tyranids (often abbreviated Nids) are eusocial aliens invading the Milky Way in the Warhammer 40,000 setting.

Attributes

Tyranids are a strain of organisms that come in a wide variety of forms, from worm-like scavengers to multi-kilometer-long creatures capable of interstellar travel. Many ground combat vectors of Tyranids are bilaterally symmetrical with six appendages, but there is a lot of variety among the many Tyranid strains.

Most Tyranids are not sapient and don't make use of technology, although they have at their disposal various organs and organisms to serve as weaponry.

The Standard behavior of Tyranids is for large groups of space based organisms (known has Hive Fleets) to move from star system to star system in search of earthlike planets. Upon discovery of earthlike planets, the Hive Fleets will deploy large numbers of smaller creatures to destroy any organisms that pose a threat while other organisms devour everything composed of Biological matter on the surface. This material is absorbed by the Hive Fleet in orbit for sustinance through links known as capilary towers, after which the hive fleet moves on in search of other worlds on which to feed on, leaving the formidably habitable planet barren and lifeless.

Tyranid Strains

• Tyranid warriors-Elite Soldiers/command and control
• Gaunts (Termagaunts, Hormagaunts, etc.)-Primary Tyranid Infantry with many subvarients
• Genestealers-Infantry/Biological Inflitration
• Carnifexes-Heavy assault
• Zoanthropes, Psionic Artillery

History

The true origin of the Tyranids is unknown; they are invaders from outside the Milky Way galaxy. They might have somehow evolved naturually, been created like the Orks as a biological weapon system gone wrong, or actually be the agents of some other alien power.

The first major incursion of Tyranids was Hive Fleet Behemoth. Behemoth hit hard, devouring systems one at a time, including a few Imperial Worlds, before entering the territory of the Ultramarine Chapter of Space Marines, known as Ultramar. The fleet eventually decended upon the Capital of Macragge, where the Ultramarines managed to destroy the hive fleet, albeit with a massive loss of personnel and equipment.

The second major incursion of Tyranids was Hive Fleet Kraken. Unlike Behemoth, Kraken broke up into numerous smaller fleets to attack multiple worlds at once, augmenting it's forces with Genestealer cults, allowing it to more quickly devestate large swaths of Imperial Space, although the smaller forces were easier to resist. The ravaging stopped when the majority of Kraken's forces descended upon the Eldar Craftworld of Iyanden: much of the Craftworld was devastated, and millions of Eldar were killed, but the attacking Tyranids were eventually repulsed. Most of the shattered remains of Hive Fleet Kraken are currently moving upon the fringes of the Tau Empire.

The most recent Tyranid incursion is Hive Fleet Leviathan, which is far larger than the previous two hive fleets and is currently moving towards Holy Terra. Weather this is the entirety of the Tyranid forces or there are other (and possibly larger) Tyranid forces outside the Milky Way is unknown.

Organization

All Tyranids possess some level of psionic ability and follow the telepathic instructions of a collective consciousness known as the "Hive Mind". Particularly advanced Tyranid forms --known as "synapse creatures" --serve as command hubs for less intelligent Tyranid variants. Destruction of synapse creatures in an area can cause lesser strains to lose coordination, go insane, and even turn on each other and rip themselves to pieces.

Threat Assessment

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