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Norn-Queens (also known as Splicer-Beasts)[Needs Citation] are the productive parts of the Tyranid swarm. They live upon massive Hive Ships in huge chambers at the centre of the Hive Fleet and ingest genetic materials, churning out all the countless types of creatures that make up the Tyranid Hive Fleet. All Tyranids have links back to a Norn-Queen, as the only way for Tyranids to reproduce is via this cloning technique. It is said that they lead the Tyranid forces and direct the evolution of the Tyranid race.[Needs Citation]

Reproductive Methods

Norn-Queens require a constant supply of fuel, in the shape of genetic material, in order to reproduce or bring forth new Tyranid life forms. This mainly consists of the fluids formed in Reclamation Pools, that are pumped up into the Hive Ships through massive Capillary Towers. Genetic material is also supplied directly to the Norn-Queen via living creatures and scavengers, such as Coffin-Crawlers. All this, including transport creatures, is pumped into the great jaws that are located at the top of the Norn-Queen, and synthesized by the Queens genetic shredder organs. The dissembled DNA structures form a gene-bank, which provides the raw material from which new creatures are created. Once a type of bio-construct has been designed more identical creatures can be cloned by the Norn-Queens.[Needs Citation]

Norn-Queens are capable of bringing forth new bio-constructs in a variety of different ways, each designed to ensure maximum efficiency. Most bio-constructs are born as tiny wriggling larvae or may begin life as eggs that must be nurtured further before they hatch and develop into adults. Clusters of eggs spill from rows of ovipository orifices along its flanks, fluid filled depressions on its upper surface writhe with maggot-like larvae, fetal sacs hang like ripe fruit from umbilical branches, and huge larval Teleporter Worms burst from incubator pouches on the Norn-Queen's sides. Simpler bio-constructs may emerge already in their adult form to be gathered and directed by the horde of creatures that feed and serve the Norn-Queen.[1]

The Hydra effect

Upon the extinction of the class of xeno-form known as a Norn Queen, a psycho-temporal event approaching level Gamma 12 is generated – a level sufficient to temporarily obscure the light of the Astronomican. It is believed that this phenomenon represents the 'death knell' of said xeno-form, and that its purpose is to trigger those bio-vessels that intercept the signal to calve. This has been dubbed the 'Hydra effect', for, upon the death of one Norn Queen, a number of others are calved and thus the advance of the Tyranids is merely slowed, not stalled.[2]

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Tyranid Planetary Forces
Commanders Norn-QueenHive TyrantNeurotyrant (Neuroloid) • BroodlordNeurothropeTervigonTyranid PrimeTrygon PrimeMalanthrope
Elites BiovoreTyrant Guard (Hive Guard) • Lictor (NeurolictorDeathleaper) • LeaperPyrovoreVenomthropeZoanthrope
Troops Tyranid Warrior (Shrike) • RavenerGenestealerGaunt (TermagantHormagauntBarbgauntNeurogaunt) • Ripper (Sky-Slasher)
Monstruous Creatures Carnifex (ThornbackStone CrusherScreamer-Killer) • DimachaeronExocrineHaruspexMaleceptorPsychophageSporocystToxicreneTyrannofex
Gargantuan Creatures CereboreDactylisHieroduleMalefactorMawlocNorn EmissaryNorn AssimilatorTrygon
Bio-Titans DominatrixHierophantViciatorNautiloidVermis
Flying Creatures GargoyleHarpyHarridanHive CroneTyrannocyte
Spores Meiotic SporeMycetic SporeSpore MineMucolid Spore
Unique Tyranids SwarmlordDoom of Malan'taiOld One EyeParasite of MortrexRed Terror