Upon arrival at a new world they intend to strip of its biomass, the Tyranids disgorge the "Alpha" swarm of bio-forms.The Alpha swarm contains the genetic material of that particular Hive Fleet's ruling Norn-Queen. The Norn-Queens control the evolutionary course of the Tyranid swarm. This action also crippled a tendril of Hive Fleet Leviathan. This disrupted the Hive Mind's coherency and the Tyranid creatures reverted to overly aggressive, animalistic behaviours, turning upon one another in an orgy of cannibalism. A biological plague created by using a Lictor's DNA as the foundation for the pathogen was injected into the Norn-Queen by Captain Uriel Ventris of the Ultramarines 4th Company. The forces of the Imperium have encountered only a single Norn-Queen, during the Battle of Tarsis Ultra. The synapse creatures then retransmit those orders to the lesser Tyranid bio-forms.
The Norn-Queens control the fleet and send orders to Tyranid synapse creatures on an invaded planet. The Norn-Queens are constantly producing Tyranid organisms, new bio-weapons, and starships from a planet's recently consumed bio-mass.
Although they are sentient beings unlike so many of the other Tyranid bio-forms, they spend their entire lives psychically arguing through the Hive Mind with their "sisters" about how the next swarm of Tyranids could be better adapted to the species' needs. All Tyranids have links back to a Norn-Queen, as the only way for Tyranids to reproduce is through this cloning technique. They then churn out through asexual reproduction all the countless types of bio-forms that make up the Tyranid Hive Fleet. They live upon massive Hive Ships in huge chambers at the centre of the Hive Fleet and ingest genetic materials. Extract from Magos Biologis Alder GarrickĪ Norn-Queen, also sometimes referred to as a Splicer-Beast, is the highly intelligent Tyranid bio-form that leads the great Tyranid swarms and directs the evolutionary paths they take as they adapt to each new environment or tactical need. Over time, the myriad improvements to the Hive Fleet's gene pool are melded with others, strengthening the entire race." Newly harvested genetic codes are assimilated, the prey's defensive measures are examined, and improved creatures are bio-engineered to overcome that resistance. It appears that the Tyranid "Norn Queens" or primogenitor organisms aboard the hive ships are capable of modifying their progeny in response to the environment and life-forms they encounter. The Magos Biologis of Mars have observed developmental DNA leaps between broods originating from different hive fleets that would take other beasts millions of years to achieve. " The Tyranids are without doubt the most rapidly evolving creatures in the galaxy.
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