Hive Fleet - Other Hive Fleets: There are many other hive fleets known to exist in the galaxy or to be approaching it from the vast void of intergalactic space. Several of these hive fleets are splinter fleets of the original three to invade the galaxy and include the following:Hive Fleet Ouroboris - When Miriamulus the Elder, the then-cardinal of Thracian Primaris recorded the history of the "Legion of Ouroboris" in the 36th Millennium, this account detailed attacks in the Helican Sector in an earlier age, thousands of standard years before. The legion was described as consisting of "winged monsters" that descended from the heavens and stripped the countryside of all life, "vomited from the bellies of great beasts which clouded the stars with their numbers." An analysis of the Warlord-class Titan Mechanica Cranus, a cited veteran of the Ouroboris Wars, revealed distinctive bio-plasma scarring and pyro-acid burns now known to be consistent with the damage caused by Tyranid biomechanical weapons. It is believed the Space Wolves Space Marine Chapter also possesses trophies of Tyranid-like bioforms dating from this epoch, including the so-called "Kraken's Egg." The cardinal attributed the Emperor Himself with leading a crusade that caused the Beasts of Ouroboris to fall upon themselves, culminating in a mighty twelve-day-long battle over a Warp rift dangerously close to the Eye of Terror. However, augur-dating techniques place the battle damage sustained by Mechanica Cranus as occurring post-Heresy, making the Emperor's embodied presence extremely unlikely. It is theorised that Hive Fleet Ouroboris may have consisted of some Tyranids who were drawn ahead of the other fleets by treacherous Warp currents and deposited at the Eye of Terror in the Milky Way. This theory could also explain the presence of Tyranid splinter fleets in Segmentums other than the Segmentum Tempestus.Hive Fleet Tiamet - First encountered in the large, double binary system on the Eastern Fringe known as the Tiamet System, it is theorised by Imperial xenographers that this hive fleet was a Tyranid implant-probe, possibly molecular-coded DNA, sent ahead (perhaps hidden within cosmic debris or solar winds) to seed the star system and spread of its own accord ahead of the arrival of much larger hive fleets. This system was discovered by an Imperial Explorator fleet hailing from Triplex Phall in the 35th Millennium. The Tiamet System contained seven life-sustaining worlds and a host of lesser planetoids. The Explorator fleet discovered to their cost that every biosphere in the system was a Death World of the most voracious kind. Xenologists eventually determined that the life all over the system shared a common genetic ancestry and had developed various ways to get from world to world to seed new territory. Realising their own craft could be contaminated from entering the system, the Explorators quarantined themselves in Tiamet rather than infect the wider Imperium. They were to survive and report for another one hundred and sixty-two solar hours before succumbing to the lethal denizens of the fecund realm. The Tiamet System's worlds were systematically fusion-bombed on several occasions but life was never extinguished there; it now lies within the area swept over by Hive Fleet Kraken. Tiamet's primary base of operations in the system is the Jungle World of Ziaphoria which it has begun to "tyrannoform" into some type of biomechanical psychic resonator whose purpose remains unknown and worrisome to the Ordo Xenos of the Inquisition. The hive fleet continues to guard its conquered territory with single-minded ferocity. Only the Deathwatch Space Marines of the nearby Watch Fortress Haltmoat -- and Inquisitor Fidus Kryptman, who came out of his long exile to join them -- had any inkling of the threat posed by the immense psychic resonator of Tiamet. The theories they discussed long into the night were so wild, and the other threats facing the Imperium in the Era Indomitus so dire, that they were given little credence by the wider Inquisition.Hive Fleet Collossus - Several large nomadic fleets of curious, conch-like spacecraft apparently grown from natural stone were sighted through the Segmentums Tempestus and Ultima late in the 38th Millennium, bearing many similarities to hive fleets. The centauroid bio creatures aboard them (which may have been members of the species recorded in Imperial archives as Zoats) were known to communicate, albeit telepathically, with other races -- unlike any other Tyranid organism before or since. The denizens of Colossus claimed to be slaves escaping their oppressors, but their frequent contacts with other alien races and attempts to settle in Imperium space caused them to be declared Xenos Horribilis early in the 39th Millennium. The xenocidal fifty-year-long Zorastra-Attila Wars followed as the entire race hurled itself against Humanity with terrifying ferocity, revealing their true, murderous nature. The last known Collossus vessel was eventually destroyed in 226.M39 above the world of Zorastra. The impact of its shattered remains rendered the northern hemisphere of that world uninhabitable until late in the 41st Millennium. Only now are Adeptus Mechanicus Explorator expeditions beginning to piece together the truth. Due to inconsistent records, Imperial scholars cannot agree as to whether Collossus was wiped out during this campaign or during the Helican Crusade. Indeed, it is known that in 897.M41, elements of what has now been identified as Hive Fleet Collossus invaded the Imperial Civilised World of Thressiax. Imperial forces on the planet were unable to stop the constant influx of invaders and Imperial High Command issued a ruling for all forces to withdraw so that the Imperial Navy could conduct an Exterminatus action from space, and in the process leave the settlers of Thressiax to their fate. However, the Space Wolves Chapter's Wolf Lord Bran Redmaw, resupplying his Great Company upon Thressiax at the time, objected fiercely to the command. He sent two full squads of Grey Hunters to reinforce the spaceport of Montberg and give the Imperial settlers a chance to evacuate. At the spaceport, the Grey Hunters set about training the settlers in anti-Tyranid tactics. When the forces of Colossus attacked, these ad hoc troops managed to hold the walls of the spaceport long enough for the settler families to escape off-planet safely. Six Grey Hunters survived and the Imperial High Command ordered them to be stripped of all Astartes honours for disobeying a direct command, but Bran Redmaw instead promoted all of them into his personal Wolf Guard.Hive Fleet Naga - Hive Fleet Naga was a relatively small hive fleet that invaded the galaxy from the Eastern Fringe somewhere to the galactic north of the T'au Empire in 801.M41, destroying countless xenos domains and devouring several Asuryani worlds. The Aeldari referred to this hive fleet as Shai'naid, the "Endlessly Winding Serpent," and only through the combined efforts of Asuryani fleets from Idharae, Iyanden and Malan'tai craftworlds, was Hive Fleet Naga destroyed in 812.M41. Unfortunately, the Tyranid Hive Mind absorbed several dozen samples of new biomass, including the DNA of the Aeldari, gaining valuable experience of Aeldari military strategies and capabilities.Hive Fleet Dagon - Hive Fleet Dagon, believed to be a splinter fleet of Hive Fleet Behemoth, was the first major Tyranid incursion into the Jericho Reach region of the Ultima Segmentum. The Shadow in the Warp cast by the Tyranid Hive Mind within this volatile region of space first heralded the arrival of this new and terrible hive fleet in 812.M41. Communication between parts of the Achilus Crusade and the reconquered regions of the Jericho Reach was lost without warning. Particularly affected was the Orpheus Salient of the Achilus Crusade that was lost to communication and access with the rest of the Reach behind the hive fleet's crawling Shadow of Warp interference. In 814.M41, the Deathwatch warship Thunder's Word entered the Freya System to investigate the silence of an astropathic relay. It found no trace of the relay and indeed no trace of any life in the Freya System. Preparing to leave the star system, the Thunder's Word encountered two Tyranid drone ships. Its hull scored and pitted with acid and its magazines nearly exhausted, the Thunder's Word arrived at Watch Fortress Erioch bringing news that the Tyranids had come to the Jericho Reach.Hive Fleet Gorgon - The Gorgon was a splinter fleet of Hive Fleet Behemoth that invaded the space of the T'au Empire in 899.M41, it represented the T'au's first horrific encounter with the Tyranids; the hive fleet was destroyed in 903.M41, through the combined efforts of the T'au Fire Caste and the Imperial Guard. Regions of the T'au Empire that have been left barren by the rampaging hive fleet are known as the "Zone of Silence."Hive Fleet Kronos - Where Hive Fleet Kronos travels, the Shadow in the Warp is at its most suffocatingly powerful. So strong is the psychic connection between Kronos and the Hive Mind, that a stifling aura of null power drifts ahead of its invasion swarms, agonising psychically active foes and draining their spirit energy to bolster its own hosts. Even as this phenomena throws the enemy into fearful confusion, thousands upon thousands of warrior-forms advance, unleashing a storm of organic missiles; Kronos avoids engaging its prey at close range when possible, for the prey it hunts revels in brutal close-quarters fighting, and thus a ranged kill is a more efficient method of extermination.Hive Fleet Scarabus - Hive Fleet Scarabus was annihilated by the troops of the 9th Cadian Shock Troopers Regiment at the walls of Fortress Carcasson in 937.M41. The 9th Cadian did not lose even a single company of troops in this conflict.Hive Fleet Locust - In 945.M41, this hive fleet largely wiped out the population of the Imperial world of Ulmore before the arrival of the Ultramarines Space Marine Chapter in which the valiant Sons of Guilliman managed to drive back the hordes of the Great Devourer during the subsequent Battle of Ulmore.Hive Fleet Lotan - Vectoriums of the Death Guard's 4th and 7th Plague Companies engage the Tyranids of Hive Fleet Lotan amidst the steaming jungles of Hesp. When the swarms deploy Toxicrenes and Venomthropes to poison the environment, the Death Guard respond with plague spells, Virus Bombs and daemonic diseases. With neither side willing to back down, the atmosphere of Hesp becomes ever more toxic until the jungles, and even the warring armies, are reduced to a gory, bubbling soup. The first Tyranid Hive Ship to taste this poisoned slurry recoils, its proboscis melting, and is bombarded into oblivion by the rest of its fleet. The Jungle World of Hesp is left as an endless sea of toxic slime, too virulent for even the Hive Fleets to devour.Hive Fleet Perseus - This Tyranid hive fleet battled the Ultramarines Space Marine Chapter in 976.M41, but in 982.M41, it subsequently drifted out of Imperial-held space and disappeared. Its current location and activities are unknown.Hive Fleet Magalodon - Originally one of the splinter fleets that formed following the defeat of Hive Fleet Kraken in 992.M41, Magalodon has since grown exponentially to be classified by the Imperium as a distinctive hive fleet of its own, which continues to ravage Imperial space.Hive Fleet Jormungandr  - A small Tyranid hive fleet that entered the Imperium from the North East of the Ultima Segmentum in 993.M41, Jormungandr quickly gathered large quantities of biomass by preying on unprotected worlds. Within two standard years of the first recorded attack, Jormungadr had effectively sealed off the entire Thalassi Sector. The hive fleet's vanguard was wiped out by Commander Chenkov leading over a million Imperial Guardsmen of the Valhallan Ice Warriors' 18th "Tundra Wolves" Regiment. When a portion of the Crimson Castellans Chapter was corrupted by Chaos and turned Renegade, becoming a piratical warband of Chaos Space Marines, the Loyalist Castellans hunted down their corrupted brethren on the Hive World of Sephrax. But while they were engaged in battle, the Tyranid Hive Fleet Jormungandr unexpectedly descended upon the world and forced both sides to lay down their animosity to defend themselves against the swarms of bloodthirsty Tyranids that threatened to destroy the world and both groups of Astartes. However, the hive fleet's sheer numbers soon overwhelmed all the combatants. The Crimson Castellans' Chapter Master Sojai Antiro died in the bowels of the underhive of Hoventa Hive alongside his 1st Company Veterans, growling his defiance with his last breath even as Tyranid Raveners encircled him and tore him to bloody shreds. The Renegade Crimson Castellans' leader, the pirate and self-styled "Arch-Commodore" Bloodspite, fled with the remainder of his forces to the lair he had established in an asteroid in orbit of Sephrax. But the asteroid and its defenders were ultimately swallowed by a Hive Ship of truly enormous size. The Crimson Castellans' Chapter homeworld of Vorl Secundus was abandoned shortly thereafter, and it is unknown whether any elements of the Chapter, Loyalist or Renegade, have survived the fury of Jormungandr.Hive Fleet Medusa - This minor hive fleet invaded the galaxy from the galactic northeast through the region of the Ghoul Stars and close to the path of Hive Fleet Moloch in 997.M41. In 998.M41, Hive Fleet Medusa, mistakenly thought by the Imperium to be another tendril of Hive Fleet Leviathan, invaded the isolated Ice World of Shadrac. The Space Marines of the Space Wolves Chapter fought side-by-side with the battered survivors of the 10th Slovak Imperial Guard garrison, enacting a heavy toll in alien dead before they were forced to flee the planet.Hive Fleet Pythos - The Red Talons Chapter held the Fortress World of Orask on the edge of the Ghoul Stars from an invading splinter of Hive Fleet Pythos.Hive Fleet Moloch - Hive Fleet Moloch was a minor hive fleet that plunged through the Ghoul Stars into the galactic north of the known galaxy in 998.M41. A vanguard tendril first threatened the Agri-World of Jollov in 932.M41 just as Techno Magus Stannum Vir discovered fragments of a lost Standard Template Construct (STC) data core on the planet. The world's spaceport was defended by Imperial Guard regiments comprised of Agathon, Catachan Jungle Fighters, Kanak, Molov, and Mordian Iron Guard regiments, selling themselves dearly, which bought enough time for the Adeptus Mechanicus to flee with their precious STC discovery. Much later, the 9th Vostroyan Firstborn Regiment, "The Old Irascibles" met their ultimate fate during the Fall of Karak Prime in 998.M41 at the hand of Moloch. They held the main hive city for 18 solar months against the brutal onslaught of a splinter fleet of Hive Fleet Moloch, valiantly facing a Tyranid swarm that stretched from the base of the city's walls to the distant horizon. With the onset of midwinter, and with the rapid depletion of ammunition and supplies, the 9th Vostroyan knew that they were doomed and vowed to sell their lives dearly. Only when the bulk of the Tyranid swarm had passed into the city did the regiment detonate its nucleonic stack, incinerating the hive city, its defenders and an estimated 85% of the Tyranid swarm. With the coming of midwinter, the few surviving Tyranid organisms eventually starved to death and the splinter fleet was entirely defeated.Hive Fleet Ophidia - First encountered in 998.M41, Hive Fleet Ophidia has apparently been mostly destroyed, though splinter fleets and remnants still remain active in the southern regions of the Ultima Segmentum.Hive Fleet Hydra - This dormant hive fleet was recently discovered in 999.M41 by the Drukhari of the Poisoned Fang Kabal on the very extremes of the galaxy's eastern spiral arm. Instead of destroying the vulnerable hive fleet, the Drukhari boarded the largest Hive vessels, intent on bringing new specimens back to their Kabal's Haemonculi. However, the Drukhari were unprepared for the rate at which the bio-ships awoke from their aeons-long hibernation, and every Aeldari pirate that set foot inside one of the living ships was slain, butchered by a frenzied tide of Tyranids spawned to protect the living vessel. The remaining Drukhari fleet attempted to escape, but for every drone ship they destroyed, two more took its place. Prematurely awakened from its slumber, Hive Fleet Hydra accelerated its advance into the galaxy to slake its hunger.Hive Fleet Charybidis and Hive Fleet Scylla - Hive Fleets Chraybdis and Scylla are separate Hive Fleets that are both carving parallel paths through the Segmentum Pacificus, the closest known Tyranid threat to Terra. Additionally, unless the Saim-Hann Craftworld alters its course, it will fall into the clutches of the twin hive fleets.Hive Fleet Eumenides - Sometime during the late 41st Millennium, this Tyranid hive fleet battled against Hunter Cadres of the T'au Empire led by Commander Shadowsun. Then, in 990.M41, the planet Kitab in the Keplar System came under attack by a splinter of Hive Fleet Eumenides. The Raven's Watch Chapter was the first to respond to the distress calls, with the Stormtalon, the Talon of Johannes, the first craft to breach the planet's atmosphere. Having deployed the Ironclad Dreadnought Brother Crissica, the Stormtalon streaked across the desert sands towards the invasion fleet's primary synapse node. The craft's pilot was able to deploy Terminator Squad Foran and destroy the node before being forced to leave combat airspace by flocks of ravening Harpies and clusters of Mucolid Spores.Hive Fleet Chimera - One of many new hive fleets that currently assails the known galaxy. Like numerous other Tyranid fleets, Hive Fleet Chimera was first thought to be a splintered tendril of Hive Fleet Behemoth and not a separate hive fleet in its own right.Hive Fleet Grendel - One of many new hive fleets that have recently emerged from their cold sleep through the inter-galactic void, Hive Fleet Grendel currently assails the known galaxy.Hive Fleet Harbinger - The Harbinger is a recently discovered hive fleet that currently assaults the territory of the Imperium. A splinter fleet of Hive Fleet Harbinger recently consumed the Imperial Forge World of Arcetri.Hive Fleet Proteus - Hive Fleet Proteus is a Tyranid splinter fleet discovered in the Segmentum Tempestus by the Imperial Fists Chapter. Proteus was making its way down the galactic plane towards Terra by way of the Inwit Cluster.