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Targetdrone.gif This article is about the Hive fleet; for the other uses, see Leviathan (disambiguation).
Leviathan's path into the galaxy from the galactic south. Other Hive Fleets are also shown[15]

Hive Fleet Leviathan is the largest and greatest Tyranid Hive Fleet to invade the Galaxy. It attacked in 997.M41 from the galactic south. Unlike the majority of previous Hive Fleets that attacked from the Eastern Fringe, Leviathan instead skirted under the galactic rim of the galaxy and then pushed upwards through the galactic plane, spreading its forces across a broad front that covered the Ultima Segmentum, Segmentum Tempestus and even into the Segmentum Solar. Leviathan's strategy was to form its forces into two giant tendrils hundreds of light years apart in such a way that it stretched the Shadow in the Warp over the vast distance between the two tendrils, stopping all psychic contact between the trapped worlds and the Imperium and also blocking Imperial reinforcements from navigating the Warp towards the beleaguered worlds.[1d][2]

One of Leviathan's main tendrils, which was on a projected course directly to Terra, was eventually stopped at Tarsis Ultra. However, Leviathan as a whole remained undefeated and continued to assault the galaxy. Leviathan consumed countless worlds. In response, the Imperium is reinforcing entire Systems, raising thousands of armies and dispatching dozens of Space Marine Chapters to troubled areas; meanwhile, several Craftworlds of Eldar used ancient destructive weaponry to reduce planets to Dead Worlds, and the Tau developed new technologies and weaponry to combat the Tyranids.[1d][2][4]

Thanks to the formation of the Great Rift, much of Leviathan was cutoff as it made its main assault on Baal, homeworld of the Blood Angels. Most of Leviathan was destroyed during the period known as the Blackness against the defenders of Baal, the Indomitus Crusade, and newly materialized Daemonic armies.[15]

In M42 Leviathan shocked the Imperium by launching a massive new offensive consisting of several new tendrils into Segmentum Pacificus, threatening Segmentum Solar itself.[24a]


Hive Fleet Leviathan attacked below the Galactic Plane, causing shock throughout the Imperium[1d]

In late 997.M41 the Imperium first lost contact with several systems in the Segmentum Tempestus. Inquisitor Kryptman implemented a great astrotelepathic augury, which became known as the Kryptman Census, and eventually made contact with every documented planet on the southern fringe of the Imperium. The worlds that ceased to respond began to form a pattern, and Kryptman identified it as the approach of a hive fleet of terrifying size.[2]

Leviathan's principle attack formed two tendrils hundreds of light years apart. The Imperium lost contact with the worlds trapped between these two "jaws", and if these jaws closed they would devour all trapped inside.[2]

Tarsis Ultra

The planet of Tarsis Ultra stood directly in the path of one of Leviathan's main tendrils, the tendril on a course towards Terra. Tarsis Ultra was defended by the Ultramarines led by Captain Uriel Ventris, along with the aid the Mortifactors led by Chaplain Astador, and supported by the 10th Logres led by Colonel Octavius Rebalaq, the 933rd Death Korps of Krieg led by Colonel Trymon Stagler, and PDF Regiments headed by Major Satria. Inquisitor Kryptman was also present to impart his extensive knowledge of the Tyranid threat. When the Tyranids arrived in the system, in 999.M41 or in 509997.M41[6b] depending on the source, and consumed the planet Barbarus Prime, the Imperials launched an attack in space. Despite an initial victory in destroying a Hiveship, Kryptman wished to invoke Exterminatus upon the world Chordelis, as it was the next planet in the path of the Tyranids. Ventris was vehemently against this and supported an alternative solution to slow down the Tyranids by exploding a hydrogen-plasma refinery in space thereby destroying another Hiveship. However, Kryptman lied to Ventris and with the assistance of the Mortifactors invoked Exterminatus in spite of the Ultramarines' plan succeeding. The Imperials attempted the same space refinery trick again to destroy yet another Hiveship, but the Tyranids adapted to this ploy and the plan backfired on the Imperials, crippling their fleet and forcing the survivors to flee; Tarsis Ultra was left unprotected from space, allowing the Tyranids to launch their final planetary invasion.[2][9][10]

Tarsis Ultra was besieged for several weeks, only just managing to hold out under the command of Uriel Ventris and later Kryptman. The tides eventually turned in Imperial favour when Ventris and a Deathwatch Kill-team captured a Lictor from the original wave of the invasion. Magos Biologis Vianco Locard reverse engineered the Lictor's genetic code to design a biological plague that would send an early generation Tyranid into hyper-evolution and thus kill the creature. If delivered to the heart of the swarm it could destroy the entire tendril. Ventris then joined the Deathwatch team in infiltrating the final remaining Hiveship and delivered the plague to the Norn-Queen. Slowly at first, but with gathering speed, the Tyranids turned upon and attacked each other. Their synaptic control had been lost. At this point, the remaining Space Marine contingent of both the Ultramarines and Mortifactors were down to sixteen men. The majority of the remaining Tyranids froze to death under the harsh conditions of Tarsis Ultra with a minority surviving and taking refuge in warmer surroundings. The Imperial forces launched a counter-offensive which destroyed the swarm and stopped the invasion. Leviathan's tendril, on a course to Terra, was dissipated and the once-doomed worlds caught in between Leviathan's two main tendrils began to register on Imperial augurs again.[2][9][10]

A Tyranid Warrior of Hive Fleet Leviathan[16]

Galactic Cordon

The rest of Leviathan continued to rampage further into the galaxy and so Kryptman ordered a galactic cordon be established to slow the Tyranids' advance and buy time for Battlefleet Solar and Battlefleet Tempestus to muster. The cordon forced a band of worlds in Leviathan's path to be evacuated and many of them to be razed to the ground to deny Leviathan any bio-resources. Worlds already under invasion were destroyed with Exterminatus just as the Tyranids descended to feed upon the doomed planet, making them expend bio-resources to claim a world only to lose everything upon it. Kryptman's cordon condemned billions of Imperial citizens to death - the single largest act of genocide upon the Imperium since the Horus Heresy. His actions were met with outrage by many influential Inquisitors. He was labeled a radical, a traitor, a fool and the Inquisition ultimately issued a Carta Extremis that stripped him of his title and reduced him to a criminal. But his cordon did succeed in slowing Leviathan's advance to a crawl.[2]

Octarius War

Main article: Octarius War

Kryptman, despite being cast out of the Inquisition, decided to harness the Tyranid swarm and turn it against the galaxy's other enemies. He planned to use a tendril of Leviathan to eliminate the Ork Empire of Octarius, as the Imperium was stuck in an ever-escalating war against Octarius that the Orks were dominating. Kryptman led several specially equipped Deathwatch teams into the caverns of Carpathia to attempt to capture a brood of live Genestealers in a stasis field. The mission was successful, although Kryptman's force suffered heavy casualties. He then planted the brood on board the Perdition's Flame, a Space Hulk that emerged from the warp in the path of Leviathan. As the Genestealers awoke, he destroyed the moon of Gheist in order to divert the hulk's trajectory directly towards the Octarius Empire. Despite the Ork's efforts to quash the Genestealer infestation, a tendril of Leviathan changed course towards the psychic signal of the Genestealers and invaded the Empire. Within weeks, a dozen worlds in the Octarius Empire became infected.[1d][8] Depending on the source, the date of Leviathan's invasion is either 989.M41 [8] or 999.M41 [4].

Leviathan was nearly stopped by the Orks at Ghorala. When Leviathan's fleet arrived they were countered by every Ork vessel within a dozen light years, as well as extensive mine fields hidden amongst Ghorala's asteroid belt which tore Bio-ships apart in cataclysmic explosions. Ork gunships assaulted the surviving vessels before they had time to react and the Tyranid fleet was all but destroyed. However a single bio-ship managed to break through the Ork blockade and hurl itself at Ghorala, heedless of pain or injury. It launched thousands of Mycetic Spores onto the planet's equatorial planes. On the planet's surface, the small Tyranid swarm cunningly adapted its tactics in order to slowly but surely gather more bio-resources and increase their numbers. When Skarfang, the Ork's leader, was killed by Lictors, the Orks on Ghorala collapsed into infighting and became easy prey for the Tyranids. Each tribe was isolated and destroyed in quick succession until, within weeks, all the Orks on Ghorala had been killed. The bio-resources of the planet were turned into new bio-ships and the Tyranid infestation quickly grew again and spread to nearby Ork worlds. The war eventually spread to Octarius, the central world of the Empire. Never before had Octarius seen such bloodshed, and the war soon spread from the planet out to the entirety of the Octarius Sector. Other Ork worlds lost to the Tyranids include Orrok, Derragon and Keltor.[1d][5]

The Octarius war contines to escalate. Recent reports indicate that the Tyranid Swarmlord has joined the assault on the Orks of Octarius. Kryptman's plan to have both xenos species destroy each other at first appeared to be successful. However, his plan backfired. Orks from lightyears around are flocking to Octarius, and are growing bigger and stronger on their diet of conflict. And every Ork devoured gives more biomass to the growing Tyranid swarm, which is constantly learning and adapting new ways to defeat their foes. Kryptman started a series of events that is making both sides stronger. Whichever race wins the war will emerge stronger than before.[1d][2]

Devastation of Baal

Leviathan continued its assault on the galaxy. Two dozen Space Marine Chapters were known to be involved in containment operations, with Captain Aajz Solari of the Raven Guard in overall command.[6a] As of 997.M41 Imperial Guard Army Group Twelve, comprised mainly of Catachan and Jornian forces, continued to hold out against a tendril as reinforcements were being raised.[7] In 999.M41 a tendril of Leviathan was identified to be on a direct course to the Blood Angels' Homeworld of Baal.[5]

Despite a delaying action in the Cryptus Campaign, Baal eventually came under Tyranid invasion. The Tyranids were on the verge of victory until the Great Rift formed as a result of the Thirteenth Black Crusade and its aftermath. The sudden Warp Storms cutoff most of Leviathan inside the Baal System, while great Daemonic hosts surged into the Materium. Nonetheless, the Tyranids were on the verge of victory on Baal until the arrival of the Indomitus Crusade led by Roboute Guilliman itself. After many battles, the devastated world of Baal and its two moons were won. What became of much of Leviathan remains mostly a mystery, swept up in the period of chaos known as The Blackness. What is gathered however is that newly formed Daemonic forces moved against the xenos. On Baal's moon of Baal Prime the symbol of the Bloodthirster Ka'Bandha was formed from the skulls of many fallen Tyranids.[15]

In the wake of its defeat at Baal, Leviathan's remains have launched a vast offensive along the southern border of the Segmentum Solar. The Tyranid assault now reaches as far into the galactic core as Bloodfall, home world of the Red Wolves. Recently reinforced with Primaris Space Marines, the Red Wolves proved stubborn and deadly foes, until Leviathan unleashed its most fearsome weapons: broods of monstrous bio-titans, spawned in the brutal furnace of the Octarian War and glutted upon potent greenskin biomass. Diverted from the ongoing war with the Orks, these monsters are formidable siege organisms. With colossal, hooked fore-limbs they smashed great rents in the Red Wolves' fortifications, and swarms of Genestealers flocked into the breaches. Their fortress monastery hopelessly compromised, their losses horrific, the Red Wolves were forced to retreat, securing vital stocks of gene-seed and evacuating upon their remaining Battle Barges.[16]

The Blood Angels and their successors continue to be plagued with Leviathan, as seen with the Angel's Halo campaign.[18]

Faced with the ever-evolving remnants of Leviathan, Lord Commander Roboute Guilliman has reinforced Segmentum Solar and has dispatched several Primaris Space Marine Chapters to the frontlines of the Tyrannic Wars.[16]

Fourth Tyrannic War

Ultramarines Terminators battle Tyranids during the Fourth Tyrannic War[22]

The Fourth Tyrannic War began in M42, when the largest invasion of Leviathan yet when it attacked the Western Reaches of Segmentum Pacificus.[21] The assault began with the coordinated attack from above and below the galactic plain by two new tendrils dubbed Nautilon and Promethor respectively. The two tendrils are moving in parallel towards Segmentum Solar, and with the Imperium distracted by the Indomitus Crusade few forces initially stood against it.[24a]


The first indication of the Tyranid thread was silence across much of Segmentum Pacificus as the Shadow in the Warp descended. The loss of communication with many outlying Systems initially went unnoticed several Sector commands due to the typically slow wheels of Imperial bureaucracy, the presence of Warp Storms, as well as simultaneous Ork and Knydd threats. The scale of the threat was finally discovered in the Morpheum Sector command thanks to the horrific death of High Astropath Guideoth. Consumed by the Shadow in the Warp, the Astropath was transformed into a tendrilled monstrosity that wrought destruction across the Astropathic Choir before finally being put down. Simultaneously, reports finally began reaching Imperial authorities of a Tyranid attack of unprecedented scale. The Byroth Sub-sector was consumed by Tyranids as its Imperial Guard forces battled Orks. At the Trinary Reach Cluster, a Leagues of Votann fleet suddenly retreated as the Imperial defenders of several factory worlds rejoiced, only for the Tyranids to descend in their wake. Vast refugee fleets began arriving in the Haratus Stars, the Mytolian Belt, Templum II, and Gethsemanax. Despite security precautions and quarantines, Tyranid xenoforms and spores still got through and caused bloody uprisings in the aftermath.[24a]

Gradually, Imperial commanders were able to put together a horrifying picture. Two new tendrils of Hive Fleet Leviathan of unprecedented size had invaded Imperial space in a coordinated effort. One, dubbed Nautilon, was moving into the Vynor Sector from above the galactic plane while the other, dubbed Promethor, was moving into the Morpheum Sector from below it. Worse still, these two tendrils were coordinating with one another in a roughly paralleled eastern advance. If was a route that, if unaltered, would take them into Segmentum Solar and towards Holy Terra itself. The Imperial response to this horror was typically inconsistent, with some Governors oversee total mobilization to conduct a defense while others simply led a mass abandonment. Some Space Marine and Imperial Navy elements sought to wage whatever defense they could while other Astra Militarum armies began to attempt to create defensive lines to stem the Xenos advance.[24a]

Imperial Response

Soon enough, the Eyes of the Emperor of the Adeptus Custodes learned of the Tyranid threat and the danger it posed to Terra. The Frigate Pinion docked at Terra shortly after, bringing word of the threat to Captain-General Trajann Valoris himself. Valoris subsequently met with the rest of the High Lords of Terra. With the forces of the Imperium mostly committed to the Indomitus Crusade, many feared that Segmentum Solar was now defenseless to face the incoming threat. However Valoris and Lord Commander Solar Arcadian Leontus oversaw a massive mobilization effort to ensure that the Tyranid would be blunted. A policy of "aggressive defense" was formulated by the garrisons of the Imperial Guard while rapid-response strike forces known as Solblades were established for more elite forces. These Solblades would consist of a mix of Space Marines, Sisters of Battles, Militarum Tempestus, Knights, Mechanicum, Inquisition, and even Custodes and were given a wide range of strategic autonomy. It was hoped that while they were low in manpower, their highly mobile and autonomous nature could disrupt the Tyranid advance. By the time the first Solblades appeared, over half-a-dozen Sectors in Pacificus had been consumed by the Tyranids, but proved highly capable in disrupting the Xenos' progress in local counterattacks.[24a]

As the Solblades bought time, Valoris and Leontus oversaw the establishment of a defensive line to protect Segmentum Solar dubbed the Sanctus Line. This was based around key "Anchor Worlds", each of which lay on a major warp transit route. While the Tyranids did not use Warp travel, these worlds were still of vital importance logistically to the Imperium and it was hoped that using them as the lynchpin in the defensive network would allow for a unified and coordinated front against the incoming Tyranids. Each Anchor World was given a Sub-Sectors worth of resources, and in addition to their defensive role they also provided bases for Solblades to operate from.[24a]

Deploying into the paths of the tendrils of Promethor and Nautilon, the Solblades found themselves facing massive concentrations of Tyranids across a large multi-system front. The tendrils did not move swiftly however, and each comprised scores of smaller splinter fleets that broke away and sought out new prey. Sometimes, they would even double back to strike at enclaves of Human or other alien life. The Tyranids were taking their time, and this was something the Imperium sought to exploit. using their speed to their advantage, the Solblades emerged victorious in countless tactical engagements, though their own losses were also terrible. Gradually, under constant Imperial and other alien attack, the advances of Nautilon and Promethor stalled and began to fragment. Hope would prove to be short-lived, however.[24a]


Imperial Guard battle the forces of Grendyllus[24b]

While the Solblades eventually proved successful in slowing Nautilon and Promethor's advance, the Hive Mind countered this by launching its third tendril dubbed Grendyllus up through the galactic plane and then attacking well behind the lines of the Solblades' advance. This allowed it to rampage through several sectors and Leagues of Votann territory before it invaded the Bastior Sub-sector. It was only when Groupmaster Tysen Yacobe's Battle Group Faustus encountered the tendril, that the Sub-sector became aware of the true extant of the invasion.[24a]

At that time, Lord Commander Solar Leontus was located in the Sub-sector, as he had made the Anchor World Sanctum his base of operations. When he realized the full scale of the invasion, Leontus knew Bastior's Imperial forces were not enough to defend it. The Lord Commander Solar would then send out a plea for aid to the Solblades and any other Imperial forces outside the Sub-sector that could help. Afterwards, Leontus ordered Bastior's Imperial forces to retreat from their current positions and reinforce either the Formidyre, Pyremoat or Kastayl Systems, which were named as Sanctuary Systems. However this would not be possible for all of the Imperial forces, as they were already engaged with fighting Hive Fleet Grendyllus or were unable to reach the Sanctuary Systems. Others, like Groupmaster Yacobe, meanwhile refused to retreat and either struck at the Hive Fleet whenever possible, or defended the worlds and Systems they were located in when the invasion began. Some Imperials even attempted to flee from the Sub-sector, but only a few were successful[24a]. Species like the Leagues of Votann, Orks, Asuryani, Drukhari, Necrons, Hrud, Ghluthykk and Mebrii, also either fought or fled from Grendyllus. Soon the entire Sub-sector was invaded and several of Bastior's systems fell to the Hive Fleet. Sanctum itself seemed to be targeted by Grendyllus and some Imperials in the Sub-sector speculated this was because the Hive Fleet knew of the Anchor World's importance.[24b]

However before the Bastior Sub-sector was completely lost, the Solblade fleets arrived and began to turn the tide against Grendyllus. Among them were commanders like the Ultramarines First Captain Severus Agemman and the Adeptus Custodes Captain-General Trajann Valoris, who aided in saving the life of Lord Commander Solar Leontus on Sanctum. Other Imperial forces also arrived to aid Bastior and together these reinforcements have kept the Hive Fleet from consuming the Sub-sector. The Imperium now fears, though, that with the Solblades fighting Grendyllus, the tendrils Nautilon and Promethor will be able to continue their advance upon Segmentum Solar.[24c]

Known Campaigns of the Fourth Tyrannic War

Other Conflicts

  • The Bio-Purge: Encouraged by their success against the Tyranids at the Battle of Duriel, the Eldar of Iyanden and Biel-tan bring the Fireheart to other worlds that lay in the path of the Tyranids. However their campaign of genocide to starve Leviathan brings Imperial retaliation, and forty Space Marine Chapters are mobilized to converge on the war zone. However some become embroiled with nearby Orks, who themselves have been displaced by the Eldar's purges. However the Invaders and Crimson Castellans assail Iyanden's forces as they move to destroy the Agri-worlds of the Verdox System. As the vanguard of Hive Fleet Leviathan descends upon Verdox II, Autarch Sunspear and his army of Ghost Warriors are caught between the vengeful Space Marines and the Tyranid swarm. Despite the odds, Sunspear's command ability pays off and the Eldar manage to draw the Space Marines into a fight with the Tyranids.[12]
  • Tesla Prime — A major Adeptus Mechanicus weapons testing facility. It was in Kryptman's cordon and was evacuated. While the Mechanicum attempted to remove as much material as possible some equipment proved too large, or too dangerous to move and so was abandoned. Shortly after the last ship departed Tesla Prime Ork looters proceeded to raid whatever had been left. The explosions from their 'experiments' could easily be seen from space. When Leviathan arrived the Orks had managed to master many of their new toys resulting in massive casualties on both sides and causing the conflict to spread to many nearby worlds. The resulting war proved to be extremely helpful to the Imperium allowing them to fortify or reclaim many smaller strongholds against further incursions. Kryptman, at this point no longer part of the Inquisition, monitored the events on the planet through the troubled dreams of Astropaths still loyal to him. The discovery that both xenos species were exacting huge losses upon each other led to his discussion to start the Octarius War.[1d][2]
  • The Battle for Kalevala — The home to the Gene-seed of the Steel Confessors comes under assault.[17]
  • Rigant — A once-peaceful planet of golden plains and little else. The war from Tesla Prime spread to the planet.[2]
  • Gryphonne IV — A Forge World located within Kryptman's cordon but the Adeptus Mechanicus refused to abandon their planet, one of the principle forge worlds in the galaxy, to Exterminatus. Alone in an abandoned system, they prepared for war. The planet was the home of the Legio Gryphonicus, fearsomely disciplined Skitarii legions, and could boast to have the finest defences of any world in the galactic south of the galaxy. However, within days, the planet was overrun by Leviathan; its Skitarii overwhelmed by hordes of Gaunts and the Legio Gryphonicus torn asunder by Tyrannofexes and Hierophants.[2]
  • Gorgo — In 996.M41 a tendril of Leviathan, designated 'Gorgo's Talon', invaded the planet of Gorgo. Despite the Cadian 23rd Lucky Dogs garrisoned on the planet, it fell to the Tyranids within a single week. Captain Sicarius arrived at Gorgo just as every living thing was being rendered down to bio-resources. He launched a devastating counter-invasion using the Spear of Sicarius formation to strike hard at the swarm's Synapse creatures.[4]
  • Sondheim V — Leviathan descended upon Sondheim V just after M'kar the Reborn had transformed it into his private pandemonium. Carnifexes battled Bloodthirsters in the streets whilst Zoanthropes conducted psychic duels with Lords of Change. The Sky Sentinels Chapter were dispatched to reclaim Sondheim V for the Imperium. But upon seeing the situation they opted to call in Exterminatus instead.[1d]
  • Fall of Shadowbrink — Leviathan battles both Imperial and Daemonic forces on Shadowbrink.
  • Forgefane- Leviathan assaults this supposedly impregnable stronghold of the Iron Warriors and consumes the planet in less then a week.[1a]
  • St Caspalen — A Missionary World that could put up little defence against Leviathan as its Planetary Defence Force was rendered ineffective by the insidious actions of Deathleaper, a unique Lictor created by Leviathan as the ultimate weapon of terror.[1b]
  • Stormvald — A Tyranid swarm was singlehandedly defeated by the Eldar Phoenix Lord Maugan-Ra.[1d]
  • Forgefane — A supposedly impenetrable Iron Warriors Fortress World which fell to Leviathan after Trygons tunneled under the fortresses.[3]
  • Lucius — The key Adeptus Mechanicus Forge World is invaded, but the Mechanicum forces are victorious after months of fighting.
  • Ulik Sector — Space Marines from the Death Strike and Genesis Chapters undertook a series of Exterminatus missions on worlds in the Ulik Sector before Leviathan had a chance to consume them.[1d]
  • Battle of Bloodstar — Admiral Trankar of the Ultima Fleet ends his disastrous campaign against Leviathan by allowing his fleet to be ambushed by two separate tendrils.[1d]
  • PhodiamKnight World that found itself invaded.
  • Defence of ValedorValedor was populated largely by pilgrims and monks. It was overrun in a matter of hours.[2] There was also overwhelmed a battle barge of the Iron Lords Chapter[14] Later, Eldar forces from Biel-Tan and Iyanden unite and unleash a psychic doomsday device to destroy the planet and prevent fragments of Hive Fleet Kraken from being absorbed by Leviathan. The Eldar repeat this plan on dozens of Imperial and Ork-held worlds.[13]
  • St Capilene — An Ecclesiarchy controlled world that held out for weeks under the Sisters of Battle. The world fell a handful of days before the Tyranids were driven from Tarsis Ultra.[2]
  • War of Foretelling — The Vonst system is lost in less than a month.
  • Battle for Miral II with the Imperial Fists Chapter. Tyranids were forced to retreat.
  • The Destruction of the Emberg-Aegnir Bloc of the Leagues of Votann.[20]

Color Scheme

The creatures of Leviathan display a recognizable coloring of white skin with purple carapaces, and usually red weapon symbiotes.[1c]

Tyranids from Leviathan's newer offensive into Segmentum Pacificus seem to have a slightly different color scheme consisting of a more purplish hew over their white skin and a different shade of purple for their armored segments.[22]

Splinter Fleets

Known Splinter Fleets of Hive Fleet Leviathan include:


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