The Tyranids, also known as the Great Devourer, earned their name after being first encountered by the Imperium of Man on the planet Tyran.
They are predators from beyond the galactic rim, the ultimate nemesis of all living things. They consume every scrap of biomass on any planet they find, leaving behind nothing but dead, airless husks.
The source of Hive Fleet Gorgon, currently surging toward Ke'lshan, can be traced back a century to the Battle of Macragge. After the Ultramarines Chapter and the Imperial Navy shattered Hive Fleet Behemoth at a staggering cost, numerous splinter fleets scattered into the void. The largest among them was Gorgon.
Perhaps sensing that the Imperium was a hornet's nest better left unpoked, this hive fleet crossed the vast interstellar gulf, veering away from Imperial space and heading straight for the Tau Empire.
Adam possessed specific intelligence regarding Hive Fleet Gorgon. During its war with the Tau, this hive fleet had demonstrated terrifying adaptability, with its bio-forms capable of rapid, reactive evolution. In battles against the Tau, they had even evolved carapaces immune to the ion weaponry commonly used by the Fire Caste, forcing the Tau to revert to relatively primitive projectile weapons to combat them.
In the original timeline, a Cadian expeditionary force—originally intended to reinforce the Damocles Crusade but delayed by a century due to a Warp-jump error—was supposed to arrive at the Ke'lshan Sept world and engage the Tau. However, through the mediation of the Water Caste and the realization of the Tyranid threat, the two disparate races were forced into an uneasy alliance, eventually displaying surprising synergy. Hive Fleet Gorgon, unable to adapt to two radically different combat styles and the "soul-stirring" combination attacks of the two races, was eventually broken and defeated.
But that was a statistical anomaly.
Currently, Adam saw no signs of Warp signatures, nor any trace of the 18th Cadian Regiment that was supposed to be here. This made things problematic. He frowned slightly.
His original plan was to use the Ethereal Council to mobilize the Tau, turning the Ke'lshan Sept world into a fortified killing zone. The planet would serve as a meat grinder to exhaust Gorgon's strength, allowing Adam to systematically hunt down the synapse creatures deployed to the surface. Once the hive fleet was depleted and overextended, the ship would strike from the void, initiating boarding actions and decapitation strikes against the vulnerable hive ships. It was a safe, reliable plan.
But the Tyranids, who were supposed to rely on Narvhal bio-ships manipulating the gravity of distant stars for FTL travel, had arrived far faster than anticipated. They were diving straight for the Ke'lshan Sept.
"Lord Adam , given the situation, how should we respond to this unexpected turn?" Belisarius Cawl looked up, a glint of calculation in his eyes.
Through the vox-casters of floating servo-skulls and his administrative access as one of the Morning Wood's designers, Cawl had also witnessed the incoming Tyranid tide. Factoring in the recently acquired Tau technology and running rapid simulations, the Archmagos stated: "In such a short timeframe, it is impossible for the Tau to construct a planetary-scale defense line capable of strangling a Hive Fleet. Unless, of course, you are willing to provide Necron Scarabs to assist them and mobilize the researchers from Prometheus Labs to oversee the construction."
"Don't panic."
After hearing Cawl's data analysis, Adam grew calmer instead. "This, too, is part of the plan."
He continued, "Since the Tyranids have arrived quickly, we will match their speed. Abandon the original planetary defense strategy. We concentrate all forces and strike first in space. Sometimes, going 'all-in' is a form of wisdom."
Adam gestured, and the wraith-like Sybilla immediately appeared at his side, awaiting orders.
"Take this down. I am making the following tactical adjustments: Notify Leonardo. He is to use the Eternity Gate to return to Terra and request Custodes reinforcements. Have him expand the detachment to five hundred Custodes, forming a temporary reinforced Shield Host. We need elite power for the coming battle."
"Furthermore, mobilize Prometheus Labs. Have them quickly gather mass-destruction weaponry from Mars—including but not limited to Deathstrike missiles, virus bombs, and vortex missiles—just in case."
"Inform our controlled Ethereal Council. They must immediately mobilize every military asset on Ke'lshan, including all Fire Caste members, to form a massive Hunter-Cadre. We will provide them with a sufficient quantity of elite battlesuits to ensure they are properly equipped."
After finishing his orders, Adam felt as though something was missing. "Repeat that back to me."
Once Inquisitor Sybilla finished her recitation, Adam nodded. "Good. Oh, and one more thing." He looked at the slightly bewildered Sybilla and smiled. "It's time to enhance your presence in realspace. The coming conflict will require significant psychic support."
Five days later.
Edge of the Ke'lshan System.
In the vast emptiness of space, a Castellan-class frigate glided silently, its aft plasma engines spitting hot exhaust. Escorting it was a Warden-class destroyer—a classic Tau scout flotilla.
In an effort to report the progress of the unknown alien invaders to the Sept world, the subverted Ethereal Council had ordered the Earth Caste to patch up what remained of the local fleet for this reconnaissance mission. The Air Caste crew, professionally trained and disciplined, did not underestimate the gravity of their task.
"O'shass, status? Any signal anomalies?" Inside the bridge of the Castellan frigate, the Air Caste commander stood at the center of the command hub. His limbs were so thin he resembled a dry branch. He stared intently at the comms screen.
"Reporting, Commander Farwind. No anomalies for the moment." On the accompanying destroyer, O'shass operated the long-range sensor array with practiced speed.
"Good. We proceed further. Stay alert," Farwind ordered.
The two ships waited in the silent void, but the ancient universe remained unchanged. There was nothing but drifting stardust and asteroid fragments. There seemed to be no life here, let alone the "Great Enemy of the Greater Good" described by the Ethereals.
Perhaps growing weary of the silence, O'shass opened an encrypted channel and whispered, "Commander Farwind, do you get the feeling that the Council's reaction this time is… strangely fast?"
"What do you mean?" Farwind countered. "Faced with an unknown threat, a rapid response is wisdom. I do not believe the Ethereals are in error."
"That's the thing," O'shass said. "The Council suddenly produced massive quantities of new battlesuit models, arming almost every Fire Caste veteran capable of piloting one. Then there are the 'Gue'vesa' reinforcements on Ke'lshan who claim to be from the Dal'yth Sept... It's as if the Ethereals knew exactly what was coming. They've mobilized the entire Sept's resources without hesitation, issuing high-priority orders that bypass all normal consultation protocols."
Farwind's hand paused. His voice turned stern. "And? Are you questioning the Ethereals? The guidance of the Greater Good is never wrong; their wisdom exceeds our understanding. I believe they foresaw this, which is why they treat it with such gravity."
"But—never mind. Apologies. I am not questioning them, I am just… uneasy. Everything is shrouded in mist, and except for the Ethereals, we don't even know what's inside the mist."
"It doesn't matter," Farwind said. "The answer will reveal itself soon. Based on gravitational anomalies, the contact window is estimated at—"
He stopped mid-sentence.
The sensor readings spiked. Dense static drowned out the clean interface. Massive interference even seemed to color the calm AI voice with a hint of urgency:
[WARNING: ALL PERSONNEL. ANOMALOUS GRAVITON READINGS DETECTED. MASSIVE GRAVITATIONAL FIELD DISTURBANCES DETECTED.]
What is that?
Despite being on separate ships, both O'shass and Farwind stared blankly out of their viewports. The space ahead, which should have been a deep black velvet punctuated by cold starlight, began to wrinkle like fabric. What started as ripples soon became a twisting vortex, stretching the background stars into grotesque streaks of light.
How many? Hundreds? Thousands? Tens of thousands?
On the holographic display, countless signals surged, the sheer volume and interference causing even the powerful AI processors to stutter. Finally, through the observation windows, every Air Caste member on board saw a sight capable of shattering the sanity of any rational being.
It wasn't a fleet. It was a tide. An abyss. A living nebula.
Tens of thousands of bio-ships, like a crawling belt of living asteroids spanning astronomical units, surged out of the torn warp-space. They varied in form, but all were covered in jagged chitinous carapaces and vascular clusters dripping with digestive fluids, their barbed tails thrashing in the vacuum. Smaller, cone-shaped bio-vessels swarmed around the behemoths like locusts, their numbers enough to blot out the stars.
Reflecting the faint light of distant suns, their carapaces shimmered with a greasy, wet biological luster, weaving together into a bizarre sea of color.
What terrified the Air Caste commander most was the movement of this living tide. They were not disorganized; they moved with a horrifying, singular intent. Every bio-ship seemed to follow a supreme command, pressing toward the Ke'lshan Sept with unstoppable momentum.
The two tiny Tau ships were like mantises trying to stop a carriage—utterly insignificant.
"Greater Good... what... is that...?" O'shass's voice was a choked rasp.
But Commander Farwind was strangely calm. "AI, calculate survival probability."
"Acknowledged, Commander," the neutral electronic voice replied. "Calculating... Calculation complete. Survival probability is zero. Current distance precludes escape from the alien species designated 'Gorgon'."
As expected. Farwind accepted the result. After all, both the Warden and Castellan classes were small vessels; their engines were not designed for long-range independent travel, often requiring gravity-hitches from Custodian carriers. To outrun an enemy with such efficient biomass-plasma propulsion? It was a naive hope.
Better to die with dignity.
"Activate the recorders. Broadcast at maximum priority to the Ethereal Council—no, to all Tau channels. Transmit all optical data." Farwind gave the order firmly. "Tell them the enemy has arrived."
"The Ethereals were right. Against such an existence, no amount of preparation is enough."
"Now, let us show them the courage of the Greater Good."
The two yellow-orange hulls, microscopic against the oncoming storm, surged forward. Guided missiles and heavy railguns fired in rapid succession into the approaching void. They reversed thrust as they fired, trying to buy even a single extra second.
It was futile.
The tide swept over them, and everything went dark. The two small ships vanished instantly into the rolling wave.
At that same moment.
Ke'lshan Sept World.
Everyone turned away from the horrific images, their faces pale with varying emotions.
Ethereal An'ze rose and looked around at the assembled leaders: Fire Caste commanders, the Custodes representing the "Gue'vesa Legion," Earth Caste and Water Caste delegates. He looked up at the center of the hall, where several drones hovered, their sensor lenses glowing with a cold light.
An'ze knew that at this moment, every Tau on Ke'lshan was watching him. They felt fear, grief, anger, and shock. They were waiting.
Fortunately, whether as a believer in the Emperor or as an Ethereal, his interests were perfectly aligned.
He cleared his throat and announced solemnly: "Everyone, the war has begun."