Three days later.
Abaddon the Despoiler stood upon the command bridge of the Vengeful Spirit, the talons of his ancient gauntlet resting against an obsidian rail polished by generations of slaves. Beyond the armored viewport, Cadia hung against the void: a scarred sphere veiled by fire, debris, and the failing glow of its defensive network.
The strategium behind him had fallen silent. Black Legion officers, bound daemonhosts, mortal fleetmasters, and the representatives of allied warbands waited beneath banks of dim red lumen-globes. Some had come in person. Others watched through flickering hololithic projections or spoke through possessed vox-relays whose brass mouths whispered even when no signal passed through them.
At the system's outer reaches, a single warp rift still disturbed local space. Purple-red light crawled around its ragged circumference, and the stars beyond it wavered behind layers of auspex distortion. Every allied fleet had entered the Cadian System through it, following the road opened by the Black Legion's ritual.
Typhus had arrived aboard the ancient Terminus Est at the head of his Plague Fleet. The Red Corsairs had answered Huron Blackheart's command with a powerful raiding force. Kossolax the Foresworn had arrived aboard the Conqueror, Angron's old flagship and now the heart of his surviving host.
Together, the assembled armada counted nine battleships and more than two hundred other warships. Battle barges scarred by ten thousand years of war held formation beside plague cruisers leaking contaminated vapor. Raider squadrons prowled between lumbering carriers. Dark Mechanicum vessels dragged chains of servitor-controlled escorts behind hulls rebuilt so often that no original silhouette remained.
Above them all waited two Blackstone Fortresses.
Each ancient construct spread eight immense arms around a central core, its surface interrupted by weapon apertures, docking cavities, and armored structures added by successive occupiers. One remained under Abaddon's authority. The other had been gifted to Huron Blackheart to secure the Red Corsairs' support and had now returned beneath pirate colors. Together, the two fortresses possessed enough firepower to decide the war before another soldier reached Cadia's surface.
Chaos squadrons were already reducing the rest of the system. Orbital stations burned. Moon-based batteries had been silenced or isolated. Forge platforms and listening posts broke apart under lance fire while attack craft hunted surviving Cadian vessels through the debris fields.
Preliminary discharges from the Blackstone Fortresses had overloaded the void shields protecting the principal Cadian bastions. Individual generators still flickered across the surface, and scattered defense batteries continued firing, but the coordinated planetary shield network had failed. Cadia had survived the Volscani betrayal only to find the Black Legion waiting above it.
Once the two Blackstones completed a coupled firing cycle, their warp-cannons would have an unobstructed path to the planet. One focused discharge would be sufficient to burn through the remaining defenses and break the fortress world beyond recovery.
Victory appeared certain.
That certainty created its own problem. Every warlord who had joined the campaign now wanted payment, territory, captives, or future assistance. Abaddon had spent centuries binding traitors, pirates, zealots, and daemons into weapons that could be aimed in approximately the same direction. He knew that an alliance of Chaos was most dangerous in the moment after success, when every participant began calculating how much of the victory belonged to him.
Kossolax spoke first.
The Foresworn warlord towered within battered crimson armor whose plates had been cut, repaired, and cut again across millennia of violence. The Butcher's Nails beneath his skull produced a faint mechanical ticking whenever he held himself still. His restraint was not calm. It was rage compressed until it could be used.
"When Cadia falls, you will aid my return to Agripinaa," Kossolax said. His voice emerged from his helm as a metallic growl. "My surviving warbands still raid the forge world's surface. I will not abandon them, and I will not leave that system in the hands of Talon."
The demand carried no title, courtesy, or acknowledgment of rank.
Abaddon regarded him without moving. Kossolax had brought only the Conqueror. No supporting flotilla. No massed Foresworn assault force. His other warriors were either trapped around Agripinaa, scattered after their earlier defeat, or too consumed by private slaughter to answer him. Whatever the reason, arriving with a single flagship was a poor tribute to a crusade of this scale.
Now he expected the Black Legion to repair the consequences of his failure.
"Your surviving warriors will not be left to die for nothing," Abaddon replied. His tone gave away neither irritation nor amusement. "When Cadia is finished, I will commit forces to Agripinaa."
Kossolax stared at him for several seconds. The Nails demanded challenge, blood, and the immediate destruction of anything that sounded even faintly condescending. Experience forced those urges back into their cage. He gave one short nod, accepting the promise without pretending gratitude.
Abaddon then turned toward Typhus.
The Herald of Nurgle stood within swollen Cataphractii plate whose corroded surfaces shifted around the diseased bulk inside them. Tubes pulsed with discolored fluid. Rusted vents breathed damp heat into the strategium. Clouds of flies moved around him in slow spirals, disappearing into gaps in his armor before crawling out through wounds that never closed.
The bridge crew kept their distance. Even the mortal slaves knew that the insects around Typhus carried deaths for which Imperial medicae had never found names.
"Once the Cadian Gate is broken, my Plague Fleet sails for the Ultima Segmentum," Typhus said. His voice bubbled through the helm's vox-grille, wet and deep. "Your ships will support that campaign."
It was not framed as a request. Typhus did not bargain like a pirate or posture like Kossolax. He spoke with the certainty of a man who believed decay itself had already approved his plans.
"They will," Abaddon answered.
The eastern campaign would spread disorder across territories the Imperium depended upon for manpower, industry, and stable routes between worlds. Whether Typhus conquered those worlds or merely drowned them in disease mattered little to Abaddon. Either result would weaken resistance elsewhere.
Last came the Red Corsairs' representative. Huron had not attended in person. Instead, he had sent a former captain of the Astral Claws, a hard-faced renegade whose armor retained only the faintest scars where Imperial heraldry had once been removed. Unlike Kossolax, he showed neither open rage nor impatience. He watched the bridge with the measured interest of a pirate estimating which fixtures could be stolen without collapsing the ship.
"The Lord of Badab requires your aid in capturing Talon Navy vessels," the captain said. "Intact vessels. Their engines and weapons are worth more than drifting wreckage."
That request suited Abaddon better than the others.
The Red Corsairs had committed a substantial fleet and risked the Blackstone Fortress entrusted to them. More importantly, their interest in Talon coincided with his own. The Cadian campaign was not the end of his obligations. Once the fortress world fell, the Black Legion would move toward galactic north and begin the next stage of the war. The Talon Sector lay along that path, and its growing military strength had become too dangerous to ignore.
If Huron's reavers wished to board Talon ships, dissect their technology, and drag the surviving hulls back to the Maelstrom, Abaddon was willing to provide the opportunity.
"The Black Legion will help you take them," he said. "If their crews refuse surrender, cripple their propulsion and kill everyone who cannot operate the machinery."
The Corsair captain inclined his head. "A practical arrangement."
Abaddon allowed the silence to stretch before addressing all three warlords.
"I will honor these agreements," he said. His voice carried across the strategium without assistance, yet every vox-receiver on the bridge repeated it a fraction of a second later. "But understand why."
Kossolax's posture tightened. Typhus remained motionless. The Red Corsair watched with narrowed eyes.
"My ritual opened the road into this system. It did not summon your fleets. No herald of mine ordered you here. No chain of obligation compelled you to cross that rift after the work was already complete."
The destinction mattered. If the allied fleets claimed they had answered Abaddon's call, every future demand could be framed as payment owed for Cadia. If they admitted they had come willingly, their rewards remained favors granted by the Warmaster rather than debts extracted from him.
Kossolax understood immediately.
The Nails drove a fresh spike of pain through his skull. His gauntlet curled around the haft of his chainaxe, and for one violent instant he considered crossing the strategium and testing whether Abaddon's title would survive the loss of its bearer.
Then he counted what stood between them: the Talon of Horus, Drach'nyen at Abaddon's side, the Black Legion honor guard waiting without visible tension, and the defensive systems built into the Vengeful Spirit itself.
Kossolax could attack. He could not be certain he would win. Even the Nails could not erase the difference.
"You came because you understood what Cadia's fall would make possible," Abaddon continued. "Your ambitions do not offend me. They prove that you can still recognize opportunity. There will be other wars, other worlds, and more than enough enemies for every promise made here to be fulfilled."
He turned back toward the viewport.
"For now, watch. Cadia has reached its final hour."
The Blackstone Fortresses began their last firing cycle.
Sickly light moved inward along their eight radial arms. Deep within each construct, systems older than the Imperium directed warp energy through internal prisms and focusing chambers toward the central weapon apertures. The two fortresses synchronized gradually, correcting their alignment by fractions as their firing solutions converged upon Cadia.
The surviving Cadian shields flickered in response. On the planet's night side, isolated domes of pale light appeared over fortress complexes and vanished again as generators failed under the strain. Orbital auspex stations screamed warnings into a command network already choked with casualty reports.
Near the system's safe translation limit, the ritual rift remained open along the Mandeville boundary. Its stable resonance fed the Blackstones more energy than their corrupted systems could accumulate unaided.
Readings climbed across the Vengeful Spirit's tactical displays. Mortal officers called out power thresholds. Possessed cogitators laughed through their speaker-grilles as numbers turned from amber to red.
"Firing threshold reached," Abaddon said quietly.
He could already see the next moments: the linked beams crossing the void, the last Cadian shields collapsing, the planet's crust breaking beneath forces no conventional fortress could withstand. The Cadian Gate would fall. The Imperium's armies would watch their proudest fortress world die, and the Eye of Terror would no longer be contained behind its old barriers.
The shot never came.
The energy gathered within both Blackstones faltered. Instead of converging upon their weapon apertures, the charge bled outward through every exposed conduit and vanished into the surrounding void. Arcs of warp-light snapped between the fortresses' arms, weakened, and dispersed.
Warning runes flooded the strategium.
Across the system, the ritual rift began to contract. Its luminous edge folded inward as if compressed by an external field. Warp turbulence declined so abruptly that Navigators aboard the Chaos fleet cried out, blinded not by excess sensation but by its sudden absence. Daemonic faces molded into bulkheads froze. Possessed machinery fell silent or began clawing uselessly at its own housings.
The pressure reached the bridge of the Vengeful Spirit.
Typhus looked down at his armored hands. The flies around him had lost their ordered motion. Some dropped onto the deck and twitched weakly. Others crawled into the vents of his armor as though seeking shelter. The endless presence behind his thoughts, the distant warmth of Nurgle's garden, the patient approval that accompanied every infection, had become muffled.
The strength had not left his body, but he could suddenly feel its boundaries. The weight of his armor. The ancient damage beneath his flesh. The effort required to draw breath through lungs that had not functioned like human organs for millennia.
It was not the withdrawal of Nurgle's favor. Something in realspace was suppressing the connection.
Kossolax recognized the sensation first.
His head snapped toward the viewport. For a moment, Agripinaa replaced Cadia in his vision: Talon weapons gutting his fleet while the artificial world smothered the Warp and rendered the system's Mandeville calculations useless.
"It is coming," he growled.
Abaddon turned toward him. "What is?"
"The world from Agripinaa." Kossolax stepped backward as teleportation light gathered around his armor. "It is coming here."
Abaddon moved to stop him, but Kossolax had already vanished. The teleport flare collapsed with a thunderclap, leaving scorched deck plating and the fading stink of ozone.
An alarm sounded from the forward auspex stations.
A dimensional aperture opened within Cadia's orbital theater, directly between the planet and the Blackstone Fortresses. It did not resemble a warp translation. No empyric storm preceded it. No Gellar alarms activated. Space simply darkened along a vast circular boundary, and the interior of that boundary ceased to display the stars behind it.
Three spheres emerged.
The central body was an artificial planetoid sheathed entirely in metal. Layered armor belts encircled its surface, interrupted by weapons arrays, launch cavities, heat-dissipation trenches, and gravitic structures large enough to appear on the Vengeful Spirit's scopes as mountain ranges. Two smaller weapon-moons accompanied it, holding perfect formation as all three crossed into realspace.
They resembled planets only because no conventional category of warship was large enough to describe them.
Abaddon recognized it from Kossolax's fragmented, furious reports, the artificial world that had destroyed nearly eighty percent of the Foresworn fleet at Agripinaa.
Now that same weapon had come to Cadia.
The Celestial Engine.
It advanced until its armored bulk stood between the Blackstones and their target. The two weapon-moons separated slightly, widening the defensive formation. At once, the suppressive field around the construct intensified. The lone warp rift contracted further, and the Blackstone Fortresses lost another portion of their accumulated charge.
Across the Vengeful Spirit's displays, target returns multiplied faster than the bridge crew could classify them. The central planetoid possessed thousands of potential weapon apertures. The moons carried launch systems large enough to fire capital-ship ordnance in massed salvos. Gravitic fields around all three bodies interfered with conventional rangefinding and distorted the trajectories of nearby debris.
Abaddon's surprise lasted less than a heartbeat.
"All fleets, prepare for combat," he ordered. "Screen the Blackstone Fortresses. Attack squadrons will target the moons. Heavy vessels will concentrate upon the central body. Keep the warp rift open at any cost."
His commands passed through encrypted vox channels, astropathic bursts, and daemonic relays. Across the system, Chaos vessels broke from bombardment formations. Engines flared. Gun decks rotated toward the new threat. Attack craft were recalled or redirected while carriers rushed to launch fresh wings.
Abaddon studied the tactical display as the armada reformed. If the fleet had possessed only conventional warships, he would have considered withdrawal immediately. The Celestial Engine had already demonstrated what it could do to Kossolax's forces, and its suppressive field threatened every vessel dependent upon the Warp for maneuver or escape.
But the Black Legion still possessed two Blackstone Fortresses. Their warp-cannons had been disrupted, not destroyed. If the allied fleets could overload the Celestial Engine's defenses or force it to divide its attention between Cadia and the orbital battle, the Blackstones might complete another firing cycle.
The warp rift had not closed completely. A retreat remained possible, provided the fleet preserved access to the outer translation boundary.
There was also the matter of authority. If Abaddon fled the instant an unknown enemy appeared, every warlord present would remember it. The Thirteenth Black Crusade might survive the retreat. His command over it would not emerge intact.
Typhus reached the same conclusion. He activated the teleport homer linked to the Terminus Est. The suppressive field caused the signal to stutter, but the ancient plague ship acquired him before the connection failed. His bloated form disappeared amid diseased green light and a swarm of flies that did not vanish with him.
The Red Corsair captain followed a moment later, returning to his flagship to organize Huron's squadrons. Unlike Kossolax, he did not flee the system. Talon vessels were precisely the prize he had come to claim, and the arrival of their greatest weapon had transformed an abstract promise into an immediate opportunity.
Abaddon opened a command channel to the Conqueror.
No response came.
He ordered the signal repeated at maximum power. The channel remained empty, not obscured by interference, but deliberately severed.
A navigation officer enlarged the Conqueror's position on the central display. The Foresworn flagship had already reached the shrinking warp rift. Half its immense hull had crossed into the Immaterium, while its engines forced the remaining mass through before the Celestial Engine's suppression field closed the route. Other Chaos escorts that tried to follow were thrown aside by its drive wash or left behind without hesitation.
"Treacherous bastard," Abaddon muttered.
There would be a reckoning if Kossolax survived. For the moment, anger was less useful than geometry. Abaddon began dividing the fleet into layered attack groups, placing expendable raiders ahead of the capital ships and assigning the heaviest vessels to protect the Blackstones. He ordered separate bombardment solutions for each weapon-moon, preventing one damaged command link from disrupting the entire assault.
The Celestial Engine did not fire upon them.
That disturbed Abaddon more than an immediate attack would have.
Its two moons rotated toward Cadia instead. Thousands of launch apertures opened across their armored surfaces. Within seconds, synchronized salvos erupted from both bodies, filling the void with engine flares.
The Chaos fleet identified the projectiles as torpedoes. Point-defense systems activated throughout the Blackstones' screening formations. Gun crews tracked incoming vectors. Escort captains maneuvered into interception positions, expecting the moons to sacrifice massed ordnance against the ancient fortresses before their warp-cannons could recharge.
The torpedoes did not attack the Blackstones.
Their guidance systems altered course in perfect coordination. Entire waves separated around the fortresses, curving beyond their weapon arcs and avoiding the densest formations of Chaos ships. Midcourse gravitic drives corrected their trajectories with an accuracy no Imperial torpedo could have matched.
Then they descended toward Cadia.
The first projectiles struck the upper atmosphere and divided. Their outer shells broke apart into hundreds of smaller bodies, each protected by a short-lived phase field and ablative armor. Burning trails spread across the planet's sky as the payloads separated toward fortress complexes, command zones, surviving defense lines, and preselected deployment areas.
They were not conventional warheads.
Each carried a hardened teleportation beacon with its own power cells, shield projector, and automated relay, designed to link nearby Imperial positions to Talon's tactical network. Some would be destroyed during descent. Others would land outside their intended zones or bury themselves beneath rubble. Enough would survive. Talon's deployment doctrine had never depended upon every component working perfectly. It depended upon sending enough components that failure ceased to matter.
The Celestial Engine transmitted at the same moment. Its central body became a system-scale coordinate anchor, projecting a stable dimensional reference through the interference surrounding Cadia. The signal passed through realspace without touching the Warp.
Every Talon Navy vessel waiting at its assigned holding coordinates received it. Dimensional engines moved from standby to full output. Navigation systems locked onto the Celestial Engine, then refined their solutions through the beacon network falling toward the planet.
More than two hundred dimensional apertures opened around the artificial world.
From each one, a warship emerged.
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