"We've lost all our escort vessels."
Typhus's words rolled across the command deck of the Vengeful Spirit, loud enough to carry over alarms, damage-control orders, and the grinding protest of the flagship's wounded hull.
His hololithic image flickered above the strategium. Static broke his bloated face into layers of diseased flesh and rusted armor, while the winged shapes of the Destroyer Hive crawled through the transmission as black distortions. He was reporting what Abaddon's tactical displays had already made brutally clear.
Abaddon gave him no answer. He gripped the throne's armrests as another impact rolled through the ship. The deck pitched beneath him before the damaged gravitic compensators corrected, wrenching crewmen against their restraint harnesses and throwing an unsecured data-slate across the bridge.
"Port batteries under sustained attack!" a vox-officer called from the lower command pit.
"No response from weapons decks four through seven!"
"Fleet command is still compiling hull integrity. Half the surviving ships have dropped from the net!"
Reports overlapped as officers fought to impose order on failing data-feeds. Warning lumens strobed along the tiered command stations. Brass devotional panels rattled in their mountings, cracked stained-glass screens shed colored fragments onto the deck, and smoke leaked from ruptured cogitator housings. Far beneath the bridge, internal bulkheads slammed shut one after another as damage-control crews tried to isolate decompressed compartments.
Less than thirty minutes earlier, an unfamiliar energy discharge from the Celestial Engine had crossed the fleet. It had not spread randomly. Each branch had selected a ship, overloaded its void shields, then divided again toward the next target. Destroyers, raiders, frigates, and armed transports had vanished in rapid succession. The capital ships survived only because their shield generators and armored hulls endured longer. Every one of them had nevertheless been left exposed.
Then a Talon battleship had driven a lance through the Vengeful Spirit's port flank.
Abaddon knew all of this. What he needed from Typhus was a solution, not another recitation of defeat.
"Give me a viable strategy," Typhus snarled, "or I swear by the Plaguefather that I will withdraw my fleet and leave you to this disaster."
The hololith spasmed as Typhus's body convulsed aboard his own flagship. The exchange between the Celestial Engine and the Blackstone Fortress had flooded the region with gravitic disruption and violent empyric feedback. Typhus's corrupted flesh responded to every surge. Blisters swelled across his neck, split, and collapsed into weeping sores before fresh tissue closed over them. Tumors hardened beneath his skin, softened into pus, then grew again. At one moment he trembled with pleasure; at the next, his gauntlets dug into the arms of his command throne as though he were being flayed from within.
"Now is when command matters," Abaddon said. His voice remained low and controlled. "Master yourself."
Typhus leaned toward the projector. Flies spilled from the grille of his helm and broke apart into static.
"Master myself? My screening vessels are gone. Ten cruisers have been destroyed or reduced to drifting wrecks. Ships can be replaced. Veterans of the Long War cannot." His voice thickened with contempt. "You brought us directly to Cadia without understanding what guarded it. You committed the fleet before our scouts had measured the enemy's weapons. What possessed you to charge blindly into this system?"
Abaddon absorbed the accusation without answering. He could have reminded Typhus who had been responsible for the reconnaissance sent toward the Talon Sector, and who had returned with fragments, rumors, and no useful assessment of the Celestial Engine's true capabilities. The rebuke would have been deserved. It would also have wasted time they no longer possessed.
A deck adjutant emerged from the smoke below the command dais, one hand clamped against a bleeding scalp wound. He stopped at the foot of the throne and saluted.
"Warmaster, direct lance penetration on the port flank. The breach extends through three gun decks and two launch galleries. Atmosphere is gone across the affected sections. Emergency bulkheads are holding, but the outer hull is open to the void."
Abaddon's claws tightened against the armrest. The metal groaned beneath the pressure.
The Vengeful Spirit had carried Horus at the height of the Great Crusade. It had witnessed the Imperium's greatest triumphs, the rebellion that nearly killed the Emperor, and ten thousand years of war afterward. Abaddon knew its corridors, arsenals, and command decks as intimately as he knew the scars beneath his armor. Every wound inflicted upon the ancient Gloriana-class vessel felt personal.
The loss of lesser ships angered him. Seeing the Vengeful Spirit torn open awakened something far less disciplined.
"Silence!" Abaddon roared. His voice overwhelmed the alarms and froze nearby crewmen at their stations. He glared into Typhus's projection. "You cur. You would snarl at the Dark Gods themselves if they denied you your way."
Typhus went still. The anger did not leave his face, but he stopped speaking.
"This void engagement is no longer tenable," Abaddon declared flatly.
Typhus answered with a reluctant tilt of his head. For once, neither commander had reason to dispute the other.
In less than half an hour, the Chaos fleet's entire escort screen had been destroyed or driven from the formation. Every surviving capital ship had lost its void shields, and repeated attempts to restart the generators had failed while residual energy continued to tear through their systems. Another coordinated enemy salvo would not strike shields. It would strike armor, reactors, magazines, and living crew.
There had also been no response from the Red Corsairs' commander. Huron's lieutenant might have died in the opening exchange, but Abaddon doubted it. Several surviving Corsair transponders had disappeared from the tactical display without registering destruction. Those ships had almost certainly reached the warp rift and fled the system.
Forty minutes ago, victory had appeared close enough to seize. The Blackstone Fortress had entered the engagement. Cadia lay within operational reach. The enemy fleet had seemed powerful but finite. Abaddon's first instinct was still to force his remaining ships nearer the planet and launch the ground assault before the opportunity vanished.
The open warp rift made the temptation stronger. Sorcerers aboard the fleet could draw daemons into the material realm, while drop pods and assault craft delivered Legionaries onto Cadia's fortifications. If enough landing zones were established, the surface war might continue even after the fleet withdrew.
Abaddon discarded the idea as soon as he examined what it required.
Without orbital superiority, the drop formations would be tracked from launch. Talon point defenses and Cadian defense batteries would tear apart the transports before most reached the atmosphere. Any ship moving close enough to deploy heavy ground forces would remain exposed to the Celestial Engine, the pursuing battleships, and every surviving orbital weapon around Cadia. Even a successful landing would strand the assault troops without reliable reinforcement or resupply.
It was not courage to continue under those conditions. It was the waste of an army to avoid admitting that the battle had turned.
"Victory was within reach forty minutes ago," Abaddon said, the words intended for no one but himself.
Cold calculation prevailed over fury. If the Celestial Engine discharged that arcing weapon again, there might be no fleet left to withdraw.
Yet retreat alone was unacceptable. Defeat could be endured if it purchased knowledge. Abaddon needed every measurement his ships could gather on the metallic planetoid: the range of its weapons, the interval between discharges, the behavior of its defenses, and any weakness that might be exploited when he returned.
Typhus had no patience for such calculations. His projection vanished without farewell. Seconds later, the Plague Fleet began to turn toward the warp rift. Its ships pivoted slowly, corrupted drives coughing clouds of filth and frozen debris into the void before gathering speed.
The Red Corsairs had already gone. Many of the destroyed escorts had belonged to them, and the surviving Corsair captains had chosen flight the moment their commander disappeared. Loyalty to Huron Blackheart had never required dying for Abaddon.
Abaddon remained. He would withdraw, but not empty-handed.
He rose from the throne and issued three orders in rapid succession.
"Every ship capable of maintaining speed will form around the Vengeful Spirit. Rearguard squadrons will withdraw by echelon and engage anything that attempts to overtake us."
Tactical officers relayed the command. The surviving fleet icons began shifting across the strategium.
"Select ten cruisers from the western flank. Load every boarding torpedo and assault capsule they possess."
A weapons officer looked up. "With Legionaries, Warmaster?"
"No. Thralls, servitors, prisoners, and cult levies. Not one Astartes."
At that final order, Abaddon's gaze settled upon the warrior standing below the command dais.
Telemachon Lyras waited in midnight-black plate, his twin power swords held point-down at his sides. Energy crawled along both blades in narrow blue veins. Once a warrior of the Emperor's Children, he had become one of the Ezekarion, the warlords who helped Abaddon forge the Black Legion from the divided remnants of the Traitor Legions.
Telemachon had led boarding actions through burning engine decks, breached fortress-monasteries under active bombardment, and killed his way through command sanctums whose defenders had believed their doors impregnable. Where other warriors saw a sealed hull, he saw a challenge to his skill.
His helm turned toward the tactical image of the Celestial Engine. His hands tightened around his sword hilts.
"Not this time," Abaddon told him. "We have not confirmed whether the enemy's shield excludes all physical matter or only munitions above a certain velocity. I will not spend one of my best commanders to answer a question that can be put to slaves."
Telemachon's posture remained formally respectful, though disappointment sharpened his reply.
"As you command, Warmaster."
"Remain here. If the first wave penetrates, you will lead the second."
That concession satisfied him. He stepped back beside the command throne, watching the preparations with the fixed attention of a predator forced to wait while lesser creatures tested the trap.
Abaddon personally supervised the operation. He had no intention of trusting the conclusion to an officer who might confuse hope with evidence.
Across the selected cruisers, launch crews emptied prison holds, slave decks, and labor compartments. Mortal thralls were packed into restraint couches inside boarding torpedoes. Cybernetic servitors were hardwired to breaching systems. Cultists volunteered after being promised that survival would earn them a place among the Black Legion, while condemned crewmen were loaded at gunpoint. No one told them that their real purpose was to produce telemetry.
If the torpedoes crossed the shield and struck the Celestial Engine's hull, the survivors would cut their way inside and activate locator beacons. Telemachon and the Black Legion's veterans would then follow.
If they failed, Abaddon would learn how.
Loading reports arrived one after another. The ten cruisers confirmed their launch tubes full, guidance systems synchronized, and attack vectors calculated. Each captain received the same instruction: approach, launch everything, record every interaction with the target's defenses, and break away if able.
On Abaddon's command, the cruisers left the western formation.
Their drives flared as they accelerated toward the Celestial Engine. The maneuver carried them across the retreating fleet's line and into the immense construct's gravitational influence. Hulls already weakened by the earlier exchange shuddered under the thrust. One cruiser vented atmosphere along its spine but remained on course. Another rolled to bring undamaged launch tubes toward the target.
Then the first wave fired.
Boarding torpedoes emerged in staggered salvos, followed by assault capsules and armored breaching craft. More than a thousand projectiles spread into layered approach patterns intended to overwhelm any defense dependent upon limited firing arcs or centralized targeting.
Their engines burned only long enough to establish course. The Celestial Engine's gravity did the rest, dragging the assault wave inward and increasing its velocity while guidance thrusters made constant corrections.
Each torpedo carried dozens of expendable lives. Cultists shouted prayers inside restraint harnesses. Servitors waited without comprehension. Prisoners listened to the hull vibrate around them and understood from the silence of their guards that no retrieval plan existed. Altogether, tens of thousands of mortals fell toward the metallic planetoid.
Aboard the Vengeful Spirit, the tactical display reduced them to a cloud of amber icons. Telemetry poured back through encrypted channels: acceleration, hull temperature, radiation exposure, gravitic shear, target distance, shield harmonics. Abaddon watched without blinking.
Would they make contact?
The Celestial Engine answered before the first torpedo reached its shield.
Long-range interceptor missiles rose from apertures across the metallic surface and divided into smaller kill vehicles. They struck the leading formations first, forcing the surviving torpedoes to scatter. A second defensive layer followed: precise laser beams that swept through the cloud, cutting guidance assemblies, drives, and warheads apart. Closer to the target, rapid-fire emplacements filled the remaining approach lanes with concentrated energy and hypervelocity projectiles.
The defense did not fire as one indiscriminate barrage. Separate arrays tracked separate targets, reassigned themselves as kills were confirmed, and concentrated on the torpedoes most likely to survive. Every layer passed updated trajectories to the next.
Hundreds of amber icons vanished.
Some torpedoes exploded when their warheads or fuel cells were struck. Others split open and released bodies, machinery, and atmosphere into the void. A few lost their drives but continued falling under gravity, tumbling end over end toward the target.
Those unguided wrecks were not ignored. The defense grid understood that mass remained dangerous even after propulsion failed. Lasers cut the larger fragments apart until only debris clouds continued toward the shield.
A fraction of the assault wave survived.
The first intact torpedo struck the energy barrier nose-first. It did not pass through, and the field did not yield. The armored prow collapsed into itself. A heartbeat later, the rest of the craft flattened against the invisible boundary and disintegrated in a white burst of plasma, metal, and vaporized flesh.
Three more hit at different angles. Their breaching charges detonated against the outside of the field, spreading fire across its surface without opening a gap. Another torpedo attempted to decelerate before contact and crossed the final kilometer at a fraction of the others' speed. It stopped just as completely. Its hull buckled, ruptured, and spilled its occupants across the barrier. None passed through.
Even debris measured in fragments smaller than a human hand was deflected or destroyed. The shield showed no local collapse, no visible depletion, and no delay while transferring intercepted matter elsewhere. It behaved less like an Imperial void shield than a continuous exclusion field wrapped around the entire structure.
The last surviving assault ram was the heaviest craft in the wave. Its pilot drove every remaining measure of thrust into the impact. For an instant, its armored prow remained intact against the barrier. Then structural stress traveled backward through the vessel. Compartments folded in sequence, crushing everyone aboard before the reactor failed and erased the wreck in a silent sphere of light.
The final amber icon disappeared.
No boarding signal came back.
Abaddon felt disappointment, but not surprise. The assault had failed as an attack and succeeded as an experiment.
The collected telemetry demonstrated that the Celestial Engine's shield could stop solid matter across widely different masses, velocities, and approach angles. Conventional boarding torpedoes, assault boats, ramming vessels, and drop craft would accomplish nothing while the field remained active. Sending Astartes in the first wave would merely have replaced useful data with irreplaceable corpses.
Only teleportation remained worth testing, and even that would require precise internal coordinates, suppression of the enemy's interference, or a way to force the shield offline. It was not yet a solution. It was a direction.
Abaddon ordered the complete combat record copied into the Black Legion's sealed archives. Every fragment of impact telemetry were preserved for later analysis. The next fleet to face the Celestial Engine would not approach it in ignorance.
"This war is not over," Abaddon muttered.
He closed his lightning claw. Power crackled between its talons as he stared through the fractured forward viewport at the Talon battleship pursuing them. The enemy vessel continued to gain despite the wreckage and burning ships drifting between them.
Black Legion cruisers moved to block its path. They advanced in staggered lines, presenting armored prows, launching their remaining missiles, and turning broadside as soon as their guns reached effective range. Each ship committed to the rearguard understood what the order meant. They were not expected to defeat the pursuer. They were expected to force it to slow, maneuver, and kill them one at a time while the Vengeful Spirit escaped.
The first cruiser opened fire. The pursuing battleship answered. Light washed across the command deck as another loyal vessel to Abaddon began to die for the seconds he required.
The Warmaster of Chaos turned away, already calculating his next move.
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