Solk-Tertius Star System
Tolaramino stood on the first orbital defense platform that had just been completed, gazing at the distant star field that had been utterly transformed.
Eight months.
Five thousand orbital defense platforms, all constructed and fully operational.
Twenty-two refitted satellites, now serving as critical nodes in the star system's defense network.
Two hundred cruiser-class warships and twenty-two Emperor-class battleships formed the permanent fleet, responsible for patrol and rapid response.
This was a complete defensive system — one that was, in theory, flawless.
But Tolaramino knew that theory was only theory. True defense had to be tested in actual combat.
What he needed to build was not merely the frontline of the Solk star cluster's defenses. This place would also serve as a future launching point for their campaigns, and he had to ensure that his plans would connect with the transit routes Berossus was constructing. This had added enormous difficulty to his work.
His gaze fell on Platform Thirty-Seven of the outermost defensive ring. Its position in the overall layout should have been optimal — yet Tolaramino kept feeling that there was a minuscule blind spot in its firing arc coverage.
Only 0.3 degrees.
Under normal circumstances, no enemy would ever be able to exploit such a gap.
To do so, an enemy would need to precisely map the entire defense network's fire distribution, maneuver their fleet into exactly the right position at exactly the right moment, and find and breach the opening within precisely the right window of time.
It was nearly impossible.
But Tolaramino thought of the traitors from his training days.
What if a Primarch personally led the assault?
This heretical thought took root in his mind, impossible to suppress.
"Logic Engine."
"Retrieve the firing data for Outer Platform Thirty-Seven. Run simulations focused on enemy forces exploiting that 0.3-degree blind spot. Enemy forces designated as… Space Marine Legions."
He hesitated slightly as he named the enemy — suspecting brothers he had once fought alongside was not something anyone could do easily.
Zero-point-three seconds later, the holographic projection began scrolling through an enormous volume of simulation data.
Ten thousand runs, each one probing that tiny blind spot.
The Space Marines' most elite fleet compositions, vessel type configurations, breakthrough speeds, attack angles — every variable was cycled through.
Tolaramino's gaze locked onto the data.
Simulation 734: A small Space Wolves fleet exploited the blind spot and penetrated three kilometers before being intercepted by mid-layer defense platforms.
Simulation 1,207: A mid-sized Night Lords fleet exploited the blind spot and penetrated eleven kilometers, inflicting minor damage on the inner defense platforms.
Simulation 3,422: A main battlefleet composed of Imperial Fists and Iron Hands exploited the blind spot and penetrated thirty-seven kilometers, threatening the core fortress.
…
After ten thousand simulations, the Logic Engine's final assessment was that the probability of the blind spot being successfully exploited was only 0.37 — and even in the worst-case scenario, the most severe outcome was a threat to the core fortress.
The odds were low. But Tolaramino knew exactly how formidable the Primarchs truly were.
He had once served under Horus and had witnessed the Warmaster's command and power during the Night Lords' decapitation strikes.
Tolaramino had no doubt that the First Returned could absolutely find this vulnerability.
He ran simulations on the Logic Engine, modeling how patching the blind spot would affect the defense platforms, and eventually arrived at a solution with perfect coverage.
Tolaramino actually enjoyed this feeling — finding flaws, solving problems. It was just like the old days at the front lines, where he always hunted for gaps in the enemy's defenses. He had always found them, and he had always led his brothers through, punching clean holes in the enemy line.
---
"Not bad."
Tolaramino and his escort felt a sudden jolt of alarm — but the familiar voice that reached them made their instinctive alertness dissolve at once.
A figure stood before them in a simple white robe, long black hair drifting in the void. Resting on his head was a wreath of green laurel, shaped from psychic energy by Perturabo himself. His deep blue eyes regarded his sons with calm serenity.
"Father."
The men instinctively moved to kneel, but Perturabo restrained them with a gentle push of his will.
He had come to see their work with his own eyes — even though he already knew everything without needing to.
His gaze moved across the defense platforms. Tolaramino's heart climbed into his throat. This figure — towering in his Terminator plate, nearly as massive as Ferrix — looked, in this moment, oddly like a child anxious about something. He was afraid that the plan he had poured his heart and soul into might contain some glaring flaw.
He didn't want to disappoint his father.
"That fire position — was it built to cover the blind spot on that defense platform?"
Perturabo asked suddenly, his voice carrying no readable emotion.
Tolaramino was startled. His father had noticed it that quickly?
Then his earlier suspicion had been correct. A Primarch truly could find this vulnerability.
"Yes."
"The blind spot could be exploited by an enemy and used to directly threaten the defensive line — even the command post inside the planet could be at risk," he explained.
"And the power system delay? How long did it take you to find it?"
Perturabo's gaze had moved to the satellite in the foreground, where the Iron Circle was carrying out repairs.
"Two days, Father."
Perturabo turned to look at his son.
Tolaramino felt as though an enormous weight had settled onto his shoulders.
"You spend every day searching for these flaws?"
"Yes, Father."
"How many have you found? How many resolved?"
"Twenty-two in total. Twenty-one have been resolved. The one you just identified is the last remaining."
Perturabo gave a slow nod.
He stood there, watching the construction crews who were still laboring in the distance.
The weight on Tolaramino pressed heavier.
"This defensive system has three fewer vulnerabilities than the one I designed for Olympia."
Tolaramino froze.
By the time he came back to himself, Perturabo was already gone.
Tolaramino stood in place, the words echoing in his mind, over and over again.
Had his father just… praised him?
He wasn't certain. His father's words were always so measured, so spare — never carrying a single unnecessary trace of emotion.
Could he really be so clever as to have found flaws even his father had missed?
Tolaramino instinctively rejected the idea.
It must have been a warning. There must still be vulnerabilities he hadn't yet found.
He shook himself back to the present and returned to his duties.
---
Solk-Secundus Star System, Seventh Satellite — Supply Station Control Center
Berossus stood before the holographic projection, eyes fixed on the labyrinthine transport network map that looked dense enough to suffocate.
Forty-seven primary shipping lanes. Eleven supply stations. Tens of thousands of transit nodes, running with precise coordination under his management.
Neither he nor his escort had noticed that someone had appeared behind them.
The transport efficiency of the Third Lane had declined by 0.0002% compared to the previous day.
A figure so negligible that in any supply system across the Imperium it would never be recorded, let alone analyzed.
But the Berossus of today cared very much about problems like this.
His fingers traced the holographic display, pulling up the Third Lane's detailed data. His gaze swept rapidly across the figures, his superhuman mind racing to locate the tiny anomaly.
One minute later, he found it.
A loading unit at Transfer Station Seven on the Third Lane had experienced a 0.3-second delay yesterday.
That delay had extended the docking time of one transport by thirty seconds, which had in turn disrupted the rhythm of the entire lane.
Berossus's fingers moved across the control panel, pulling up the maintenance records for that loading unit.
The records showed the unit had been running continuously for 3,700 hours without a single servicing. By standard protocol, it should have undergone routine maintenance at the 3,000-hour mark — but the engineer responsible for the unit had overlooked it.
Berossus's gaze settled on the engineer's name.
Vitaly Kern. Thirty-seven years old. Received a full education at Olympia's Fourth Academy. Had worked for two years on Satellite 9527 in the Olympia system. Performance rating consistently maintained at Good.
This was his first error.
Berossus left a note on the engineer's file: "Insufficient awareness of maintenance cycles. Requires retraining."
Once the matter was resolved, he continued checking for further omissions.
This was the first time he had taken on a responsibility of this magnitude. He didn't want to disappoint his father.
---
"You're thorough."
The sudden voice made Berossus and his escort instinctively draw their weapons — but the sight of who had appeared behind them left them startled.
"Father."
Perturabo stopped them from kneeling.
"A discrepancy so small it barely registers — I'd wager very few would ever catch it, even within Olympia itself."
"It is my duty," Berossus replied, uncertain how to respond to his father's praise.
"That loading unit," Perturabo said suddenly.
"Thirty-seven hundred hours without maintenance — yet its performance curve shows its actual wear is seventeen percent below projections."
"The engineer's maintenance schedule was late. But his operating method extended the equipment's service life."
Berossus stared at him. Had they stumbled onto a hidden talent?
"Recall him. Have him write an operational report analyzing why his methods extended the equipment's lifespan. If the report is satisfactory, add him to the priority engineering development track."
"Yes, Father."
"Also — the plan you designed is an improvement over the first system I drafted. Efficiency is up by 0.04%."
Perturabo left. But long after he was gone, Berossus's heart remained unsettled.
---
Solk-Prime, Fourth Planet
Dantioch stood at the core of the war fortress, studying the towering crystal cluster before him.
From the initial surveys, to the design of the plan, to the direction of construction — he had participated in every step himself.
The thousands of precise cuts, the tens of thousands of intricate assemblies — every operation had to be accurate to the micrometer. Now the crystal cluster had been transformed into the fortress's heart. It radiated a deep, cold blue luminescence, like a sleeping core, supplying energy and protection to the entire war fortress.
But Dantioch's brow was furrowed, because an enormous new ore vein had been discovered beneath the crystal cluster.
Two trillion tons of crystal. Purity at 99.3%. Depth ranging from 15,700 to 18,200 meters.
It was undeniably extraordinary news. When Dantioch first discovered and reported it, nearly everyone had immediately recognized they'd struck treasure. His commanding officer had dispatched two additional Titan engineering legions to assist him.
But the problems that came with it were giving him no small amount of grief.
He had already designed seventeen extraction plans. Every single one had been rejected by the Logic Engine — either the risk was too high, or it would result in unacceptable waste of the crystals.
This left Dantioch, who had already completed the war fortress itself, deeply frustrated.
His commanding officer and his father had entrusted such great expectations to him. His brothers were all watching his performance. A windfall practically delivered to his door was now lodged in his throat, and he couldn't swallow it.
He needed an eighteenth plan. His gaze settled on the crystal cluster, his mind running at full speed.
---
"What are you thinking about?"
A voice sounded behind him without warning.
Dantioch's entire body went taut.
He turned — and saw the tall silhouette.
"Father."
Both of Dantioch's hearts were hammering.
Perturabo stepped to his side and looked down at the vast crystal ore vein below.
His deep blue pupils reflected the glow of the crystals. Dantioch noticed that his father's eyes were still brighter — and found himself momentarily transfixed.
"Your plans — the core logic of all of them was to use this crystal cluster as the anchor point?"
"Yes, Father."
Dantioch caught himself and responded quickly.
"Your approach was correct. But you made one mistake."
Perturabo raised one finger slightly. A holographic projection unfolded before him, displaying the three-dimensional structure of the enormous ore vein.
"You assumed the vein's structure was uniform."
His finger moved across the display, highlighting a region.
"But here — there is a fault line."
Dantioch stared at the area.
A fault line?
He had studied the vein's data countless times. How had he never found anything of the sort?
"Depth: four thousand one hundred meters. Width: thirty-seven meters. Orientation: forty-three degrees from the vein's primary axis. Your survey team scanned three times, but their equipment was disrupted by the crystal's own energy field. They missed the fault."
Perturabo's finger continued moving, marking additional areas.
"Here. Here. And here — seven fault lines in total."
"If you can use these faults as natural channels, your extraction plan will not need to excavate twenty-two vertical shafts from scratch. You only need to clear and reinforce these faults to reach the core of the vein directly."
The faults had been invisible to mechanical sensors. But they had not escaped Perturabo's eyes.
With a single glance, he had seen the solution to the problem that had tormented Dantioch.
A casual sweep of his hand across the holographic display, and several zones were marked clearly.
"These are the ones. Have the Logic Engine and the excavation teams take note."
Dantioch stared at the marked gaps on the display, his mind already racing ahead to the next plan.
"This war fortress's design is somewhat better than what I drafted before. You have a real talent for using your environment to your advantage. Well done, Dantioch."
Perturabo's words pulled Dantioch back from his thoughts — but Perturabo had already vanished.
Dantioch stood there for a moment, briefly dazed. Then he immediately called up the Logic Engine and began running simulations for the next round of plans.
I have to produce results.
Dantioch thought.
---
Aboard the Iron Indomitable — Bridge
Ferrix surveyed the charts of eight star systems laid out by the Logic Engine, studying their development and construction progress.
Every entry was annotated with dense clusters of nodes and milestones. The extraction progress of forty-seven mining planets. The terraforming of three agricultural worlds. The transformation of sixty-two habitable or requiring-migration planets. The construction status of five thousand five hundred and forty-one satellites. The building progress of fifty-six thousand three hundred and twenty-one orbital platforms. The real-time data for fourteen thousand primary and secondary transit lanes across eleven star systems…
The numbers shifted without pause. The data updated every moment. Every second brought a new wave of problems waiting for Ferrix to resolve.
If not for the Logic Engine assisting him, Ferrix suspected he would have already been worked to death.
He had now been working continuously for two hundred and twenty-two hours.
His body could withstand it. As an Iron Warrior who had completed the original forging surgeries, he could sustain combat for dozens of hours without rest.
But the data, the plans, the problems — they piled up like mountains in his mind. Even when he closed his eyes, the numbers kept dancing, the plans kept running.
It was torturing his mind in a way the Logic Engine could not help with.
He had shed his Terminator plate, and his body was now threaded with tubes feeding nutrient fluids and supplements, sustaining his brain through this brutal high-intensity operation.
Ferrix suddenly found himself missing the training days. At least after training, he could have a serving of his favorite durian, preserved egg, and folded-ear root flavored nutrient paste.
Now he sat in an iron chair built to his exact dimensions, processing data so overwhelming that a single glance could induce vertigo.
Ferrix felt his frame — enhanced by twenty-two surgeries — beginning to flag.
But he could not stop. This project was critical, and as Legion Commander, this burden was his to bear.
---
"Commander."
A voice sounded beside him.
Ferrix opened his eyes to find a medical servitor hovering nearby.
"Your physiological indicators show you have been working continuously for two hundred and twenty-two hours. Per Olympian standards, you require a minimum of four hours of rest."
Ferrix knew it. He had to rest — otherwise fatigue would cause him to make errors in the face of all this data.
At his level of command, even the smallest mistake in any decision could spell disaster for the engineering forces on the ground and the Legion constructing defense platforms in orbit. Months of grueling work could be rendered void in an instant.
Ferrix wouldn't let that happen. The Logic Engine couldn't handle decisions of this nature.
Just managing eleven star systems' worth of construction problems felt like it was about to blow his enhanced brain apart. He didn't dare imagine what it would take to govern an entire sub-sector or sector — policy, welfare, construction, and everything else.
For the first time, he felt genuine admiration for the Imperial Regent. That silver-haired old curmudgeon was insufferable, but the man's abilities were truly extraordinary.
And at this very moment, Calliphone — contending with Olympia's administration and the soon-to-be-launched migration policy, plus all the plans passed by the Iron Council and the policies awaiting implementation — felt her head might split open.
Maintaining a single star system was already a stretch. Now eleven enormous new systems had been added, along with all their resources. Calliphone could feel her lovely hair falling out one strand at a time.
Ferrix wasn't sure if he fell asleep or not.
His brain kept running — the images of planets, the flow of data, the progression of plans — surfacing and resurfacing in his mind.
He was woken. Four hours had passed, and yet it felt like no more than a single second.
His sleep had been poor. A heavy dose of medication was injected into his body, and his mind felt marginally better.
But the moment he opened his eyes, he saw a figure that had no business being here.
That tall silhouette, standing before the holographic projection with its back to him.
Both of Ferrix's hearts accelerated at once.
"Father."
He struggled to pull the tubes free and rise to greet him — but he was genuinely weakened.
Perturabo turned around and placed one large hand lightly on his son's left shoulder.
"Stay down. Rest first. Your mind has been running far past its limits."
"I'm fine, Father. I can still—"
Perturabo stopped him.
"Your strengths don't lie here. You are suited to leading a Legion on the offensive in a campaign — not in construction and administration."
"I think I have been too demanding of all of you. Even my brothers — none of them were masters of everything."
"Father, I—"
"Rest first. I'll dispatch engineers from the Iron Council on Olympia to assist you. Your role is to make the decisions. Let them handle the rest."
Ferrix opened his mouth, but found no words. Perturabo gave a light wave of his fingers, and Ferrix's vision went dark as he sank into deep sleep.
Perturabo looked at the stack of unprocessed communications and decisions on the display panel. Without a word, his right hand swept across it at speed.
Resolving these problems cost him nothing. He even went so far as to personally work through the finer corrections — small errors, micro-adjustments to gun emplacement angles on defense platforms — factoring in every detail with his own hand.
The issues that had tormented Ferrix, robbing him of sleep and peace, were to Perturabo the kind of thing resolved with a single glance.
In less than a quarter of an hour, he had resolved nearly everything. He compiled his revisions and adjustments into a single document and left it where Ferrix would see it when he woke.
He looked at his son, now soundly asleep.
Perturabo allowed himself a faint smile.
None of them had disappointed him. They had all done well.
---
Eighteen hours later, Ferrix woke from deep sleep.
It was, he decided, the most restful sleep he had ever had in his entire life. No pressure of a campaign. No strategic deliberations before an assault. No cascade of factors to consider for construction projects.
"Commander, the Iron Council personnel will arrive in one hundred and thirteen hours."
The moment he woke, the Logic Engine's voice reached him, snapping him back into readiness.
His spirits sagged again almost immediately.
But when he took the work panel, Ferrix was surprised. The backlog was remarkably thin.
"How long did I sleep?"
"Eighteen hours and three minutes exactly, Commander."
"But this…"
"Lord Perturabo resolved those matters for you. There is also a document — some adjustments and corrections he made. Please review it."
Ferrix stared at the materials his father had organized for him. For a moment, he was speechless.
But shortly after, he threw himself back into the work.
The rock strata in the mining zone on the Third Planet had exceeded projected hardness. The foundry's power system on the Fifth Satellite was showing fluctuations. The defense platform foundations on the Ninth Planet had settled and needed reinforcement. Transport efficiency on the Seventh Lane had dropped by 0.3%…
Ferrix felt both of his enhanced hearts cramp. For some reason, the moment anything related to governance and construction came up, he now felt an instinctive, bone-deep resistance.
It hadn't been like this in the beginning. What kind of Commander produced no results?
But it was plainly clear — his talents simply ran short in this area.
Thank the void the Iron Council people were nearly here. Ferrix genuinely did not want to keep exhausting himself over construction work like this.
If it were building a single war fortress, constructing an opulently restrained palace of subtle luxury, or laying down a defensive line that a Primarch himself would commend — those, Ferrix was fairly confident he could accomplish now.
But this sort of thing, clearly suited to professional specialists, was simply not his calling.
Every craft has its master.
Ferrix only now truly grasped the severity of that principle.
Well. Back to work.
---
Olympia — Iron Forge
Perturabo had just returned from visiting his sons.
Considering the defensive lines they had constructed, a thought surfaced in his mind quite unexpectedly.
He could simply develop a class of massive star fortresses to reinforce those lines further.
Conveniently, all those Tech-Adept trainees had been sitting around with nothing to apply themselves to. Once the designs were complete, sending them to study and work aboard the fortresses would be putting them to good use — and adding another layer of strength was never a bad thing.
While he was at it, he ought to send them to excavate the Necron tombs as well. Necron technology was extraordinarily valuable. True, Perturabo's talent for navigating the Webway was rather lacking — but when it came to researching weapons and engines, he was entirely in his element.
If something worthwhile came of it, that would be pure profit.
And even if the Necrons happened to awaken, a massive star fortress would give those oil-soaked magi the firepower to fight back.
Besides, these fortresses would provide immense support for his sons' future campaigns.
To say nothing of the fact that Dorn's Phalanx — its power self-evident to every soul in the Imperium — had already been recreated at scale within the Daemon Forge. Though the daemons who'd been stuffed into the daemon engines while it was being built had wailed and screamed to the heavens and made quite the racket.
The resources a star fortress demanded were, of course, immense. The worlds under Perturabo's control were still somewhat limited, and sustaining that kind of consumption might strain several ongoing plans.
He ran the numbers carefully.
"Fine. Build five to start — that should be just about manageable."
Still, the issue of the fortresses' mobility and maneuverability would need addressing.
Perturabo set to work on the schematics at once.
---
Elsewhere:
Dantioch was carving tunnels.
Berossus was plugging gaps and tracing faults.
Tolaramino was running defense simulations on an endless loop.
Ferrix was grimly holding down the post of supreme coordinator.
And in the Daemon Forge in the Warp, the black smoke output was prodigious.
"Go work" and wailing echoed from within, accompanied by the unceasing crack of thunder and blaze of lightning.