While Nolan and the bulk of the Astartes strike force were cycling through simulator missions in the private palace, the Raven Guard were working.
The infiltration teams had spread across Triplex Phall without attracting attention, moving through the industrial corridors and foundry districts under Shadow Step, following the trail of mechanical anomalies the way a tracker follows disturbed ground. What they found, over the course of their investigation, was consistent: traces of Gremlin activity distributed across a large number of mechanical systems throughout the Forge World, embedded in equipment that had been running with accumulated errors for periods that, in some cases, stretched back decades. In the worst instances, a full century or more.
This was the detail that gave one of the Raven Guard captains pause.
Chaos daemons, in his experience and in the doctrinal knowledge of the Chapter, behaved a particular way when they found purchase in the material universe. They spread. They corrupted. They worked to maximize the footprint of their presence because that footprint was, in itself, the point. Corruption was not a means to an end for a Chaos daemon. It was the end.
But these Gremlins had not spread. They had stayed. Contained within specific industrial zones, moving between mechanical systems within a defined area, not reaching outward across the Forge World to corrupt new ground. The industrial casualties they caused were real but inconsistent, almost incidental, as though causing damage was not the primary purpose of their presence.
The captain assembled his intelligence reports in a quiet corner of a foundry district and worked through the pattern.
What he was looking at resembled, in its structural logic, a surveillance network. Not identical to the methods the Raven Guard used for their own intelligence operations, but similar in principle: distributed nodes, each occupying a fixed position, collectively covering a larger area than any single node could monitor alone. The output of such a network was not corruption. It was information.
The Gremlins were not here to destroy the Forge World. They were here to watch it.
The captain prepared to pull his scattered teams back to a central point and arrange Thunderhawk transport to bring the report directly to Nolan. Whatever hidden entity had been receiving sixty or a hundred years of detailed intelligence on a strategically significant Forge World in the Far Eastern territories warranted the Primarch's immediate attention.
He was in the process of sending the recall signal when the Warp storm changed.
The shift was not gradual. The storm that had been slowly releasing its grip on the outer system contracted, intensified, and then expanded again in a matter of seconds, and the quality of it was different: purposeful rather than turbulent, as though the storm had remembered what it was for.
The auspex arrays on Triplex Phall's orbital defense platforms registered the contact a fraction of a second before the naked eye could have.
What entered the outer detection range of the Forge World's sensors was enormous. Not battle-barge enormous, not cruiser-squadron enormous. The kind of enormous that required the auspex operators to verify their readings twice before accepting them, because the size of the contact registered in the range normally associated with celestial bodies. The vessel, if vessel was the right word for it, appeared to have been assembled from components that had themselves been enormous: space hulk sections, derelict ship masses, mechanical structures from sources that the identification systems could not match to any known classification. All of it had been joined together by methods that the sensor readings suggested were not entirely conventional, producing a whole that was visually and structurally coherent only in the sense that it was all moving in the same direction at the same speed.
It was accelerating toward Triplex Phall's low orbit.
The Ark of Omen.
The defense platforms and the Carcharodons fleet in the star port docks detected it almost simultaneously. The mortal crews and Magi at the sensor stations had perhaps three seconds of alarm-transmission time before the Ark of Omen's weapon arrays opened fire.
The attack came as laser batteries and energy lances, cutting through the void in simultaneous salvos that treated the distance between the Ark and Triplex Phall's orbital infrastructure as a formality. Defense platforms that had been moving to full combat footing absorbed direct hits before their shields were fully charged. The Carcharodons fleet, caught in the constriction of star port docking cradles, could not maneuver, and the ships in the outermost berths took the worst of the early fire.
Simultaneously, the Ark of Omen's ventral sections opened.
Dreadclaw assault pods launched in numbers, pouring outward from the massive vessel's hull in tight clusters, each one surrounded by Hell Talons flying tight interference patterns that laid intercept tracks across the defensive anti-aircraft fire that Triplex Phall's surface batteries were already beginning to produce.
The alarms reached every foundry district on the surface within seconds of each other, transmitted through the Forge World's internal communication network in the form of binary urgency codes that required no translation. The sky above the industrial hive sectors shifted: the deep red ambient glow of the Great Rift was joined by the white and orange traces of anti-aircraft rounds climbing through the haze in continuous streams.
Triplex Phall's ground defenses were not those of a typical Imperial world.
The Forge World produced weapons for the Imperium's eastern territories. Its garrison knew, in practical rather than theoretical terms, what those weapons could do, because they had been the ones building them. The Skitarii cohorts mounted on ground vehicles were moving before the Dreadclaw cloud had finished crossing the upper atmosphere. Automata cohorts directed by Tech-Priests followed in tight formations, their weapon systems already calibrated to the descending targets.
The anti-aircraft fire consumed two-thirds of the Dreadclaws before they reached the surface.
The Hell Talons fighting the intercept were good. They were not good enough. The fire coming up from Triplex Phall was continuous and accurately directed, and the Hell Talons that flew to protect a Dreadclaw frequently did not survive the protection.
But a third of the pods made it.
They hit the surface of the Forge World in scattered clusters across the landing zone, the impact cradles absorbing what the ground could not, and then the hatches blew outward.
The Emperor's Children descended onto Triplex Phall.
They wore the purple-red of their Legion, the paint scheme preserved or restored with an attention to detail that suggested deliberate pride in the association. The power backpacks of their armor were adorned with Chaos debris: tokens, bones, trophies, and stranger materials that had no obvious origin. They moved from their Dreadclaws with the unhurried confidence of warriors who had been doing this for ten thousand years and had found that it still worked.
The Raven Guard who had been operating in the foundry districts nearest the landing zones did not need instructions.
They came out of the shadows with krak missiles first, the warheads tracing flat arcs across the open ground toward the emerging Emperor's Children formations, hitting at the transition point between the Dreadclaw hatches and the open approach. Then the Raven Guard performed Shadow Step and disappeared again, relocating through the shadows of surrounding structures before the Emperor's Children could orient a counterfire solution, and came back in from new angles with bolters and power claws driving directly into the flanks of the landing group.
The Emperor's Children were more resilient than was reasonable.
One of them absorbed a full bolter burst that stripped the right side of his armor from pauldron to hip, exposing the corrupted biology beneath. He lost most of one arm to a subsequent hit. He kept moving. He was still waving his other arm's demonic blade in the direction of the nearest Raven Guard when the power claw caught him through the neck and down into the thoracic spine, the disintegration field doing what the explosive rounds had not.
He dropped.
A moment later, the sound came.
It arrived as something felt before it was heard, a pressure change that the inner ear registered as wrong, building in intensity across three seconds until it crossed the threshold from sound into force. The Raven Guard warrior who had just killed the corrupted Emperor's Children warrior was at the center of the wave's convergence point. The sonic attack did not impact the outside of the armor. It propagated through it, through the ceramite and the padding and the flesh beneath, and the warrior's body gave way to the physics of the situation from the inside outward, the structural integrity of everything involved resolving in the same direction at the same time.
The remains scattered across the ground.
From within a Dreadclaw at the edge of the landing zone, a Noise Marine emerged. The yellow metal tubes extending from the flesh of his armor were flush-fitted, almost organic-looking in the way they had integrated themselves, and the sonic blaster in his hands was a custom piece, the barrel geometry suggesting significant modification from standard issue. He walked with the specific satisfaction of a weapon that has been used correctly.
The Raven Guard adjusted.
They were outnumbered by a ratio of more than ten to one, and they knew it, and they continued fighting anyway with the precise and unhurried commitment of warriors who had calculated the value of the time they were buying against the cost of buying it and had found the exchange acceptable. They used the structures of the foundry district as architecture for their tactics, keeping the Emperor's Children confined to the immediate area around the landing zone, preventing the breakout that would allow the invaders to reach critical infrastructure.
The Skitarii arrived.
Rangers vaulted from the sides of the ground vehicles, deploying into firing positions while still moving, their arc rifles beginning to cycle as they landed. The vehicles themselves continued forward, carrying heavy arc gun platforms that needed the closer range to be effective. They came into the firefight from the approach angles the Raven Guard had deliberately left open, filling the gaps in the defensive line with the specific kind of firepower that only a Forge World's home garrison could produce.
The battle for the landing zone was not over. It had barely started.
But Triplex Phall was fighting back.
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