Gremlins.
The word appears in the oldest strata of the Adeptus Mechanicus's written records, buried in sub-archives that require senior Magos clearance to access, or in Inquisition files that are difficult to locate under any classification system. The Mechanicus has never fully agreed on what Gremlins are. The prevailing institutional position is that they are machine spirits of unusually poor temperament: invisible, persistent presences that introduce errors into complex systems, corrupt data operations at random, cause mechanical components to fail for no diagnosable reason. A problem with a religious explanation rather than a technical one.
The Inquisition's files offer a different assessment.
Gremlins are Warp entities. Not major ones. They lack the raw destructive capacity of a Greater Daemon and cannot produce the kind of wholesale corruption that would attract immediate attention. They settle into mechanical systems and remain: introducing drift, distorting calculation, spoiling calibration points by degrees too small to flag any single alert. Decades of their presence in a sufficiently complex machine can produce effects that look identical to ordinary accumulated wear. Their damage is cumulative and patient, which is precisely why they are difficult to find.
But Gremlins are not independent. They have a master.
Their master is not a Daemon Prince. He was not born from the four Chaos Gods, and he owes no faction allegiance that would make him predictable to any of them. He occupies his own domain in the Warp, shaped by his own nature: an environment of soul forges, dark machinery, and the specific kind of hunger that comes not from destruction or entropy or sensation, but from the desire to understand and possess every system that has ever been made. He is the embodiment of forbidden technology and the corruption of innovation. He makes contracts, and his contracts are scrupulously fair in their written terms, because he does not need to cheat. The terms themselves are the trap. Any Chaos entity that comes to him seeking power, or seeking shelter from faction politics, or simply seeking to barter, will find an agreement offered with both hands. The fine print is a slave contract that the signatory drafts themselves.
He is the arms dealer in the Great Game, and an unstable ally to every one of the Dark Gods.
He is the master of the soul forges and the god of machines.
He is the Arkifane, Vashtorr.
Nolan went down on one knee.
The posture was practical rather than reverential: it brought him closer to the remains of the thing on the floor, and he needed a closer look. He extended one of the Ten Rings from his forearm, letting the purple-glow ring hover forward until it made contact with the cable remnant. The metal responded to the touch with a faint residual shiver, the last trace of whatever had been animating it from the inside.
"Without the chaotic aura," Nolan said, studying the charred mass carefully, "I would not have found it at all. It was the occasional bleed-through that caught my attention. Nothing visible. Just an accumulation of something that was not quite right." He let the ring retract and looked up at Wesley's vast mechanical face. "As for what it is: one hundred percent Warp in origin."
He turned his head to look at Reditus.
"Tell me you caught the hint and already called for support."
The red light in Reditus's eye-lenses pulsed once, and then the servo-skull turned from Nolan to orient fully toward the enormous Fabricator General above them.
"Old friend," Reditus said, spreading both mechadendrite-arms outward in a gesture that managed to be simultaneously placating and absolutely serious, "I am sorry. You have been compromised by Chaos. Until we have confirmed the extent of that compromise and cleared the possibility of active corruption, we cannot accept any demonstration of loyalty at face value. That is not a judgment of your character. It is a necessary procedure."
The room was quiet for a moment.
When Wesley spoke, the mechanical voice carried its usual absence of inflection, but the content of it was careful.
"The probability of a successful outcome is one hundred percent." A pause. "The portion of my original humanity that I have deliberately retained has been informing me, for the last several seconds, that your current position is extremely dangerous for everyone involved. My data analysis provides the same conclusion by a different route."
The vast head lowered fractionally, as much as the chassis would allow.
"However. My analysis of character and the weight of old association tell me that trusting a Primarch's integrity and an old friend's judgment is the better path."
A low hum ran through the processing systems built into the palace walls.
"Several milliseconds ago, I transmitted authorization to the Forge Council of Triplex Phall. Until I have been fully examined and cleared of any suspicion of Chaos corruption, overall command authority for the Forge World transfers to the Lord Primarch. I believe this is sufficient evidence of intent."
The weapon housings that had extended from Wesley's chassis during the brief exchange of force retracted smoothly, folding back into the body until the surface was clean again.
That was the precise moment the metal door ceased to be a door.
The melta weapon discharge came from outside. It hit the door's center in a sustained burst that did not stop until the metal had passed through every state between solid and vapor, and when the heat cleared, a hole large enough for a Terminator in full plate occupied the space where the door had been.
Through it came the Terminator Guard.
They moved fast for warriors in that class of armor, pushing through the opening in a tight stack and spreading laterally the instant they were through, storm bolters and assault cannons swinging to acquire targets. The muzzles found Wesley without hesitation and locked, and the Terminators held, waiting for the order that would follow.
Nolan was already on his feet.
His hand came up, the gesture sharp enough to read across the room without ambiguity, and the Terminator Guard held position.
He looked at Wesley for a moment. Then he straightened fully and spoke, his voice carrying the specific quality it took on when something was being stated for the record rather than negotiated.
He would not behave as a tyrant toward Triplex Phall or the Mechanicus. He understood what the Forge World represented, what it contributed, and what it had taken to build it. The Magi here would retain their function, their traditions, and their right to continue their work. What changed was who stood at the top of the hierarchy. That was all.
Reditus moved forward before the silence could settle in an awkward direction.
The servo-skull's tone shifted to something more carefully calibrated: the voice of a very old entity with considerable social experience, choosing its words for maximum effect on a specific audience.
The Lord Primarch, Reditus explained, was not a figure who needed to be convinced to value the Mechanicus. He had already demonstrated this. A Primarch who was inclined toward domination for its own sake would not have appointed a servo-skull to serve as his chief Magos. That appointment was not symbolic. It carried real authority and had been honored. The character of the man could be read in the exceptions he chose to make.
Wesley processed this.
A long moment passed.
Then the Fabricator General of Triplex Phall spoke, in the same level mechanical voice, and what he said indicated that he was willing to accept the arrangement.
The tension in the room broke quietly. No single moment marked it. The Terminators began to lower their weapons by increments. Nolan said a few more words to consolidate the ground, and Wesley responded with the measured brevity of someone who had calculated the best available outcome and chosen it. Several minutes of practical discussion followed, covering immediate logistics and nothing more, and by the end of it the confrontation that could, in different hands, have set the Carcharodons fleet against the full military complement of a Forge World had resolved into something resembling an agreement.
The Terminator Guard withdrew to the corridor.
Reditus did not follow.
He drifted back toward the Armiger chassis that had been left near the entrance and began the process of reintegrating with it, settling back into the war machine's systems with practiced efficiency. When Nolan glanced back at him, the Armiger was already standing again, its eye-lenses oriented toward the space where Wesley's vast body occupied the center of the room.
"You're staying," Nolan said.
"If Wesley has been corrupted," Reditus said, from inside the Armiger, "then I want to be the one here for that conversation. Whatever it requires."
The implication did not need to be spelled out.
Nolan accepted this. Then Reditus spoke again, and his tone had changed: quieter, carrying something that was either caution or reluctance.
There was something Nolan should know.
Wesley Phall was not an old man.
When Reditus had first known Wesley, under Archmagos Fastinius's instruction, Wesley had been a young woman, with a body still largely composed of original biological material. The decades of augmentation and integration that had produced the mechanical structure now occupying this palace had taken place gradually, over a span of time long enough to transform the person several times over. The face at the top of that thirty-meter chassis did not resemble the face Reditus had known, and the voice carried no trace of its original register, but they were the same person.
Nolan blinked.
He looked at Reditus for a moment with an expression that resisted easy categorization, the kind of look that forms when a reasonable assumption turns out to have been wrong in an unexpected direction.
"So," he said. "Not a fellow student. A senior one."
Reditus said nothing immediately.
Nolan held that look for another moment, then something passed across his face that had nothing to do with the immediate situation. It was brief, and it was not a public expression: a trace of something that lived in a different part of his memory, called up by association. Nostalgia, perhaps, or the particular melancholy of thinking about the distance between what things were and what they become.
It passed.
"The fleet needs significant maintenance," he said, his voice settling back into its working register. "The Warp storm has not fully cleared. We will be at Triplex Phall for some time." He looked at Reditus. "I'll have Chaplains assigned to assist you in the examination. Work with them. Verify the extent of the contamination and whether Wesley is clean or not."
He turned toward the breach where the door had been.
"Don't disappoint me. Understood?"
He did not wait for an answer. The vibranium power armor's systems engaged, and he walked out through the melted gap and into the corridor beyond, the Terminator Guards falling in around him as he moved.
Behind him, inside the ancient forge-palace of Triplex Phall's Fabricator General, Reditus turned the Armiger to face Wesley's enormous mechanical body.
The servo-skull raised one mechadendrite arm and held it in the Mechanicus salute, directed at the retreating back of the Primarch still visible through the doorway.
Then the Armiger lowered its arm, and the two old acquaintances were alone.