The Red Gate's mutation was visible before he reached the staging chamber.
The mana-signature read had started degrading at approximately two hundred metres of approach — the specific quality of a dimensional boundary in active failure, the tear's edges losing the coherent crystalline structure that held stable portals open and acquiring instead the volatile, non-equilibrium state that the Valerian archive classified as pre-collapse. The colour shift from standard crimson to the deep, bleeding black at the edges was the visual expression of that non-equilibrium state: void mana infiltrating the structural boundary.
He had read the emergency dispatch on the transit. The signature pattern was consistent with the class of gate failure that produced irreversible dimensional scarring if not addressed before the collapse completed. The surrounding stone was already showing the structural degradation that extended void mana contact produced.
The Dominion commander's detachment had been fighting it for six hours and had made no meaningful progress, which was accurate — suppression arrays addressed standard gate instability by reinforcing the boundary's crystalline structure. A boundary that was actively converting to void mana expression was not reinforceable by the same method.
He assessed the situation for thirty seconds.
The gate needed to be sealed from the inside, which meant going through it into whatever was on the other side, finding the structural anchor, and collapsing it at the source. This was the only mechanism that could address a void-mana conversion in the boundary without allowing the collapse to continue.
"Hold the perimeter," he said to the commander. "Keep your detachment outside the boundary. The suppression arrays are buying time; keep running them." He looked at the rift. "Don't follow us in regardless of what the monitoring equipment reads."
The commander looked like he had several objections. He processed the situation accurately and set them aside.
Markus stepped through.
What resolved on the other side of the gate was not a dungeon and not a wilderness and not a void space.
It was a civilisation.
The caldera stretched for kilometres, the volcanic ceiling's ash providing the only diffuse illumination above the dense grid of smelter towers and brass-bridged architecture that occupied the caldera floor. The scale was extraordinary — a subterranean city that had clearly been developing for longer than the mana event, longer than the standard practitioner calendar reached.
He took in the full spatial map in the first fifteen seconds.
This was the source of the gate's anchor. The dimensional boundary had opened into this caldera, and the caldera's native mana field — high-density volcanic and forge-element — was interacting with the gate's boundary in a way that was feeding the conversion. The gate wasn't mutating spontaneously. The caldera's mana was eating into the boundary from this side.
The alarms that started running through the city in the second fifteen seconds were the accurate response of a civilisation that had just detected an intrusion at their primary defensive perimeter.
He did not want a battle with the entire city's military.
What he needed was the central forge node — the structure that the Fate's Eye was reading as the caldera's primary mana output source, the point where the caldera's forge-element concentration was highest and therefore the most likely location of the gate's anchor on this side.
"We navigate toward the central structure," he said to Nagini. "If we can reach the anchor without engaging the full defensive deployment, we do that. The city's military is doing what a city's military should do — responding to an intruder. They're not the problem."
The first detachment that reached them on the primary causeway was moving with the specific discipline of a military that had done this before — the formation interlocking shields at the front, the elevated positions at the rear. The exosuits they wore were the most sophisticated runic metallurgy he had seen outside of the Imperial Guard's elite armour.
He gave them a moment to see that the two figures who had come through their gate were not immediately attacking.
Then he deployed the spatial domain at full radius.
The domain's effect in a confined volcanic environment was the same as it was everywhere else: the coordinate relationships within the field's radius reorganised to the spatial law's authority. The detachment's forward movement encountered the specific condition in which applied force did not complete the action it was designed to complete.
Not stopped. The domain was not a wall. The force they were applying through their mechs' actuators was present; the spatial relationship through which that force translated into forward motion was different.
They were effectively stationary, to their confusion and without any direct harm.
He walked through the gap with Nagini, who was doing her own version of the same thing — the spatial domain she maintained around herself at 100% spatial law comprehension handling the projectiles that the rear ranks managed to fire with the efficiency of something that had been doing exactly this for five years in Tier 5 portal zones.
He set a route toward the central forge.
Each detachment they encountered received the same treatment: the minimum spatial assertion required to create a navigable path without causing the maximum harm that a full combat engagement would produce. This was slower than a direct assault would have been. It was also the correct approach for entering an intelligent civilisation whose conflict with them was a product of reasonable territorial defence rather than genuine hostility.
The King was waiting at the central forge because the King had been watching the tactical feed since they entered the city.
Not a standard guard commander who had been caught off-guard by unusual tactics. Someone who had processed what was happening — two intruders with unusual spatial capabilities who were navigating to the central structure while declining to engage the military forcefully — and had concluded correctly that they were heading for the forge's core and had made the tactical decision to be there first.
Ten metres tall, the mechanical armour fused with the biological frame in the specific way that long-term deep integration produced. The Fate's Eye read the mana architecture: not a practitioner wearing enhanced armour. A practitioner who had merged with the forge element itself, the boundary between the person and the mechanism having become architectural rather than operational.
The twin hammers were real. The Fate's Eye mapped their properties from the ambient mana-field distortion: the left weapon drawing from the forge's plasma-temperature output, the right from the gravitational compression field that the molten core generated. Both of them tethered to the central forge's mana output.
And the central forge was tethered to the gate's anchor.
That was the situation.
The King struck without preliminary statement, which he noted as the tactical decision of someone who had already assessed that a preliminary statement would produce nothing useful.
The left hammer descended with the weight of a star going supergiant.
He displaced — the spatial Blink carrying him outside the trajectory, the coordinate compression costing him a significant fraction of his reserves because the hammer's gravitational tether was actively distorting the coordinate system he was moving through.
The distortion was the problem.
The King's weapons were actively rewriting the local spatial geometry. Every displacement he executed cost more than it should because the spatial coordinates he was moving through were not stable — they were under the influence of the forge's gravity field and the plasma compression simultaneously.
He took two of the King's hits. Not directly — the spatial field caught most of the force and redirected it, but most was not the same as all, and the residual that reached him carried enough kinetic force to communicate clearly that the King's full output was not something the spatial law at 100% could redirect indefinitely without exhausting the reserves that the distorted coordinate system was costing him twice as fast.
He needed to end this.
Nagini handled the King's right side — her spatial domain at 100% comprehension on a fifteen-foot serpent occupied enough of the coordinate system to require the King's full attention for the seconds Markus needed.
He read the King's mana architecture through the Fate's Eye.
The tether between the King and the central forge was a spatial relationship — a coordinate connection through which the forge's output fed the hammers and through which the King's mana-needs fed back to the forge. A spatial relationship at 100% comprehension was addressable.
But the tether was not the right target.
The right target was the gate's anchor, which was inside the forge's core, which was inside the central structure that the King had been standing in front of.
He looked at the situation.
The King's tether to the forge. The forge's connection to the gate's anchor. The gate's anchor's connection to the mutating boundary above.
One chain.
He applied the spatial law's full authority — not to the King, not to the hammers, not to the forge — to the coordinate relationships within the chain's final link. The gate anchor's position within the forge's core structure.
The spatial coordinate that the anchor occupied ceased to maintain its relationship with the coordinate system around it. The anchor, without its positional relationship to the forge's core, lost its structural integration with the caldera's mana field.
Without that integration, the gate's boundary on the other side lost its conversion source.
The mutation stopped.
The hammers' plasma dimmed. The gravitational distortion in the local coordinate system began to normalise — the forge's output was no longer feeding the chain.
The King's mechanical frame locked.
Not destroyed — the mana architecture Markus had addressed was the connection, not the frame itself. The King was still standing. The weapons were still present. The fusion between the person and the mechanism was still intact.
What was no longer present was the effectively infinite reserve that the gate's anchor had been providing through the forge. The King's intrinsic mana — not the forge's, his own — was now the only source.
That reserve was finite.
The King looked at him.
Whatever the expression behind the mechanical faceplate was, the Fate's Eye read the mana pattern correctly: someone making an accurate assessment of the situation's change and arriving at a conclusion.
The hammers lowered.
Markus sat down on the forge-room floor.
His reserves were at the lowest they had been since the Iron-Root Glade's hour-long extraction sequence. The doubled cost of working in a distorted coordinate system, the displacement hits, the final anchor address — all of it had accumulated at the rate that it accumulated.
Nagini coiled around his forearm with the specific warmth of a companion who had been in the fight and knew what the fight had cost.
He breathed.
The gate above, without its anchor, was collapsing — not the catastrophic, scar-producing collapse of a void-mana conversion completing, the controlled collapse of a boundary that had lost the mana source maintaining its instability. The Fate's Eye tracked the process through the caldera's ceiling and confirmed the sequence was clean.
In the staging chamber above, the commander's monitoring equipment would be reading the signature shift from catastrophic to controlled.
He sat on the floor of the Dwarven King's forge-room and let his channels clear at their own pace, and thought about the coordination that had produced this outcome — Nagini's discipline, the Fate's Eye's read of the chain, the specific spatial address that had ended the engagement without requiring him to destroy the King or the forge or the city.
The King had not moved.
He was watching Markus with the eyes of someone who had just received a demonstration of capability that exceeded his reference models, and was processing what that meant for the conversation that apparently needed to happen next.
Markus looked up.
"We came to seal the gate," he said. "Not to fight your city. The gate's anchor was inside your forge core. I've removed it. The boundary above is collapsing cleanly." He held the King's gaze. "Your forge's mana output was feeding the mutation without your city necessarily being aware of it. That's the situation."
A long silence.
The King of the Iron Engine set one hammer against the forge-room wall. Then the other.
The gesture meant what it meant.
Markus took this as the beginning of a conversation that was going to be significantly more productive than the past forty minutes had been.
He stayed on the floor until his reserves had recovered sufficiently that standing was not the challenge it currently was, and then he stood, and began.