The darkness lasted four seconds.
He counted them standing at the threshold, the door closed behind him, his right hand still resting against it. The thermal overlay showed nothing. The visor's resting state: flat grey-green, no signatures, no warm masses, no cold gaps. The HUD biometrics were stable. Heart rate elevated, which was accurate. Hydration at fifty-one percent. Fatigue indicator climbing from the rest it had been accumulating.
Then his eyes adjusted and the darkness became something else.
The walls were lit. Not brightly. There was no source he could identify, no fixture, no opening to a light beyond. The light was the walls themselves. A cold blue-green residue coating the fibrous surface in irregular patches, steady and sourceless, illumination that did not explain its source. It showed what was there. He looked at the left wall for a long moment. The surface was off-white at the centre and darkened toward grey-green at the edges. It had a grain to it, like compressed wood, but when he pressed his palm against it the contact was wrong: a slight give, a fractional yield, something that stone did not do and wood did not do in quite that way.
He pulled his hand back. The wall had yielded and then returned to its original position without leaving a mark.
He was standing in a corridor roughly two metres wide. The ceiling was lower than the bridge's cavern, low enough that he could reach it without fully extending his arm. Ahead, the corridor bent left at a distance he estimated at twenty metres, the bioluminescent patches on the walls providing just enough light to see the bend but not beyond it. Behind him the door was set into the same fibrous material as the walls, already looking less like a door and more like a seam in the organic structure, barely distinguishable from the surface around it.
The thermal overlay resolved slowly. Everything was warm, not hot, not the spiking signatures of the bridge's loaded mechanisms, but a low even warmth, body-temperature, emanating from every surface in the corridor. He looked at the HUD's left panel. The steam core read full. Both arm indicators were green. The wall temperature reading showed a baseline he would need to recalibrate from scratch: the maze ran warmer than the bridge by enough to make his existing reference points useless.
He noted this and kept the thermal active and began walking.
The corridor bent left and then right and then opened into a junction: three directions, no markings, no indication of which way led anywhere. He checked the compass bearing and chose the direction closest to his current heading and kept moving. The floor was the same fibrous material as the walls, slightly firmer underfoot, no flex when he pressed his weight onto each step. Not planks. Not stone. Something that absorbed the impact of his footfall and returned it differently, a surface that gave slightly underfoot and absorbed the impact rather than returning it.
He passed two junctions and one dead end before the corridor widened into a chamber roughly five metres across, roughly circular, with three exits at irregular intervals around its perimeter. Nothing in the chamber. No chest, no mark, no mechanism he could identify. He stood in the centre of it and turned slowly with the thermal active, reading the walls. All of them warm, all of them the same baseline. Nothing distinguished any of the three exits from the others.
He chose the one that faced his compass heading most directly and moved toward it.
That was when the thermal shifted.
Not ahead of him. At his eleven o'clock, just beyond the left wall of the exit corridor he had chosen. A heat signature, warm, four or five degrees above the wall baseline. On the bridge that margin would not have been significant. Here, where the walls themselves ran warm, it was the first reading that exceeded the ambient. It was moving. Not fast. He stopped walking.
He held the corridor wall with his right hand and listened.
A clicking sound. Irregular, grouped in bursts of two and three, the clicks themselves brief and high, like something mechanical contracting rapidly under tension. He had never heard it before. He did not know what it meant. Not knowing what a sound meant in a new environment had nearly killed him on the bridge, twice, before he built a vocabulary. He stayed still and listened and the clicking continued: steady pace, three clicks, pause, two clicks, pause. The thermal showed the heat signature rounding the far end of the corridor, now directly ahead.
It came around the corner low and fast.
His first thought was that it should not be able to move the way it was moving. Four limbs, approximately, though counting them was difficult because they did not behave like four limbs. They rotated between strides, extended in directions they should not have been able to extend, folded against the central mass mid-stride and snapped outward again without breaking pace. The body itself was the colour of the maze walls, the same off-white fibrous material, roughly the size of a large dog but nothing in the movement was a dog or anything he had a category for. He had a half-second to process this before it closed the distance.
He fired the pistol at the central mass.
The shot went wide. He had aimed at where the creature was, not where the limbs' trajectory said it would be, and it closed the remaining distance and one of the rotating limbs caught his left forearm, not a clean strike but a deflection with enough force to drive him sideways into the wall. His left shoulder absorbed the secondary impact. The lasting effect registered immediately: the dense scar tissue around the extraction site, compressed between his arm and the wall, producing a broad ache he had to breathe through.
The creature was already repositioning. The clicking pattern changed, faster now, the bursts tightening, the pitch rising slightly.
He pushed off the wall and moved right, putting distance between himself and the angle it had attacked from. The thermal tracked it: moving left, not directly toward him, moving to his far left, which meant it was going to the opposite wall. Not retreating. Flanking.
He understood the flanking one beat too late. He was already tracking the thermal's leftward movement when the attack came from his right, a different limb, from a position he had not covered because he had been watching the wrong direction. It caught his right side and spun him. He kept his feet through will and the leg armour's stabilising effect and fired the pistol a second time at the mass, closer now, no chance of a miss at this range.
The shot struck centre. The clicking changed again, slower, dropping in frequency, the bursts losing their pattern and becoming single irregular ticks. The creature's movement became disorganised, the impossible limbs losing coherence, the central mass listing to the left. He stepped forward and fired a third time. The clicking stopped. The creature settled to the floor and did not move.
He stood in the chamber for a while.
His right side ached where the second impact had landed. His left shoulder was producing a sustained deep complaint from the wall contact. He pressed his right hand to his ribs and found no structural movement. Bruised, not broken, familiar. The HUD showed heart rate at one hundred and sixty-three, dropping, hydration unchanged. He had fired three shots from a pistol that had two full cells and had never been fired before this moment. He noted the waste: three shots, one creature, and one of those shots had been a miss that cost him a hit and gave the creature a second attack window.
He crouched over it.
The central mass had deflated slightly, the fibrous material releasing tension, the surface going from taut to slack. He pressed two fingers against it. The give was different from the wall's give: softer, less structural. He looked at the limbs. At every junction where limb met body, at every segment within each limb, there was a thread of dark metal. Fine, precisely placed, running through the organic material at intervals that corresponded to where a tendon would be. He followed one thread with his fingertip from the central mass to the limb's terminus. It ran without interruption, tight at rest, the tension gone now that the mass had deflated.
The threading was the movement. Without it the creature was a lump of wall material with four dead protrusions. Something had taken organic matter from the maze and put metal through it to make it move.
He stood up.
Three shots to kill it. One wrong decision that cost him two impacts and a reposition. Left shoulder aggravated. Right ribs bruised. The creature had flanked him, moved to the wall opposite before attacking from an angle he was not covering. He filed the flanking as the primary tactical note. The thermal had tracked the movement but he had been reading the thermal as approach-direction rather than as pre-attack positioning, and those were different things in a space where the creature could move in any direction without the commitment a human stride implied.
The clicking pattern: rapid grouped bursts meant assessment or approach. The pitch rising meant closing distance. The pattern dropping in frequency meant damage. The silence meant death or imminent attack. He had not yet learned which arrived first on a healthy creature, but silence in the middle of a clicking sequence was the tell he would watch for.
He looked at the metal threading in the joints one more time. The material, the maze's own fibrous walls, threaded through with manufactured metal. He had seen the bridge's traps, which were wood and metal and stone working together, purpose-built. This was something different. This was the maze's own material reshaped into something that hunted.
He knew what he was going to call it.
The Stitch. For the threading stitched through every joint.
He checked the pistol's charge indicator: primary cell at roughly ninety percent. He had spent more than he should have on a first encounter he did not understand. He understood it now. The next one would cost less.
He picked a direction and kept moving.