Sylas waited until well past midnight.

  The gymnasium had reached its version of quiet — which was not actually quiet, but was as quiet as eighty people in a cold stone space with at least a dozen respiratory infections between them ever became. Coughing broke the near-silence in irregular bursts: one student, then another, then a cluster of three in succession before the room settled back to the sounds of restless sleep. Shifting against hard mats. The particular shallow breathing of people who were either sick or had given up on deep sleep as an ambition.

  He had been lying awake for hours, counting time in heartbeats and coughs and the occasional sound from outside. Too early and someone might still be awake, might see him leaving, might ask a question he was not positioned to answer. Too late and he risked the early-rising staff who began preparing the Academy for the day while most of it still slept.

  Arthur lay on his mat beside Sylas, fever-hot and restless even in sleep. He shifted every few minutes, murmured things that resolved into nothing when Sylas listened for them, occasionally startled back toward waking before subsiding again. The rattle in his lungs was audible in the quiet — not loud, but present, the consistent sound of a respiratory system that was managing rather than functioning. Sylas had checked on him twice in the last hour. Still burning. The rattle unchanged.

  This was for Arthur. And for Mae, whose confidence had been visibly eroding under the weight of conditions nobody should be trying to pass an examination through. For Jin, who looked more hollowed out each time Sylas saw him. For Kara, who had been holding herself together for days by a thread that was fraying. For all the students getting sicker by the hour in this stone gymnasium that had never been designed to be anyone's home.

  That was what Sylas told himself as he carefully extracted himself from his blanket and gathered his things. Not because he imagined himself as someone who fixed things heroically. Not because he believed a single rune on a single beam was going to solve anything fundamental about the situation. Just because he had the knowledge and the capability, and watching people suffer in conditions you could improve with a night's work was its own kind of choice.

  He had prepared during the afternoon, using a library errand as cover. The Academy workshop — technically reserved for advanced students working on cultivation equipment — had a lock that was more symbolic than functional, designed to discourage casual entry rather than prevent determined access. A basic application of mana to the mechanism, the kind of thing any competent cultivator could manage, and the door had opened.

  Breaking in had added itself to the growing inventory of compromises he had been maintaining since his first day in this situation. He had rationalised it with the same quality of reasoning he applied to the other compromises: the tools were unused, the workshop inventory was extensive, he would return everything undamaged before anyone checked, the distinction between borrowing and stealing was a matter of intent and duration and the absence of intent to deprive. The rationalisation had approximately the structural integrity of his previous dormitory ceiling. He noted this and kept it anyway, because the alternative was not going, and not going was its own kind of rationalisation dressed as principle.

  The workshop had been full of things he had wanted to examine properly — formation arrays at various stages of completion, testing devices whose function he could guess at but not confirm, materials he could identify by their properties if not their names. He had stayed focused. Taken only what the repair required.

  A small carving tool with a tungsten tip, for precision work on hardened surfaces. A vial of conductive paste — the expensive kind, enhanced with powdered spirit stone, used to restore energy flow in formations whose carved channels had degraded below functional depth. A brass-bristled wire brush that would clean without scratching. A chalk stick for marking reference points. Standard materials for anyone working with runic formations. Nothing that would be noted missing from the workshop's extensive inventory.

  He had also taken a dark cloth to wrap over his clothes. Not a disguise, exactly — if anyone saw him at this hour they would have questions regardless of what he was wearing — but a reduction in visibility in the event that someone glanced across the courtyard without specifically looking.

  He retrieved the tools from under his mat, wrapped the satchel closed, and made his way to the gymnasium entrance with the careful quiet of someone navigating a shared space in the dark. The mat near the door belonged to a student who had shifted onto his side and was breathing with the deep regularity of genuinely unconscious sleep. Sylas stepped over his feet, tested the door handle slowly, and pushed.

  The hinges produced a small sound — not loud, but distinct in the near-silence. He stopped, held still, counted seconds. Nobody stirred. The gymnasium's ambient night-noise continued: a cough from the far end, the soft sound of someone shifting on a mat, the building's own faint commentary on the cold. He waited another ten seconds and slipped outside.

  Outside, the Academy grounds held the specific quality of late-night emptiness — no one present, but traces of the day still visible in disturbed dirt and left items, as though people had only recently been absent. A thin moon provided light enough to navigate by. The dormitory stood across the courtyard, darker than the sky behind it, its damaged profile visible even in low light.

  Sylas walked at a pace he had thought about: purposeful enough to suggest a destination if observed, unhurried enough to not suggest urgency. If someone saw him, he was a student who could not sleep, taking air. The satchel at his side was personal belongings. Nothing unusual.

  The dormitory entrance stood open — the door had been damaged during the evacuation and never properly secured afterward. The building was supposedly being repaired; securing the entrance had apparently not been prioritised. Sylas slipped inside.

  The hallway had been pumped out, leaving mud and debris that had dried to a dark crust on the stone floor. The smell was the compound smell of rot and mineral deposit and the specific sourness of wood that had been saturated and was now drying unevenly. Emergency lights ran along the walls at intervals, yellow-orange, enough to move by without a lamp. The temporary support beams the workers had installed were crude in the way of things built under time pressure by people who understood function better than aesthetics — thick wooden posts propped at load-bearing angles, doing their job without elegance.

  He found the collapsed beam where he had left it in his memory — or rather, where it had been stabilised, leaned against the temporary supports at the angle of its failure, the crack running deep through its width. The workers had done what they could with it. The assessment remained: the beam needed replacement, not repair. What needed repair was not the beam.

  Sylas crouched and examined the maintenance rune with his analytical sight, close up now rather than from the hallway entrance. The formation was even more comprehensively degraded than it had appeared from a distance. The seventeen-point network was barely a suggestion under the accumulated decades — water deposits filling the channels, mold colonising the lower grooves where moisture collected, the upper symbols worn to shallow impressions by the same slow erosion that had taken the beam's strength.

  Of the seventeen connection points, five retained enough depth to be workable. The others had been smoothed to ineffective shallowness by time and water and the particular patience that neglect brought to its work. The central gathering node was cracked straight through — a fracture that was older than the recent collapse, an injury that had probably compromised the formation years ago and had been accumulating mineral deposit in the gap ever since.

  He could not fix the crack. Could not restore the five worn points. Could not make this formation what it had been when it was carved. What he could do was work with what remained — clean the salvageable channels, carve a bypass pathway around the damaged central node using two smaller gathering points on either side of the crack, apply conductive paste to compensate for the reduced channel depth. Not elegant. Not the original design. Functional enough.

  If you discover this tale on Amazon, be aware that it has been unlawfully taken from Royal Road. Please report it.

  He set down his satchel and pulled out the wire brush.

  The cleaning took longer than he had estimated — the accumulation in the channels was multi-layered in the way that decades of neglect produced, each layer requiring its own approach. The hard mineral deposit at the bottom needed careful work with the brush's edge. The organic material above it came away more easily but required complete removal or it would continue degrading the channels beneath it. The surface grime on top was the easiest and least important layer.

  He worked methodically, section by section, checking each cleared channel with his analytical sight before moving to the next. The carved grooves emerged from under the buildup in the way that buried things emerged when properly excavated — shallower than they had been originally, their edges softened by years of water and deposit, but present and workable. The process had a quality he recognised from his previous life's version of careful work: the specific satisfaction of a system responding to attention, yielding up its structure as the obstructions were removed.

  The twelve surviving connection points were recoverable. He finished the cleaning and set down the brush.

  This was where the problem asserted itself.

  He had intended to work carefully, with deliberate hesitation, producing the kind of slightly uneven cuts that suggested someone working from memory rather than expertise. His hands had other intentions. They moved with the automatic precision of someone whose analytical mind had been solving optimization problems for a month and had apparently generalised the skill to physical execution. The carving tool found the correct angle before his conscious mind finished specifying it. The bypass pathway took shape with a smoothness that he had not planned.

  He tried to introduce error. Made a conscious effort to hesitate at decision points, to use slightly the wrong angle, to produce the kind of small uncertainties that would read in the finished work as someone operating from knowledge rather than expertise. His hands cooperated for approximately ten seconds and then returned to what they apparently considered the correct way to do this, the optimization instinct overriding the deliberate degradation with the serene authority of a system correcting for an input it had identified as counterproductive.

  He stopped, looked at his hands, and made a second attempt at deliberate imprecision. His hands looked back at him, metaphorically, and continued being precise.

  It was like trying to write illegibly when you had spent years developing good handwriting. Possible in principle, requiring more concentration than writing legibly, and in direct competition with the task that actually needed the concentration. His mind was solving the formation problem. It would not simultaneously solve the problem of making the solution look worse than it was. He did not have the spare capacity.

  The bypass pathway was complete in five minutes. What should have taken a student working from partial knowledge at least half an hour, probably longer. Sylas looked at what his hands had produced and recognised the problem clearly.

  The work was expert. Not approximately expert, not competent-for-an-amateur — expert in the way that left specific signatures for anyone who knew what they were looking at. The channel depths were optimized for flow. The angles minimized resistance. The gathering nodes were positioned at exactly the points that would balance the load across the surviving connection points most efficiently. Every decision that a practitioner with real formation knowledge would make was present in the work.

  It was too late to undo it. And it might not matter — the workers did not know about runes, and the instructors had not inspected these formations in decades. But the awareness of it sat in his chest as he moved to the weathering stage.

  He used the wire brush to rough the new carvings' edges, introducing the irregular texture that age produced. Worked dirt into the channels until they read as old rather than recent. It was imperfect falsification — someone looking closely with adequate knowledge would notice that the weathering did not match the depth of the cuts. But in poor lighting, in a building that no one had properly inspected in thirty years, it might be sufficient.

  The conductive paste was the final step. He opened the vial and applied it with the edge of his carving tool — sparingly, a thin layer along each cleaned pathway, slightly more at the improvised gathering nodes. The paste was thick and faintly luminescent even at rest. Too much would cause the pathways to glow visibly when mana moved through them, which was not a characteristic that an old degraded rune was supposed to have.

  His hands applied it in exactly the right amounts.

  He stepped back and looked at the completed repair. The formation read as functional to his analytical sight — not at anything approaching the original capacity a full seventeen-node network in good condition would provide, but at enough. His estimate was thirty to thirty-five percent of original reinforcement strength: enough to meaningfully share the load with new timber rather than leaving it to bear alone, enough to shift the beam from operating significantly beyond its design parameters to operating within them. Combined with fresh wood that had not accumulated decades of stress, it would be adequate. The building would stabilise. Students would return to their rooms. Arthur would sleep somewhere with a roof that was not actively trying to fail.

  Fifteen minutes total. He checked the figure against his sense of elapsed time and confirmed it: fifteen minutes for a repair that should have taken an hour minimum, probably two, for someone doing it without the kind of automatic optimization that his mind had apparently been developing quietly alongside everything else.

  He cleaned the area — wood shavings swept aside, paste drops removed, footprints in the mud obscured as well as the poor lighting allowed — and gathered his tools back into the satchel. One last look at the formation. The weathering was imperfect. The new channels were too precise for thirty-year-old work. But in bad light, to someone who had not been looking for it, it read as a degraded rune that retained partial function. Plausible enough.

  He made his way back through the dormitory with the specific lightness of someone who has finished a task they were not certain they could complete. The emergency lights cast his shadow at varied angles as he moved. The building groaned softly — the structural voice of a building adjusting to its supports, familiar now, no longer alarming.

  Tomorrow the workers would return. They would install the replacement beam. The rune would provide reinforcement it should not technically have been able to provide, given its visible state of degradation. The beam would hold better than expected. The building's stability would improve. Engineers would attribute it to the quality of their temporary work, to good timber, to whatever explanation required the least additional investigation.

  Nobody would question it. Why would they? The building was getting better. Engineers would attribute the improved stability to the quality of their temporary bracing, to the soundness of the new timber they planned to install, to the natural improvement that came from proper structural intervention. That was the thing about invisible causes: when the visible effects were positive, no one looked for other explanations. The temporary supports were holding better than expected — good. Move on. Next problem.

  He slipped back out into the cool night air and crossed the courtyard to the gymnasium without encountering anyone. The Academy slept. He returned to his mat, stowed his tools, and lay down in the dark.

  Arthur's breathing beside him was still laboured, still rattling with the specific quality of fluid in the lower airways that he had been hearing for two days. That would not resolve tonight. But in a day, maybe two, after the workers installed the beam and the building was assessed and the Academy concluded that re-occupation was permissible, Arthur would be back in his room. An actual bed. Warmth that did not require constant maintenance of a blanket arrangement. Dry air. The conditions in which fevers broke rather than deepened. The rattle would resolve once the conditions for resolving it were present.

  Sylas closed his eyes.

  Done, he thought. Crisis averted. Nobody will know.

  He had helped. Fixed something. Made a difference without exposing himself — or so he believed, lying in the dark with the accomplished feeling of someone who had navigated a difficult problem and emerged intact.

  It never occurred to him that expert-level work leaves expert-level traces. That precision has a signature that persists in the material it is applied to. That someone with the right knowledge, examining the formation in good light, would see not a degraded rune that had retained partial function but a degraded rune that had been partially restored — and would know the difference between those two things.

  It never occurred to him that the Academy might have reasons to monitor the dormitory more carefully than he had assumed, particularly after a structural failure that had displaced eighty students two days before a scheduled examination.

  Or that someone might already be looking.

  He slept, satisfied with the night's work, running through the examination targets one final time as exhaustion claimed him — thirty-four percent overall, sixty on the written, five minutes exactly on practical — unaware that the night's other work had already been observed, and that what he had left behind in the dormitory was not invisible at all.