The seventh Crawler died the same way as the six before it. Walked into Sea of Fire. Froze. Burned. Took a staff to the head. Dropped a spirit material crystal the size of a thumbnail.
Nox picked it up with his good hand and added it to the pouch he'd improvised from a torn sleeve. Seven crystals. Each one worth somewhere between fifty and a hundred credits at the academy exchange, according to the dead boy's fragmentary memories. Call it five hundred credits total, on the low end.
His left arm was wrapped tight in Pang Wei's team's medical bandages. The girl with ice-blue markings had done good work. The bleeding had stopped, the wounds were sealed with spirit-infused adhesive, and the arm was functional enough to grip the staff if he held it close to his body. It wasn't good. But it was operational.
The post-mortem on the shield failure took one paragraph in his notebook:
*Shield crash cause: exceeded D-rank framework capacity (requested 180°, max 90°). Framework terminated the process but constraints persisted. Result: immobilized with no barrier active. Lesson: always test edits below the bounds first, not at or above them. Treat parameter limits like production memory limits. You don't find out you've exceeded them until everything stops working at the worst possible moment.*
He closed the notebook. Moved on. The mistake was documented. Dwelling on it was the emotional equivalent of re-reading a stack trace after you'd already identified the root cause. Waste of cycles.
---
The C-rank zone was a different kind of hunting ground now that he understood Sea of Fire's mechanics.
The skill had a natural rhythm. Activate. Wait. The fire spread in a three-meter radius, burning low and steady, visible enough that anything with survival instincts should avoid it. But Shard Crawlers didn't have survival instincts. They had aggression heuristics. If prey was within detection range, they charged. And charging meant running directly into the fire zone.
First contact: bind. Two seconds of immobility. The Crawler locked in the flames, chitin smoking. Staff strike to the head during those two seconds. If the first strike didn't kill, the sustained burn and thermal damage weakened the target enough that a second strike did.
Average kill time: eight seconds. Energy cost: zero mana. Physical cost: one staff swing. Material reward: one crystal.
It was a farming loop. The same optimization problem he'd solved a hundred times in his old career. Identify the bottleneck (his mana pool), remove it (zero-cost edit), then grind the loop until diminishing returns kicked in.
The diminishing returns came from his body. Each staff swing used physical energy. His Spirit Core regenerated mana, but his muscles didn't regenerate the same way. After the twelfth Crawler, his right arm was shaking. The wounded left arm throbbed with every heartbeat. His shoulders burned from the repeated overhead strikes.
He sat down against a gray-barked tree and counted his haul. Twelve crystals. Plus the seven from before. Nineteen total. Between nine hundred and nineteen hundred credits. Enough to matter. Not enough to feel safe.
A sound from his left. Clicking legs on dirt. He activated Sea of Fire without standing up.
The Crawler came around the tree and hit the fire zone at a full sprint. Bind. Burn. Nox swung the staff one-handed from a seated position. The angle was bad. The strike glanced off the creature's back instead of its head. The bind released. The Crawler lunged.
Nox jammed the butt of the staff into its open mouth. The A-rank wood held. Teeth scraped against the grain but didn't penetrate. The Crawler thrashed, impaled on its own momentum, and Nox twisted the staff sideways. He heard the crack of chitin jaw. The creature went limp.
Twenty crystals.
"I need a better finishing move," he muttered, pulling the staff free. Drool and ichor dripped from the end. "The staff works but it's inconsistent. Sometimes I crack the head, sometimes I don't. Depends on angle, force, whether the thing's moving." He wiped the staff on the dirt. "What I need is a way to make the fire do the killing so I don't have to."
The thought stuck. Sea of Fire did twelve base damage per second. Low. A C-rank Crawler with three hundred HP would take twenty-five seconds to die from fire damage alone, assuming it stood perfectly still in the zone the entire time. Which it wouldn't, because the bind only lasted two seconds on first contact.
But what if the damage was higher? The base damage was twelve. Locked, because he'd used both edit slots on cost reduction and the composite effect. He couldn't add more damage without a third slot, and C-rank skills only had two.
What if the Crawlers were weaker? He couldn't make them weaker. But he could make the fire zone harder to leave. The bind was first-contact only. What if there was a second layer of control? Something environmental.
Nox looked at the terrain. Trees. Roots. Narrow paths between root systems. If he activated Sea of Fire in a chokepoint where the fire filled the entire passage width, a Crawler that hit the bind would be stuck in a corridor of flame with nowhere to go. Even after the bind released, it would have to push through the fire zone to reach him or retreat through fire to escape.
Positioning. The skill couldn't change. But how he used it could.
He spent the next hour finding chokepoints. Narrow gaps between trees. Root corridors. Natural funnels in the terrain. He'd activate Sea of Fire, wait for a Crawler to come through, and let the geometry do half the work.
The results improved immediately. In a two-meter-wide corridor, Sea of Fire's three-meter radius covered wall to wall. A Crawler entering the corridor had no path that didn't go through fire. Bind on entry. Two seconds of burning. Then the creature had to either charge forward through three meters of flame to reach Nox, or retreat through three meters of flame to escape. Either way, six-plus seconds of thermal exposure. With the burn effect ticking on top of that, most Crawlers were at half health by the time they reached him.
One staff strike. Clean kill.
He wrote in his notebook: *Positioning > parameters. A weak skill in a strong position beats a strong skill in a weak position. This is the same principle as good architecture: the framework matters more than any individual function.*
Thirty-one crystals by the time he decided to head back.
---
The walk to the portal took three hours. He stayed in C-rank territory, avoided the boundary markers, and kept Sea of Fire ready but inactive. His spirit power had recovered to about eight points during the farming sessions. The skill didn't cost mana, but his body still burned energy just maintaining the channel. Eight points was enough for maybe one emergency shield activation and a few minutes of fire. Not comfortable, but survivable.
He passed other student teams on the way. Most ignored him. A few stared at the bandaged arm and the blood-spotted uniform. One team, three girls with green sleeve bands, stopped and offered him a healing crystal. He accepted it. The crystal was low-grade, barely C-rank, but it took the edge off the arm pain. He thanked them. They moved on without asking for his name or story. Anonymous kindness from people who assumed he was a casualty of the realm's ordinary dangers.
The portal appeared as a column of blue-white light between the gray trees. Students gathered near it, comparing hauls, counting crystals, congratulating each other on team performances. The atmosphere was post-exam relief. People who'd survived something together and were ready to go back to normal.
Nox stepped through the portal. The cold-water pressure of dimensional transit. The pop in his ears. Then the eastern courtyard of Yuching Spirit Academy, solid stone under his feet and real sunlight on his face.
The registration officer checked him back in. "Solo entry Renn. Duration: forty-one hours. Status: alive." He paused. Looked at the bandages. "Injured."
"Minor."
The officer made a note. "Report to the infirmary for assessment. Academy regulation."
"How long until the review board meets?"
The officer checked his clipboard. "Sixteen hours."
Sixteen hours. Nox had his combat skill. He had credits. He had an arm that mostly worked and a body that desperately wanted sleep.
He also had rules. Real rules, tested in blood. He pulled out the notebook as he walked toward the infirmary and added to the page he'd been building all day:
*COMPILER RULES (confirmed through testing):*
*1. Conservation of Energy: Reducing a parameter requires compensating tradeoff. Bigger reduction = bigger tradeoff. Can trade future potential (cap a parameter permanently) to fund present modification.*
*2. Parameter Bounds: Each skill rank has a framework capacity. Exceeding it causes misfire/crash. D-rank has hard limits on coverage (90° max). Unknown: what are the limits for C, B, A, S?*
*3. Edit Slots: D-rank = 1 slot. C-rank = 2 slots. Higher ranks unknown. Each slot holds one modification (parameter change, constraint, or effect). Composite effects can pack multiple properties into one slot if they share a type.*
*4. Syntax Errors: Conflicting parameters reject. Undefined effects reject. Composite effects need energy source. Failed compilations still cost spiritual energy.*
*5. Compilation Cost: Locking edits requires spiritual energy. Proportional to complexity. Side effects may include physical damage (burns, fatigue). Budget energy for combat AND editing, not one or the other.*
Five rules. Incomplete. Definitely missing edge cases. But it was a working framework. Enough to build on.
---
The infirmary smelled like antiseptic and spirit-infused ointment. A healer unwrapped his arm, clucked at the puncture wounds, and applied a salve that tingled like menthol and needles. Fresh bandages. Instructions to rest.
"The wounds are clean," the healer said. "Whatever field treatment you received was competent. Three days of light activity. No combat."
"I have a review board demonstration tomorrow."
"Then I'd suggest not getting bitten by anything else between now and then."
Nox left the infirmary. It was evening. The campus was quiet. Students who'd returned from the realm were eating dinner or sleeping. The ones who hadn't gone were studying in the library or training in the yards.
He was heading to his dormitory when he passed the central notice board. New postings since the realm opened. Exam schedules. Club announcements. And at the top, in the red-bordered format reserved for administrative actions:
**NOTICE: REVIEW BOARD SESSION — TOMORROW, 0900**
**Student: Nox Renn, Class 3, D-Rank**
**Matter: Enrollment legitimacy review. Vice Dean Lun presiding.**
**Student must demonstrate C-rank combat skill proficiency or face expulsion proceedings.**
**All faculty welcome to observe.**
All faculty welcome to observe. The review board was supposed to be a small panel. Three instructors, Vice Dean Lun, and a records officer. Mira had described it as procedural. But the notice said all faculty welcome. That meant this wasn't procedural anymore. Vice Dean Lun had turned it into a public demonstration.
If Nox failed, everyone would see it. Every instructor. Every student who bothered to show up. The dead-last D-class student exposed as a fraud with forged papers, removed in front of the entire academy.
And if he succeeded, they'd all see that too.
He stared at the notice. His reflection in the glass case was a mess. Bandaged arm. Blood-spotted uniform. Dark circles under his eyes. Glasses slightly bent from being slept on in a tree root hollow.
"All faculty welcome," he said quietly.
He turned away from the board and walked toward the dormitory. He needed sleep. He needed his arm to stop hurting. He needed sixteen hours to pass without anything else going wrong.
Behind him, footsteps. He glanced back.
Pang Wei stood at the other end of the corridor. Arms crossed. Red sleeve band sharp against the gray uniform. His three teammates flanked him, but his attention was on Nox alone.
They looked at each other for five seconds. Pang Wei didn't speak. Didn't approach. Just watched Nox walk away with the kind of focus that said this wasn't finished.
Nox kept walking. The dormitory door closed behind him.
He lay down on his bed. Stared at the ceiling with its water stains and diagonal crack. The same ceiling he'd woken up to three days ago, confused and terrified, in a body that wasn't his.
Three days. He'd died, transmigrated, been attacked, nearly expelled, entered a monster-filled dimension alone, learned a skill nobody wanted, rewritten its code, nearly bled out from his own stupidity, been saved by the person who hated him most, and now had sixteen hours to prepare for a public demonstration that would decide whether he stayed or disappeared.
His old life had never been this tiring. His old life had been twelve years of the same desk, the same monitor, the same coffee, the same forgettable days bleeding into forgettable weeks.
He closed his eyes and was asleep in thirty seconds. The notebook lay open on his chest, ink still drying on the five rules he'd written in blood and fire.
Tomorrow, he'd find out if they were enough.
