The terrain east of the entry point had grown denser.
Not structurally different—the same compressed earth, the same constructed timber treelines, the same grey ceiling holding its flat unchanging light—but the artificial design had layered moisture into this sector with the deliberate intention of someone who had studied what sustained humidity did to a practitioner's focus over time. The air carried the specific thickness of an environment that had been processing water vapor since before the cohort arrived. Each breath held more weight than it should have.
Group 13 moved through it in single file.
Cassiopeia took point. Her boots found the firm ground between the treeline's root clusters with the rhythmic precision of a practitioner who had made a decision about her pace and was executing it without revision. "Ignore the humidity," she said, without looking back. "It's environmental. They want you spending mana on internal regulation. Don't."
"The air is sticking," Seren said. Her fingers traced the faint blue outline of [Barrier]'s idle hum—the instinctive low-level activation of a skill whose user was being asked by her body to do something about conditions it didn't like.
"I said ignore it."
Behind them, Tomlin moved with the mild confidence of someone whose [Reinforcement] made the physical conditions largely irrelevant and knew it. He slowed at a weapon crate half-buried in the earth between two root clusters. "Leader, look. C-rank alloy. If I channel [Reinforcement] through a conductive medium—"
"Dead weight. Move."
Tomlin looked at the crate. Then back at Isaac, who was trailing several paces behind with his hands in his pockets. The specific insufficient allocation. "Well," Tomlin muttered, loud enough to carry. "Someone of my calibre doesn't need to rely on a tool like this. Unlike some others."
Isaac didn't respond. [The Prism] was already running—the moisture content of the humid air, the coverage corridors produced by the treelines' density, the specific dew point of an environment engineered to run at sustained high humidity. Tomlin was a variable in the group's composition. His output was noted and filed.
The mechanical growl came from the treeline before the sound resolved as a direction.
Not a beast. The sound of mana compressed between geometries—the specific signature of a skill-shaped construct operating at the edge of its stability threshold. From the shadow of a dense timber cluster, a wolf-form of hardened mana-mist lunged.
[Mana Mimicry]... Andrias is doing a lot in here. Isaac noted its structural similarity to the delivery bird from the day prior—same underlying construction, different output geometry.
"Contact! Rear-flank!" Seren's hand swept up. [Barrier] snapped to full luminosity—not reflexive, deliberate, the activation of a practitioner who had been holding the skill at idle for exactly this contingency. The construct hit it and found no purchase.
Tomlin caught it at the tail as it recoiled. [Reinforcement] flared—his skin taking on the matte-iron density of the skill at full expression. He drove his closed fist into the construct's chest.
The collision rang metallic. The construct destabilized, its mana coherence breaking. It evaporated into a dispersing cloud of blue vapor.
"What was that?" Seren asked, her breath catching.
"A mimic," Cassiopeia said, watching the vapor disperse. "Master Andrias is receiving mana through D-rank: [Mana Transfer] to fuel them. Low-rank, unpredictable by design. Keep moving."
C-rank: [Reinforcement]. Versatile but limited—defensive rather than offensive at its core. B-rank: [Barrier]. High versatility, constrained by Seren Ashveil's limited combat experience. Isaac filed both without breaking stride.
They broke through a dense cluster of timber growth into a wide clearing where the treelines opened on three sides and the fourth was a natural ridgeline. At the clearing's center, a food crate sat with its single carved mark visible from the approach—the amber pulse of its mana-lit interior steady against the grey diffusion overhead.
The clearing was already occupied.
Three separate clusters of students—twelve in total—were locked in an uncoordinated skirmish that had the quality of exhaustion turning into desperation. D-rankers who had spent too long in the humidity and too long without food, now fighting for the crate with the specific logic of people whose calculations had simplified to the one variable they could still control.
"Step back! This is Group 724's mark!" A boy with his face slick with effort thrust his hands forward. A weak, flickering spark of fire—his skill at low output, the mana pool behind it running shallow. Behind him, two others were trying to build a mud wall that kept sagging under its own weight, the humidity too high for the earth to hold the geometry they were asking it to hold.
To their left, another cluster launched a jagged ice shard toward the fire-user. It wobbled through the thick air, momentum bleeding off before it reached its target.
"Numbers?" Seren called out, stepping to the clearing's edge.
The three-way skirmish stopped. Twelve pairs of bloodshot, exhausted eyes landed on Group 13. They processed Cassiopeia's posture first—the Terra bearing, the unhurried quality of a practitioner whose mana pool hadn't been touched. Then Tomlin's iron-sheened arms.
"Cassiopeia Terra," someone muttered. "Pillar house." Fear and exhausted spite in equal measure. "Don't let them take it! If we don't eat, we're out by the next cycle!"
"Move, or be moved," Cassiopeia said.
"Go to hell!" The fire-spark boy thrust his hands forward. A spray of orange embers hissed through the humid air—unrefined, turbulent, the output of a skill whose user had stopped managing efficiency and was just pushing.
"Tomlin," Cassiopeia said, without raising her hands. "Clear the path."
Tomlin stepped forward with the deliberate gait of someone whose [Reinforcement] had already resolved the question of whether anything in the clearing could hurt him. The fire-sparks struck his chest and arms and dispersed. He didn't adjust his pace.
A D-ranker lunged with a reinforced staff aimed at Tomlin's knee. Tomlin caught it mid-swing. The wood groaned and shattered against his palm. A casual backhand sent the student into the earth.
"Are you even trying?" Tomlin laughed, walking through a flurry of ice shards that broke against his iron-sheened face. He reached the crate, grabbed the lead fire-user by the collar, and deposited him five meters into the treeline's edge.
The remaining students' morale broke. They scattered into the timber with the dispersal of people who had completed a calculation and accepted its outcome.
Tomlin stood over the crate with the expectant attention of someone waiting for acknowledgment. He looked back at Cassiopeia and faltered upon finding she wasn't looking at him. He forced a snort. "D-rank skills and nothing else. They should've surrendered at the start. What's the point of keeping false hope?"
Isaac looked at the treelines where the students had fled. Then at the heavy air they had left behind.
Something is still here.
[The Prism] confirmed it before the thought had fully formed.
[Condensation].
A single standard droplet, fired into the treeline to their rear. The impact produced a quiet, deliberate noise—enough for the group to register it as intentional.
"Leader! Rear!" Seren tensed.
Cassiopeia didn't wait for explanation. She drove her hands into the earth. A granite wall surged upward—the [Bedrock] expression of a Terra practitioner who had been conserving output and was now spending it. Clean, dense, committed.
It held for 0.8 seconds.
Then the mana was inhaled.
The wall de-materialized into dust without fracturing—absorbed, the coherence of its construct stripped away with the specific quality of something that had never needed to break what it could simply take.
"[Mana Siphon]." Cassiopeia's eyes widened. "Vane Abias."
Vane stepped through the dissipating dust with his hand outstretched. He moved without urgency—the particular unhurried quality of a practitioner who had been watching the group's pattern since before they reached the clearing and had selected his moment with the patience of someone who understood that [Mana Siphon]'s advantage wasn't speed. It was inevitability.
"Siphon," he said. He closed the distance to Tomlin in a blur.
Tomlin activated [Reinforcement]. The skill manifested and crumbled in the same instant—the mana construct absorbed before the reinforcement could complete its settling, Vane's proximity converting Tomlin's own skill into fuel.
Seren moved, angling to put [Barrier] between Vane and Tomlin. She was redirected by sharp needles from Vane's second teammate—C-rank: [Poisonous Sting] forcing her to cover herself and Cassiopeia rather than Tomlin.
Cassiopeia stomped her foot. A metallic pole erupted from the earth ahead of Vane with lateral momentum. [Ferrous Bind]—fast, committed.
Vane's eyes shifted. The pole crumbled before contact—absorbed by [Mana Siphon] in the same motion, Cassiopeia's contribution eliminated before it became a contact event.
"[Gravity Field], successful."
Cassiopeia and Seren wobbled. Vane's third teammate had positioned himself at their rear—both hands clasped, a circle twenty meters in radius drawn around the two girls, the gravity inside it amplified to a degree that made standing feel like the beginning of a sustained effort.
Tomlin attempted [Reinforcement] again. Vane absorbed it again. The absorption wasn't requiring effort.
"Too late, Greave." Vane placed his palm in front of Tomlin. Pure mana—the raw output of a practitioner whose pool had been supplemented by everything it had absorbed in this clearing—slammed into Tomlin and sent him into the treeline. The kinetic force registered on the device. White light. Tomlin was gone.
B-rank: [Mana Siphon]. C-rank: [Mana Pressure]. Vane Abias—leading figure of Group 12. Isaac filed both.
The dispersal of the combat had put Isaac twenty meters from Vane's fourth teammate—a boy whose visible relief at the separation from the main engagement registered clearly at the distance.
Poisonous needle—C-rank: [Poisonous Sting]. Nothing Seren's [Barrier] couldn't hold under normal conditions. But Vane's [Mana Siphon] passive made Seren's skill unstable at proximity. The [Gravity Field] was adding to the girls' difficulty. The fourth member was a containment function—present to hold Isaac's attention while the real work concluded at the clearing's center.
"Bad luck, right?" The boy formed a droplet that wobbled and fell to the earth. "Vane told me to keep you occupied. No point in people like us getting hurt, right?"
His mana flow was a leaking, turbulent mess. The inefficiency was visible from where Isaac stood.
"Isaac, Nameless. I know you. Everyone knows you. Guess what? I own the same F-rank: [Condensation]. This skill is absolutely useless!" The boy gritted his teeth and pointed his finger upward. A drop of water formed and fell. That was the extent of it. "Unless you want a fistfight, there's no point. This is team-based anyway. The best that we can do—"
Isaac raised his hand.
[Condensation].
The dense droplet—compressed to the density of lead—struck the boy's wristband threshold before the sentence finished. White light. Gone.
Isaac turned to the clearing.
"Seren, hold the left!" Cassiopeia had one knee to the earth under the [Gravity Field]'s amplification, her armor carrying a weight it hadn't been built to carry.
Seren's leg had taken a [Poisonous Sting] that had slipped through [Barrier]'s flicker during Vane's proximity neutralization. The barrier was shrinking—Vane's passive pulling at its construct from ten meters out.
"I can't hold it, Leader!" The report of someone arriving at a fact they hadn't wanted to reach.
Isaac moved forward. No announcement. Cassiopeia caught the movement—her eyes narrowed for one moment before returning to the immediate threat.
[Condensation].
A single standard droplet fell to the earth—one second before the [Poisonous Sting] user stepped on the precise position where the surface friction had been altered. She slipped. The [Poisonous Sting] volley missed Cassiopeia and Seren entirely, its trajectory broken by the loss of its user's footing.
Vane's attention pulled for 0.4 seconds—the involuntary perception shift of someone whose formation had just deviated from its expected pattern.
"Now."
Cassiopeia drove her hands into the earth. [Bedrock]—not defensive this time, lateral, the ground beneath the two girls surging upward as a rising platform that carried them out of the [Gravity Field] circle's boundary.
[Condensation].
Isaac's dense droplet struck the [Gravity Field] user at the same moment. White light. Gone.
"What—"
Vane turned toward where his teammate had been. His eyes tracked to Isaac. "You."
"Vane!"
A third round of [Poisonous Sting] fired toward Cassiopeia and Seren. Vane refocused—[Mana Siphon] passive reorienting toward Cassiopeia's next output. She fired projectiles. He absorbed them in motion, closing distance.
Then he slipped.
The film of deionized water between his last position and the girls had no ionic content and a friction coefficient the compressed earth's surface hadn't been designed to maintain. Vane's body made the automatic adjustment—the partial recovery of a practitioner whose physical training was real but whose attention had been allocated to the mana threat rather than the ground threat.
The partial recovery was enough for Cassiopeia's boulder to find its mark.
He absorbed most of it mid-strike—the [Mana Siphon] passive catching the skill's construct even as the physical impact carried through. He was knocked away regardless.
"[Ferrous Bind]."
Metallic poles erupted from the earth around the [Poisonous Sting] girl. They bent and coiled, wrapping before she could redirect. Seren's [Barrier] caught the final needle volley.
[Condensation].
The dense droplet found the girl's temple. Device registered. White light.
Vane—injured, wristband intact, calculation complete—withdrew into the treeline. He left the crate. His eyes held on Isaac for one moment as he went, with the specific quality of someone revising a filed entry at significant cost.
The clearing went quiet.
Seren was gasping, clutching her leg. "We won. Close, but we won."
Cassiopeia brushed the earth from her knees and walked to the clearing's rear. She stopped in front of Isaac, who was standing with his hands in his pockets looking at the moss on a nearby root cluster.
"The slip," she said, voice low. "You didn't just make water. You changed the friction coefficient of the entire surface area. The thin film—the precision that F-rank: [Condensation] shouldn't be capable of."
Isaac looked up. His eyes met hers.
"How?" Low enough that Seren couldn't hear it. "How does an F-rank skill achieve that kind of density in a high-pressure environment?"
"The environment is unusually humid. [Gravity Field] amplified it further. All I needed was to provide a slight tip-over."
"That doesn't explain the precision."
"Calculation. What else can it be?"
Cassiopeia looked at him for a long moment. She realized then that her notes on Isaac weren't incomplete in the sense of missing data—they were incomplete in the sense of having been built on a miscategorization. He wasn't a useful addition to the group. He was the only person in the clearing who had understood the physics of what they were in.
"Leader?" Seren called out, limping toward them. "The crate..."
"Take the rations," Cassiopeia said, without looking away from Isaac. "We move in five minutes."