The Archmage Became A Mushroom Tamer

Chapter 4

Chapter 4 · 1,835 words

## Ch004 - The Cracked Cup Protocol

Three days into the cultivation, the drainage pipe culture was thriving.

Aldric had established a nutrient gradient that forced the mycelium to evolve thermal storage capabilities. High-phosphorus waste from the dining hall, scavenged from the compost bins behind the kitchens and carried back in a discarded wrapping, fed one side of the culture. Carbon-rich cellulose from discarded packaging fed the other. The mycelium, to bridge the gradient, had to develop the ability to store and transport thermal energy. Without it, the temperature differential between the two nutrient sources would kill the colony.

He named the developing strain: Fireball Zero, prototype.

The work was painstaking. Every mana pulse had to be precise. The mycelium responded to structured mana flow the way a circuit responded to current: it followed the paths he created, grew in the patterns he designed. But the margin for error was razor-thin. One wrong gesture, one misaligned pulse, and the culture would die.

He worked on his hands and knees in the drainage pipe access, his fingers drawing formation geometry on the dormitory floor. The gestures were old spell-casting patterns repurposed, the thermal circulation formation, adapted for biological substrate. In his old world, this formation had been used to distribute heat evenly across a ward's surface. Here, it served a different purpose: guiding the mycelium's growth into a spiral pattern that maximized thermal retention. As his fingers traced the outer ring, a flicker of something surfaced in his mind. A half-memory of a different context, a larger scale, the formation doing something that felt like it reached *between* something. Between realms? Between layers? The thought dissolved before he could examine it, the way half-formed insights always did when you tried to pin them down. He shook it off and continued.

The mycelium responded, its growth patterns shifting to match the geometry. Threads that had been growing randomly began to align, forming the spiral channels that would serve as thermal storage conduits.

It was impossibly delicate. It was exhausting. His mana, already limited, was stretched thin by the constant micro-adjustments. His hands shook. His vision blurred. His new body wasn't used to this kind of sustained mana expenditure, and it complained in ways his old body never had, headaches, fatigue, a persistent ache behind his eyes that reminded him of the gap between what he knew and what he could do.

But it was working.

Fireball Zero was developing thermal storage vacuoles, tiny pockets within the mycelial structure that could absorb and retain heat. The efficiency was low, perhaps twelve percent of what he'd achieved in his old world, but it was a start.

He was adjusting the mana flow when the alert triggered.

A sharp pulse from his mana-monitoring bracelet, the standard-issue device every student wore, designed to detect unauthorized mana use in the dormitories. The bracelet was warm against his wrist, its surface glowing faintly blue. Then amber. Then a rapid pulse of orange.

Mana fluctuation. Significant enough to trigger an alert.

He had seconds.

The dormitory supervisors would be there within a minute. Two B-tier students assigned to patrol the F-tier wing, tasked with maintaining order and detecting violations. If they found the cultivation, if they traced the mana signature to the drainage pipe, the culture would be destroyed. The bureaucratic reflex to shut down "unauthorized biological cultivation" was stronger than curiosity. The academy didn't tolerate unscheduled organic growth in residential zones. The rules were clear. The penalty was expulsion.

He couldn't let that happen. Not yet. The culture was too early-stage to defend or explain. If they found it, they wouldn't ask questions. They'd scrape it out of the pipes and incinerate it.

He made a decision.

He channeled mana into his monitoring bracelet. Not a lot, he couldn't afford to waste much, but enough. He shaped the mana into a specific pattern, a false reading that mimicked a malfunctioning mana conduit in the wall. The pattern was borrowed from his old world's diagnostic spells, a way to create a signal that looked like infrastructure failure rather than unauthorized use. It required precise control, a level of mana manipulation that an F-tier student shouldn't possess. But the bracelet couldn't tell him that. It could only read the signal he fed it.

The bracelet's glow shifted from orange to amber. *Warning: mana conduit malfunction detected in wall section F-17.*

The supervisors arrived. Two B-tier students, their expressions bored. They'd been expecting an F-tier doing something stupid, unauthorized cultivation most likely, or perhaps a fight. They weren't expecting a maintenance issue.

"Mana fluctuation alert," one of them said, looking at his own bracelet. "Source?"

Aldric held up his wrist. The bracelet was glowing amber. "Conduit malfunction. Section F-17. I've been trying to reset it for an hour."

The supervisor checked the wall. The mana conduits were old, the infrastructure aging. A malfunction wasn't unusual. The F-tier dormitory was the oldest building on campus, and its magical infrastructure hadn't been updated in decades. He pressed his palm against the conduit, ran a diagnostic, found nothing, because there was nothing to find. The malfunction was in the bracelet, not the wall. But the diagnostic couldn't distinguish between a wall malfunction and a bracelet malfunction. Both produced the same signal.

"Building's getting old," the supervisor muttered. He made a note on his tablet. "I'll file a maintenance request. Try to avoid using mana near that section until it's checked."

They left.

Aldric sat on the floor, his hands shaking. The false reading had burned nearly twenty percent of his available mana. He could feel the exhaustion, a hollow feeling behind his eyes, a slight tremor in his fingers, the kind of bone-deep weariness that came from pushing a limited resource beyond its comfortable margin.

He couldn't afford to do that again. Not here. Not in the dormitory.

The cultivation was too risky. The dormitory's mana-monitoring infrastructure was too sensitive, the supervisors too diligent. He needed to move the culture. Or find a way to shield the mana signature.

He didn't have the mana to shield it. And moving the culture risked destroying it.

He was trapped.

He went to the dining hall. He hadn't eaten in hours, and his body, the new body, the weak body, was beginning to complain in ways he couldn't ignore. Hunger, fatigue, the persistent ache of mana depletion. He ate alone, as he always did, at a table in the corner where no one else sat. The food was adequate. Bread, stew, a piece of fruit. He ate quickly, mechanically, his mind already working on the problem of the cultivation.

Cass Wren found him there.

The E-tier Herbalist was carrying a tray of plant samples, herbs, mostly, with a few fungal specimens that had probably been misfiled. He was collecting samples for his Herbalism coursework, the kind of busywork that kept E-tier students occupied while the real students did real work. His tray was overloaded, his fingers stained green from plant sap.

Cass spotted Aldric. His face lit up with the eager, nervous smile of someone who'd been looking for an excuse to talk.

"Sorry," he said, nearly dropping his tray as he approached. "I didn't, um, are you sitting here? I mean, I can sit here, right? It's a common table."

Aldric looked at him. "It's a common table."

"Right. Yeah." Cass sat. He arranged his samples with the careful precision of someone who'd been told many times that his work mattered, even if no one else thought so. "I'm Cass. E-tier Herbalist. I, uh, I saw you at the ceremony."

Aldric ate. He didn't respond.

Cass wasn't deterred. Or rather, he was deterred, but his loneliness was stronger than his deterrence. "I noticed your fingers." He gestured vaguely at Aldric's hands. "They're stained. With substrate, I think. Mycelial substrate. I've seen it before, in the greenhouse, when we're working with fungal cultures."

Aldric kept eating.

"You're cultivating something," Cass said. It wasn't accusatory. It was curious, the curiosity of someone who genuinely wanted to know, not someone looking for leverage. "I won't tell anyone." He paused, his cheerfulness faltering for a moment. "But if you ever need someone who knows about nutrient substrates, I'm an E-tier Herbalist. I know things about plant chemistry that the B-tier students ignore. Nutrient ratios, contamination control, growth acceleration. I'm good at it. Probably the only thing I'm good at." He leaned forward slightly, lowering his voice. "I've also noticed things. About the greenhouse. The old foundations underneath, the stone down there is different, older. And the specimens they keep in the basement level? They grow faster than they should. Nobody talks about it, but I've measured it. Thirty percent faster growth on the lowest shelf, closest to the foundation stone." He caught himself, straightened up, and fumbled with his tray. "Sorry. That's, I talk too much. It's just, nobody else cares about the weird stuff."

Aldric set down his fork. He looked at Cass. He looked at him the way he'd once looked at promising students, with the detached evaluation of someone trying to decide whether the person was worth the investment.

Cass was eager. He was lonely. He was willing to help an F-tier despite the social cost. His motivation was probably desperation, the kind of desperation that made people cling to anyone who acknowledged their existence. But beneath the desperation, there was something else. Competence. Cass knew about mycelial substrate. He knew about nutrient ratios and contamination control. He had skills that Aldric could use.

Useful. But not yet trustworthy.

Aldric stood. He picked up his tray. He walked away without responding.

But he remembered.

That night, he dreamed.

He was standing in a vast underground cathedral. The walls were made of interlocking mycelial threads, alive, pulsing with soft blue light. The threads stretched upward, forming arches and vaults, creating a space that was both biological and architectural. The air smelled of earth and rain and something old, old beyond measure, old in the way that stone is old, in the way that the space between stars is old.

The threads pulsed in sequence, like a heartbeat. Like a signal traveling along a nerve. The light moved through them in waves, illuminating patterns that were too complex to follow, too vast to comprehend.

A voice spoke. Not a voice. A pattern. A vibration in the mycelial network that his mind interpreted as words because his mind needed words to make sense of what it was experiencing.

*"You are late."*

He woke gasping.

His Mycelial Bond skill was active. He hadn't triggered it. The connection was faint, but present: a thread linking him to something beneath the academy. Something that had been there before he arrived. Something that had been waiting.

He checked the drainage pipe culture.

It had tripled in size overnight.

Something had fed it while he slept.