Chapter 15: The Catalyst of Growth
The subterranean training cavern echoed with the relentless sounds of destruction.
Lyla’s hammer shattered stone pillars with deafening cracks. Kira was a silver blur, her silk suit whistling as she broke the sound barrier, slicing practice dummies to ribbons. Elara stood in the center, rapidly deploying angled carbon-stone ramps to deflect a barrage of high-velocity clay pigeons Ren was launching from a customized, mana-powered pitching machine.
They had been at it for three hours. They were magnificent, precise, and deadly.
And yet, Ren sat on his obsidian bench, his chin resting on his hands, looking profoundly unsatisfied.
He held up a hand. The pitching machine powered down. "Stop."
The girls froze instantly. Panting heavily, they converged on the bench, dripping with sweat despite the breathable silk under their uniforms.
"Did we do something wrong, Master Ren?" Lyla asked nervously, resting her three-hundred-pound hammer on the floor as if it weighed nothing.
"You are doing exactly what I taught you," Ren said, standing up and pulling three chilled bottles of electrolyte water from a magically cooled chest. He handed one to each of them. "Which means you have reached the physical limits of your current biological output. Kira, your muscles are tearing faster than my hot spring can heal them. Elara, your mana reserves are dropping by thirty percent in prolonged engagements. Lyla, your swings are powerful, but your recovery time between strikes is point-eight seconds too slow."
Elara wiped her mouth, her brow furrowing. "But Ren, we've leveled up. Our stats are higher than most Royal Knights."
"Stats are just numbers the System assigns to raw potential," Ren dismissed, waving his hand. "We are going to stop relying on raw potential. We are going to optimize your internal circuitry."
Ren walked over to the black chalkboard he had set up near the baths. He picked up a piece of chalk and drew a crude outline of a human body, focusing on the brain and the spine.
"Kira," Ren began, pointing to the drawing. "When you decide to run, your brain sends a signal down your spinal cord to your legs. That signal is a tiny electrical impulse. No matter how high your Agility stat goes, you are fundamentally bottlenecked by the biological resistance of your own nervous system."
Kira’s silver ears twitched. "Can... can we make the signal faster?"
"We can eliminate the resistance entirely," Ren smiled, his eyes lighting up with the thrill of applied science. He tapped the board. "I am going to teach you the fundamentals of electromagnetic theory. You are going to take a microscopic layer of your ambient mana and wrap it around your central nervous system. By aligning the magnetic poles of your mana along your nerve pathways, you will create a superconducting field. The electrical signals from your brain won't have to push through biological tissue; they will ride the magnetic field instantly. You won't just move fast, Kira. You will move at the exact speed of thought."
Kira’s amber eyes widened in awe.
Ren turned to Elara and Lyla. He erased the body and drew a complex graph with a center line and two fluctuating lines above and below it.
"For you two, the issue is endurance and predictive efficiency," Ren lectured. "In battle, you are guessing how much mana or physical force to use for each block or swing. You are wasting energy on overkill. From now on, you will apply statistical process control to your combat."
Elara squinted at the graph. "Statistical... what?"
"Data management," Ren explained smoothly. "I want you to treat every incoming attack as a data point. Elara, when a monster strikes your barrier, your mind must instantly calculate the kinetic force and establish a baseline median. Map the variance of the enemy's strikes. You will define an upper control limit and a lower control limit. Stop fighting based on instinct. You will only expend extra mana to thicken your barrier when an attack mathematically exceeds your established upper control limit."
If you come across this story on Amazon, it's taken without permission from the author. Report it.
He looked at Lyla. "The same for your hammer. Establish a mean average of force required to shatter a specific density of armor. Do not swing at maximum power every time. Use the exact statistical output required. No more, no less."
The cavern fell completely silent.
What Ren was asking them to do was insane. He wasn't asking them to hit harder. He was asking an eight-year-old maid, a five-year-old fox-kin, and a fourteen-year-old cow-girl to run complex, real-time data analytics and manipulate their own electromagnetic fields in the middle of high-speed combat.
Elara looked at the graph. She looked at Ren’s absolute, unwavering confidence in them.
"We will need to map the variables first," Elara said quietly, her sharp mind already trying to grasp the concept of establishing control limits.
"Exactly," Ren beamed proudly. "Assume your positions. We are going to run the data."
The next two hours were the most agonizing training of their lives. It wasn't physical strain; it was the intense, crushing mental weight of forcing their minds to process the world not as a battlefield, but as a flowing stream of mathematics and physics.
Kira collapsed first, clutching her head as she tried to force her mana to align its polarity along her spine. Lyla missed her target completely, her brain freezing as she tried to calculate the median density of the stone.
But Ren was there. He didn't yell. He walked among them, offering gentle corrections, wiping their brows, feeding them pieces of high-sugar candied fruit to keep their brains functioning, and whispering the equations until they became a rhythm in their minds.
And then, it happened.
Kira was the first to break through. She closed her eyes. Instead of the chaotic, bursting aura of a beast-kin, her mana suddenly snapped tightly against her skin, humming with a low, terrifyingly stable electrical vibration.
A clay pigeon launched from the machine at three hundred miles per hour.
Kira didn't blur. She simply appeared at the end of the cavern, the clay pigeon cleanly sliced in half, resting perfectly on her dagger. She had moved before her muscles had even fully registered the command to jump.
A second later, Elara and Lyla found their rhythm. Lyla’s swings stopped sounding like explosions and started sounding like precise, surgical gunshots—expending the exact kinetic force needed to crack the stone without a single ounce of wasted follow-through. Elara’s barriers thinned to the width of a razor, fluctuating in thickness in real-time, predicting the exact moment of impact based on the velocity data of the incoming projectiles.
Suddenly, a loud, piercing SCREECH echoed not in the cavern, but in their minds.
Ren stepped back as three massive, translucent blue Skill Panels forcefully materialized in the air in front of the girls.
The panels weren't updating. They were glitching. The blue light violently fractured, flashing a deep, urgent red, before shattering entirely into a blinding, majestic gold.
The planetary System couldn't comprehend what was happening. It was a program designed to track simple magical growth, but these three subjects had bypassed the system's core logic. They were running advanced algorithmic processing and localized electromagnetic manipulation.
The System had no choice but to force an evolution to categorize the anomaly.
[SYSTEM OVERRIDE: Sector 4]
[Subject: Kira]
[Logic Error... Resolving...]
[Class Unlocked: Neural-Kinetic Assassin (Mythic)]
[Unique Trait Acquired: Electromagnetic Superconductivity]
[Subject: Elara]
[Logic Error... Resolving...]
[Class Unlocked: Aegis of Variance (Mythic)]
[Unique Trait Acquired: Statistical Probability Mapping]
[Subject: Lyla]
[Logic Error... Resolving...]
[Class Unlocked: Gravimetric Juggernaut (Mythic)]
[Unique Trait Acquired: Absolute Mass Output]
The golden light faded.
The girls stood frozen, staring at the impossible, Mythic-tier classes floating before their eyes. In the history of Aethelgard, Mythic classes were the stuff of legends, bestowed by gods to Heroes.
They had just earned them through applied mathematics.
Elara’s knees finally gave out. The intense mental processing dropped her into a deep exhaustion. Before she could hit the stone floor, Ren was there, catching her gently in his arms. Kira and Lyla immediately slumped down beside them, their bodies completely spent.
"You did it," Ren whispered, his voice thick with overwhelming pride. He looked at the three girls who were rapidly becoming the most dangerous beings on the continent. "You are perfect."
"Master Ren..." Lyla mumbled, her eyes heavy. "My brain hurts."
"I know, Lyla. I know." Ren gently scooped Elara up into his arms, gesturing for Lyla and Kira to follow. "Training is over for the week. I am putting all three of you in the hot spring, and then I am making a massive dinner. Roasted boar, sweet potatoes, and double portions of ice cream. Nobody lifts a finger."
Kira managed a weak, purring smile, her tail wrapping lazily around Ren’s ankle as they walked toward the water.
Ren settled them into the healing baths, fetching fresh towels and pouring them cups of sweet nectar. As he watched them rest, their new, world-breaking titles safely hidden in their status panels, he looked up toward the ceiling of the cavern.
Deep in the Dark Woods, fifty miles away, the ground was trembling. The vanguard of the stampede was accelerating, driven mad by the shifting mana densities.
Let them come, Ren thought, a cold, archmage's smile playing on his lips. My girls have the data. And the math is not in the monsters' favor.