The nightmare was always the same.
Kairo was back in the snowy courtyard of the Monastery of Silent Stars. He was staring at his father's back. Kane Ashford stood between his family and the Priest Hunters, his broad shoulders heaving, his wooden sword splintered. But when Kane turned around, his brown eyes were gone, replaced by a hollow violet light. The jagged black veins of demonic corruption had swallowed his neck and face. Kane raised his sword, but he did not point it at the Priest Hunters. He pointed it directly at Cassian.
Kairo lunged forward to stop him, reaching out with his left hand, but his arm dissolved into black ash the moment he moved.
Kairo gasped, his eyes snapping open.
He bolted upright in his narrow bed, his chest heaving, his heart hammering against his ribs like a trapped bird. The air in Room 9 was freezing, the stone walls radiating the bitter mountain chill, but Kairo was drenched in cold sweat.
He looked down at his left arm. It was still there. The white linen bandage Elara had wrapped around it was slightly loosened, but intact. However, a deep, rhythmic throb radiated from his elbow down to his knuckles, pulsing in time with his racing heartbeat. The Abyssal energy trapped in his flesh was agitated by the nightmare. It felt hot, heavy, and restless.
"Breathe, Kairo. Two counts in, four counts out."
The voice was low, cutting through the darkness of the room with total calm.
Kairo blinked, his eyes adjusting to the gloom. Sitting on the edge of the opposite bed was Zeke Morrison. The twelve-year-old was already dressed in his dark, violet-stitched Demon Slayer uniform. Zeke's striking red eyes were illuminated by the faint, blue glow of the single lumen-crystal hanging from the ceiling. He was holding one of his silver-capped wooden stakes, running a polishing cloth over the wood with slow, methodical precision.
"I'm awake," Kairo whispered, dragging his right hand over his face. He forced his breathing to slow, deliberately anchoring his mind in the First Root: Balance. Kane had taught him that panic was a fire; if you didn't starve it of oxygen, it would burn down the house.
"You were radiating Abyssal pressure in your sleep," Ruben Veil said from the corner of the room.
The twelve-year-old boy was sitting at the small wooden desk, his sharp brown eyes watching Kairo intently. Ruben had his own uniform on, his curly black hair slightly messy from sleep. "It felt like someone stacked iron plates on my chest for the last ten minutes. If you do that in the barracks, the instructors will think you are destabilizing. They will lock you in an isolation cell."
"I wasn't trying to," Kairo muttered, swinging his legs over the side of the bed. His left arm flared with a sharp, biting pain as gravity pulled the blood down into his fingertips. He winced, gripping his wrist to steady the tremor.
"The Abyss does not care what you are trying to do," Malik Frost said.
She stepped out of the small attached washroom, a towel draped over her neck. Her light-blue hair was damp, and her blue eyes were clear and focused. She walked over to her footlocker, opening it with a sharp click. "Demonic essence is predatory by nature. It wants to consume, expand, and dominate. When you sleep, your conscious will drops its guard. That is when the corruption tries to dig deeper into your channels."
Malik walked over to Kairo's bed. She held a clean strip of dark cloth in her hands. A faint, chilling mist rolled off her fingers, curling around the fabric. She had used her Ice Demon Slayer Art to rapidly drop the temperature of the cloth to near-freezing.
"Hold your arm out," Malik instructed, her tone practical and devoid of pity.
Kairo hesitated for a fraction of a second before extending his left arm. Malik gently unwrapped the ruined white linen his mother had applied the day before, exposing the mottled, bruised flesh and the faint, jagged black veins creeping up from his wrist.
Malik did not flinch at the sight of the corruption. She wrapped the super-cooled dark cloth around his arm, pulling it tight.
The moment the freezing fabric touched his skin, Kairo let out a sharp hiss. The cold jolted his nerve endings, dulling the burning, restless heat of the Abyssal energy. The throbbing receded, forced back into a state of temporary dormancy by the sudden drop in temperature.
"Thank you," Kairo breathed, flexing his fingers. The tremor was gone.
"Cold slows the flow of Abyssal essence," Malik said, stepping back and wiping her hands on her towel. "It is a temporary fix. It will not cure the veins, but it will buy you enough clarity to focus your mind. If you are going to survive the training yards today, you cannot be fighting the heat and the instructors at the same time."
"She's right," Zeke said, standing up. He slid his silver-capped stake into a leather holster strapped to his thigh. He towered over Kairo, his skinny frame belying the dangerous speed of the Vampire Demon Slayer Art. "My brother used pain to stay grounded. He used to press the edge of a knife into his thumb when the energy spiked. The physical sensation overrides the magical one. You have to remind your body that you are the one giving the orders."
Kairo looked at his three roommates. Zeke with his grim experience. Malik with her disciplined, practical Ice Art. Ruben with his quiet, hyper-observant eyes.
They had only known each other for a day, but the harsh, unforgiving environment of the Demon Slayer Compound was already forging them together. They were not friends out of convenience; they were forming a survival pact. They recognized that Kairo's Cosmic power was a liability to all of them if it detonated, but instead of shunning him, they were actively trying to keep him tethered to his humanity.
At the desk, Ruben had started flipping the small, rusted iron ring between his knuckles again. Kairo watched it catch the blue light of the lumen-crystal.
"It was my mother's," Ruben said, without looking up. He had noticed Kairo watching, the way he noticed everything. "She was a Slayer. The ring was the only thing that came back." He caught it in his fist and held it there for a moment. "I keep it moving so I don't have to think about it."
Nobody said anything. Nobody needed to.
"I won't let it spike," Kairo promised, standing up and grabbing his uniform tunic. "I know how to balance my center. I just need to figure out how to apply it to the Abyss instead of a sword."
"You have twenty minutes to figure it out," Ruben noted dryly, checking a small mechanical clock on the wall. "First bell rings at dawn. If we are late to the Vanguard Yard, Instructor Vane will have us hauling iron logs until our spines snap."
Kairo threw his tunic over his shoulders, wincing as he threaded his bandaged left arm through the sleeve. "Then let's not be late."
The Vanguard Yard was a vast, sprawling expanse of frozen mud, shattered stone, and rusted iron barricades located at the lowest tier of the Demon Slayer Compound. The morning air was bitterly cold, the sky above the canyon walls a bruised purple as the sun struggled to rise.
Over a hundred first-year trainees stood in ragged lines, their breath pluming in the freezing air. They were shivering, exhausted, and terrified.
The boy standing directly to Kairo's left in the second rank was grinning anyway.
He was small for twelve, freckled, with a mop of sandy hair and a chipped front tooth, and a faint orange shimmer of Ember Art flickered nervously around his knuckles. He leaned over while the instructors were still taking their places.
"Oren Dask," he whispered. "Room 10. You're the new one who warped the testing plate, right? The whole east wing heard it groan." He pressed something into Kairo's good hand: half a heel of black bread, still warm. "Breakfast. They never feed you before the log run. Nobody tells the new ones."
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Kairo stared at the bread. "Why are you giving me this?"
Oren shrugged, still grinning. "Because you look like you're about to fall over, and I'd rather not run behind you if you do." The grin faltered, just for a second. "And because my Art keeps flaring too. Figured we could be terrible at this together."
Standing on a raised wooden platform overlooking the yard was Instructor Vane. He was a hulking, scarred veteran missing his left eye, wearing spiked black armor. He carried an iron cane, which he used not for walking, but for striking the wooden platform with deafening, rhythmic cracks that echoed off the canyon walls.
"The Demon Slayer path is not a magical fantasy!" Vane roared, his voice like grinding gravel. "You are not fucking wizards! You are not scholars! You are human vessels attempting to cage the very essence of the demons that want to butcher your families!"
Vane slammed the iron cane into the platform. CRACK.
"If your body is weak, the Abyss will tear your muscles from your bones. If your mind is weak, the Abyss will corrupt your soul, and you will become the very thing you enlisted to kill. We do not tolerate weakness. We do not nurture it. We beat it out of you, or we bury you!"
Kairo stood in the second rank, sandwiched between Zeke and Ruben, with Malik holding the position directly behind him. He kept his breathing slow, feeling the icy bite of Malik's wrap beneath his sleeve keeping the Cosmic energy at bay.
"Today, you will learn the fundamental principle of Abyssal containment under physical duress," Vane commanded, pointing his cane toward a pile of black iron logs resting at the edge of the yard. Each log was five feet long, thick as a man's thigh, and easily weighed a hundred and fifty pounds.
Kairo stared at them. No twelve-year-old alive could carry that.
"You can, though," Oren whispered, reading his face. "All of us can, now. The second your channels opened to the Abyss, it started rebuilding you. Denser bone. Tighter muscle. You've probably been eating like a horse and not knowing why." He swallowed. "That's why they use iron. Wood stopped hurting us the week we woke up."
Kairo thought of the thirty-mile walk through the mountains on a ruined arm. He thought of how he had not collapsed. He hadn't questioned it. He questioned it now.
"You will each shoulder an iron log," Vane explained cruelly. "You will run the perimeter of the Vanguard Yard. While you run, you will summon a fraction of your Abyssal essence—just enough to create a visible aura around your hands. You will maintain that aura without letting it flare, without letting it fade, and without dropping the log."
A collective murmur of dread rippled through the recruits. Channeling Abyssal energy required total concentration. Doing it while undergoing agonizing physical labor was designed to intentionally force a loss of control.
"If your aura fades, you run an extra mile!" Vane shouted. "If your aura flares out of control, you will be beaten into submission and dragged to the infirmary! Move!"
The ranks broke into a chaotic sprint toward the pile of iron logs.
Kairo reached the pile, gritting his teeth as he hoisted one of the iron cylinders onto his right shoulder. The weight of the metal drove him straight to his knees, his boots sinking into the freezing mud. "Shit," he gasped, straining his legs to force himself back up. His body was stronger than it had any right to be. It was not strong enough yet.
Beside him, Zeke hoisted his log with surprising ease, his Vampire Demon Slayer physiology naturally lending itself to explosive, wiry strength. Malik hoisted hers with a sharp grunt, her athletic build locking into a perfect lifting posture. Ruben struggled the most, his twelve-year-old frame shaking under the iron, but his stubborn pride refused to let him drop it.
"Start moving, Room 9!" Zeke ordered, taking the lead and setting a brutal, grueling pace along the muddy perimeter track.
Kairo fell into line behind Zeke, the iron log biting viciously into his collarbone. He focused on his breathing. Inhale the cold. Exhale the weakness.
"Summon the aura!" Vane roared from the center of the yard, striking the platform again.
Kairo closed his eyes for a split second. He reached into his core, bypassing the fear, bypassing the memory of his father, and tapped into the reservoir of his Cosmic Demon Slayer Art.
He didn't pull a stream. He pulled a single, microscopic thread.
A faint, dark-violet mist began to drift off his knuckles. It was dense, pulsing with a deep, gravitational hum.
Keep it small, Kairo told himself, staring at Zeke's back as they ran through the thick mud. Keep it quiet.
For the first half-mile, it worked. The pain of the iron log on his shoulder acted exactly as Zeke had predicted—the physical agony provided a sharp, grounding anchor that kept his mind from slipping into the intoxicating, aggressive high of the Abyssal power.
But as they crossed the one-mile mark, Kairo's physical stamina began to crack.
His lungs burned. His legs felt like lead. And the freezing temperature of Malik's cloth wrap had finally warmed against his skin, robbing him of the numbing protection.
The moment his physical focus wavered, the Abyss surged.
Kairo gasped as a sudden spike of Cosmic energy tore through his left arm. The faint violet mist on his knuckles abruptly erupted into a thick, swirling cloud of pure blackness. The air around him suddenly grew unbearably heavy, the gravitational pressure of his specific Art indiscriminately crushing downward.
"Ashford!" Ruben shouted from behind him, stumbling as Kairo's gravitational aura accidentally increased the weight of the iron log on Ruben's shoulder. "Pull it back! You're crushing the perimeter!"
Kairo couldn't answer. His vision was swimming. The black veins on his left wrist began to burn like branded iron, throbbing with a sickening heat. The Abyss was reacting to his exhaustion. It was trying to take over the burden of the iron log by flooding his muscles with demonic strength, but it was demanding his control in exchange.
Let me carry it, a dark, wordless impulse whispered in the back of his mind. Let me crush the iron. Let me crush the yard.
"No!" Kairo snarled aloud, stopping in his tracks.
He dropped to one knee in the mud, still balancing the iron log on his right shoulder, his left hand glowing with an unstable black halo. He was losing containment. If he flared any higher, Instructor Vane would order the enforcers to beat him unconscious. If he dropped the log, he failed.
"Kairo, anchor your stance!" Malik yelled, stopping beside him. She couldn't touch him without dropping her own log, but she projected a sudden, intense wave of Ice Demon Slayer aura outward, flooding the air around Kairo with freezing, biting frost.
The sudden cold shocked Kairo's system, breaking the hypnotic trance of the Cosmic power.
"He's fighting it the wrong way," Zeke said, holding his log steady as he circled back. "You're trying to build a wall against the ocean, Kairo! It will just break the wall. You have to redirect the current!"
Kairo gritted his teeth, his violet eyes wide and panicked. Redirect the current.
He thought of Kane. He thought of the Nine Roots.
First Root: Balance. A sword does not begin in the hands. It begins where your feet choose to remain.
Fourth Root: Courage. Courage is the decision to move while understanding the danger. It is not the absence of fear, and it is never permission for reckless attacks.
Kairo stopped trying to push the Cosmic energy back down into his core. Instead, he accepted that it was in his arm. He shifted his footing in the mud, establishing a low, grounded base. He stopped treating the Abyss like an enemy trying to kill him, and started treating it like a wildly swinging blade that he needed to parry.
He inhaled sharply, pulling his scattered, frantic concentration into a single, needle-point focus.
Compress it, Kairo commanded himself. Don't banish it. Crush it into a single point.
He applied his own gravitational will against the rogue energy. The thick, swirling black cloud surrounding his left hand suddenly shuddered. Slowly, agonizingly, the violent mist began to pull inward, condensing, shrinking, and compacting until it formed a tiny, hyper-dense sphere of dark-violet light hovering just an inch above his knuckles.
It was no larger than a coin, but it hummed with perfect, eerie stability.
Kairo exhaled a long, shuddering breath. The burning in his veins stopped. The unnatural gravity in the surrounding air vanished.
"He stabilized it," Ruben muttered, staring at the tiny, hyper-dense spark with wide, calculating eyes. "He didn't just contain it. He compressed it."
"Keep moving!" Zeke ordered, a genuine grin breaking across his pale face. "Don't let Vane see you kneeling. He'll make it a fucking lesson."
Kairo forced himself back to his feet, the iron log biting into his bruised shoulder. He resumed the grueling pace, falling back into line behind Zeke, his left hand maintaining the tiny, perfectly controlled spark of Cosmic power.
He had survived the spike. He had used his father's mortal discipline to leash the demon in his blood.
High above the Vanguard Yard, standing on a secluded iron balcony carved into the canyon wall, a towering figure watched the recruits running in the mud.
The man wore intricate black-and-gold armor covered in jagged, overlapping scales. A long tail rested against the stone floor behind him, and the hilt of a black-and-gold katana was visible over his broad shoulder.
New recruits always assumed the tail was part of the armor. It was not. The scales ran up from it under the plate and showed again at the back of his neck, above the collar, and when the wind gusted over the balcony, the tip of it flicked like a cat's. Draven Ryuu was part dragon, and the blood had not stayed politely in his veins.
Master Draven Ryuu, the Dragon Demon Slayer, crossed his gauntleted arms over his chest. His slitted golden eyes were locked on the twelve-year-old boy with red hair running in the second rank.
Draven had felt the sudden, localized spike in gravitational pressure from fifty feet in the air. He had seen the black-and-violet energy flare, recognizing the catastrophic signature of the Cosmic Demon Slayer Art—a lost, forbidden discipline that usually tore its users apart before they reached adulthood.
But he had also seen the boy refuse to shatter. He had watched the boy compress a wildly unstable Abyssal flare into a perfect, disciplined singularity using nothing but willpower and a clean martial stance.
"A cosmic anomaly," Master Draven rumbled, his voice a deep, resonant growl that vibrated with draconic power. A slow, dangerous smile pulled at the corner of his scarred mouth. "Let us see if you survive the winter, little star. If the Abyss doesn't eat you... I might just forge you into a weapon."
Down in the mud, Kairo Ashford kept running, unaware of the dragon's eyes tracking his every step.
He was cold, he was bleeding, and his bones felt like lead. But as he looked at the backs of Zeke, Malik, and Ruben, holding their own iron logs and maintaining their own Abyssal auras, Kairo felt a fierce, burning spark of genuine hope.
He was not going to die in this compound. He was going to master this power, find a Master who could teach him how to weaponize it, and survive long enough to see his brother again.