The aftermath of Abyssal manifestation did not feel like victory. It felt like dying.
It hit Kairo Ashford in the middle of the Vanguard Yard, minutes after they had carried Oren past him, his boots dragging through the mud. The adrenaline that had sustained him through the Void Fang was gone, and so was whatever had kept him standing over Oren's body, leaving behind a hollow, ringing emptiness in his chest. His twelve-year-old body was failing him. A freezing fever wracked his system, making his teeth chatter uncontrollably. The black, corrupted veins along his forearms had receded beneath his skin, but the flesh there felt like it was packed with crushed ice.
He would have collapsed into the dirt if not for the two trainees keeping him upright.
Malik Frost had Kairo's right arm draped over her shoulder. Despite her own exhaustion and the bruising she had taken during the Night Hunt, the twelve-year-old girl moved with steady, disciplined determination. Her blue eyes were guarded, focused only on keeping Kairo moving forward. On Kairo's left, Ruben Veil supported his other side. The twelve-year-old Ghost Demon Slayer Art user remained silent, his sharp brown eyes scanning the compound courtyard as if expecting another ambush, his curly black hair plastered to his forehead with freezing sweat.
They were no longer just roommates thrown together by the academy's cruel administration. The Ashenvale hunt had forged something real between them. They were a squad.
Zeke had walked through the gates on his own two feet out of pure stubbornness. Now his legs had finally quit, and a few yards ahead, two compound medics were rushing him toward the infirmary on a canvas stretcher. The pale, red-eyed trainee was clutching his ribs, coughing a weak mist of blood onto the fabric, but he managed to raise a single, trembling thumb toward Kairo before being carried through the heavy medical doors.
Renna Kade walked slightly ahead of Kairo, her white hair stained with mud and her shoulder wrapped in a hasty, blood-soaked field bandage. The twelve-year-old squad leader looked exhausted, but her posture remained aggressively rigid. She stopped near the armory steps and turned to face Room 9.
"Get him to the barracks," Renna ordered quietly, her grey eyes locking onto Kairo's pale, shivering face. The cocky arrogance she had carried into the forest was gone. "I have to report the kill, Ashford. Every word of it. And somebody up top is going to want to know how a first-year cut a stalker in half with his first Form." She hesitated. "I'm sorry about Dask. He talked about you."
Before Kairo could force a reply through his chattering teeth, heavy, armored footsteps echoed across the stone courtyard.
Two senior compound guards, clad in the dark purple and black armor of the Vanguard Yard, stepped into their path. They did not look at Renna, Malik, or Ruben. Their eyes were fixed on Kairo.
"Trainee Ashford," the taller guard said, his voice echoing from beneath a steel visor. "You are summoned to the upper tiers. Move."
Malik tightened her grip on Kairo's waist, her blue eyes flashing with sudden defiance. "He can barely stand. He needs to go to the infirmary. He has Abyssal fever from over-channeling."
"He is summoned by the Master," the guard replied coldly, resting a hand on the pommel of his sword. "Release him, trainee. Now."
Ruben's eyes darted between the guards' weapons and Kairo's trembling frame. He knew the strict hierarchy of the compound. Refusing a direct summons from a Slayer Master was grounds for immediate expulsion, or worse.
"Let me go," Kairo whispered, his voice thin and cracked. He gently pushed Malik's shoulder away and unhooked his arm from Ruben's neck. His legs wobbled, his knees threatening to buckle, but he locked his jaw and forced himself to stand upright. "I'm fine. Check on Zeke."
Malik looked like she wanted to argue, her fists clenching at her sides, but she stepped back.
Kairo forced himself to walk forward, following the two armored guards. Every step sent a jolt of freezing agony up his spine. They led him away from the bustling lower courtyards, up a long, winding staircase carved directly into the dark stone of the mountain. The air grew thinner and colder the higher they climbed, until they reached a wide, open-air pavilion that overlooked the entire Demon Slayer Compound.
The pavilion was lined with braziers burning with low, roaring flames. At the far end, kneeling on a woven mat with his back to the sweeping vista of the night sky, was a man who radiated an aura of immense pressure.
Master Draven Ryuu.
The Dragon Demon Slayer Master was a towering, imposing figure. He wore black-and-gold dragon-scale armor, the spiked, horned shoulder guards catching the firelight. His tail lay curled against the stone floor behind him, the tip of it tapping slowly, like a cat deciding something. Resting horizontally on a wooden stand in front of him was a black-and-gold dragon katana.
The guards stopped at the edge of the pavilion, bowing deeply before retreating down the stairs. Kairo was left alone with the Dragon Master.
"Sit," Draven commanded. His voice was a deep, resonating rumble that seemed to vibrate in Kairo's chest.
Kairo stumbled forward and dropped heavily onto his knees across from the Master, struggling to keep his teeth from chattering.
Draven opened his eyes. They were sharp, predatory, and golden. He looked at the pale, shivering twelve-year-old boy, taking in the fading black veins on Kairo's neck and the exhaustion rolling off him.
"I watched Ashenvale from the ridge," Draven said bluntly. "I watched you channel pure cosmic energy into a First Form strike that cut a demon twice your size in half."
Kairo swallowed hard, his throat dry. "I had to protect my squad, Master."
"You did," Draven agreed, his tone dangerously calm. "And you nearly destroyed yourself in the process. Look at your hands, boy."
Kairo looked down. His fingers were shaking so badly he couldn't even ball them into fists. His fingernails had turned a pale, sickly shade of blue.
"Your Cosmic Art is a rare, devastating path," Draven rumbled, leaning forward slightly. The pressure radiating from the man pressed down on Kairo's shoulders like a hand. "But your vessel is unformed. You are a glass cup trying to hold an ocean. If you pour that much water into the glass again, the glass will shatter, and the water will spill out and drown everyone around you."
"I can control it," Kairo lied, his voice shaking.
"You are freezing to death because your core is in shock," Draven countered effortlessly. The Dragon Master reached across the mat, his gauntlet closing around the hilt of Kairo's standard-issue longsword. With a swift, effortless pull, Draven stripped the weapon from Kairo's belt and placed it on the floor beside his own katana.
Panic flared in Kairo's chest. "Master, my sword—"
"Is confiscated," Draven finished. "You rely on your Abyssal energy because it is powerful. It is a crutch for your physical weakness. If I allow you to continue swinging a blade, you will inevitably channel that power again, and it will kill you. A Demon Slayer who cannot survive his own strength is useless to humanity."
Draven stood up. He towered over Kairo, his shadow swallowing the pavilion floor.
"Starting tomorrow at dawn, you are stripped of weapon privileges," Draven ordered. "You will not spar. You will not practice Forms. You will lift iron stones. You will run the mountain trails until your lungs bleed. You will carry weighted packs through the mud until your bones harden and your muscles tear and rebuild. No Abyss. Just your body, until it stops breaking."
Kairo stared up at the giant man, the fever making his vision blur. "For how long?"
"Until your glass cup is forged into iron," Draven rumbled, his golden eyes narrowing. "You want to wield cosmic power, Ashford? Then you must build a vessel capable of surviving it. Now get out of my sight and go to the infirmary before you freeze to death on my pavilion floor."
Kairo pushed himself up on shaking legs, bowed, and made it three steps toward the stairs before the words slipped out under his breath. "Fan-fucking-tastic."
"I heard that, Ashford."
Kairo did not turn around. Behind him, very faintly, something that might have been a dragon's laugh rumbled across the stone.
Three months earlier.
Three days' hard travel from the Compound, far removed from the academies and the frozen outer territories, a heavy silence blanketed the deep woods of the Starveil region.
The hidden marble sanctuary stood in a secluded clearing, surrounded by towering old-growth trees. Protective wards—invisible currents of celestial magic woven by Asterion the Great Mage—shimmered faintly in the air, distorting the space to keep the location hidden from Priest Hunters, demons, and wandering travelers alike.
Elara Ashford stepped through the boundary line.
She wore a traveling cloak, her boots stained with the mud of a long, desperate journey. She carried a large, reinforced leather medical satchel over her shoulder, packed tightly with rare herbs, surgical instruments, and alchemical binding agents.
Asterion stood at the entrance of the sanctuary, his ancient, sorrowful eyes watching her approach. He maintained his disguise perfectly. To the world, and to Elara, he was simply the Great Mage—a powerful recluse. She did not know he was a Celestial, and he could not afford to tell her.
"You made good time, Elara," Asterion said softly, his voice carrying the weight of centuries.
"Where is my husband?" Elara asked, her voice cracking slightly, though her posture remained fiercely composed. She was a master healer, a woman who had carried her sons out of a collapsing mountain. She did not break easily.
Asterion turned, leading her deep into the marble halls of the sanctuary. They descended into a subterranean chamber lit by glowing, floating spheres of magical light.
In the center of the room, lying on a heavy stone slab, was Kane Ashford.
Elara dropped her satchel. She rushed to the slab, her hands trembling as she hovered over her husband's chest.
Kane was unconscious, his broad, scarred chest rising and falling in shallow, ragged breaths. He was stripped to the waist, and his arms and legs were bound to the stone by thick chains of glowing celestial light. But the light was dimming.
Spreading outward from the old, jagged scar across Kane's lower-left ribs was a network of thick, pulsating black-and-violet veins. The demonic corruption had advanced aggressively since he had left his family. The veins were crawling upward, branching out like the roots of a poisoned tree, inching closer and closer to his heart.
"Kane," Elara choked out, gently pressing her hand to his feverish forehead. "Oh, my love."
Kane did not stir, but a low, unnatural growl vibrated deep in his chest—a sound that belonged to a predator, not a human man.
"The celestial bindings are failing," Asterion explained quietly, stepping up to the opposite side of the slab. "It is not mindless corruption, Elara. It is adapting. It learns my wards faster than I can weave new ones. And the command buried inside it never sleeps, even when he does."
Elara wiped a single tear from her cheek, her eyes hardening as the healer took over the grieving wife. She opened her leather satchel and began pulling out glass vials of crushed silver-leaf, sterilized bandages, and iron surgical clamps.
"Your letter said you can't burn it out," Elara said, uncorking a vial and pouring a specialized herbal numbing agent over the worst of the black veins on Kane's chest.
Asterion shook his head slowly. "If the corruption was surface-level, I could burn it away. But the essence has fused with his deep magical scars. It has woven itself into his spiritual structure. If I strike the corruption with lethal magical force, I will destroy Kane's soul along with it."
Elara's hands stilled. She looked across the stone slab at the ancient mage. "Then it's the Rite."
"It is the Rite," Asterion said heavily.
She had read the word in his letter three times on the road. Reading it was not the same as standing over Kane and hearing it said aloud. The Rite of Transference was forbidden magic in almost every kingdom. It was a brutal, dangerous procedure that involved tearing supernatural energy out of a living host.
"To transfer it, we need a vessel," Elara said, her medical knowledge already calculating the logistics. "Something strong enough to hold concentrated Abyssal power. And if the transfer fails…"
"If the ritual fails, the shock will stop his heart," Asterion confirmed, refusing to lie to her. "Or worse, the essence will violently tear itself free, fully consuming his humanity in the process. He will transform into a natural demon, and I will be forced to kill him to protect the world. The Rite requires perfect precision. My magic will pull the essence, but your medicine must keep his mortal body alive during the extraction. His heart will try to stop. You must not let it."
Elara looked down at the broad, scarred chest of the man she loved. Kane had fought border wars. He had taught their sons the Nine-Root Sword Style. He had sacrificed his own freedom to walk away from them so he wouldn't hurt them. She was not going to let him die on a cold stone slab.
"Prepare the vessel, Asterion," Elara said, her voice turning to cold iron as she arranged her surgical tools. "He is not dying today."
On the night of the Ashenvale hunt, the courtyard of Highmere Academy was silent and empty. The midnight wind howled off the eastern mountains, sending a dusting of frost across the cobblestones.
Cassian Ashford stood alone in the center of the training ring.
He was not asleep. He was not resting in Room 17 with Marcus, Frank, and Jack. He was focused on the light, unweighted wooden practice sword gripped tightly in his left hand. His right arm hung at his side, pale and thin, the wrist wrapped in a light support bandage.
First Root. Balance.
Cassian widened his stance, bending his knees. The muscle memory from his previous life, and the years of training under Kane, were all calibrated for a right-handed fighter. His hips wanted to pivot to the left. His shoulders wanted to drop the wrong way. Every instinct screamed that his posture was unbalanced, awkward, and vulnerable.
He swung the wooden sword horizontally.
The blade cut the air, but it felt clumsy. The torque was wrong. The edge alignment was slightly off. If he had hit a solid target, the blade would have glanced off harmlessly, leaving him wide open for a fatal counterattack.
Cassian gritted his teeth, stepping back to his starting position. Second Root. Patience.
He was twelve years old, his dominant arm was withered, and he was being hunted by the most ruthless religious inquisitors in the Mortal Realm. He could not use Universe God Slayer Art. If he met a Priest Hunter tomorrow, he would have to fight them with mortal steel. He had to learn how to fight all over again.
He swung the wooden sword again. Slightly better. He adjusted his back foot, transferring his weight to his right leg to compensate for the left-handed swing.
He swung again. And again. And again.
He drilled the basic mortal forms until his left shoulder burned and sweat soaked through his tunic, freezing in the winter air. He did not channel golden energy. He did not rely on his past-life magic. He relied purely on discipline, repetition, and the flat refusal to become a victim.
High above the courtyard, peering through the narrow, arched glass of the Western Archives, Seraphina stood in the shadows.
The Divine Phoenix Master watched the twelve-year-old boy practicing his left-handed swings in the freezing dark. She watched him fail, adjust, and try again, over and over, refusing to give up, and refusing to unleash the volatile power she knew was resting dormant inside his core.
Most trainees would have complained. Most would have demanded a magical cure, or grown bitter over their temporary weakness. Cassian merely put in the grueling, unglamorous work required to survive.
Seraphina smiled faintly, her copper hair catching the moonlight. He possessed the restraint she had been searching for. The broken spear ledger had brought him to her, but his discipline was proving his worth.
Cassian Ashford was going to be an exceptional God Slayer. But first, he had to survive being human.