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Regressed Into the Fallen Demon-Slayer Heir

Arthur_Pendragone
7
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The average realized release rate over the past 30 days is 7 chs / week.
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Synopsis
The Demon King has fallen. The war is over. Yet peace has birthed a new kind of monster—humans. A century later, a hero returns as the heir of House Aldebaran, the once-revered demon-slaying bloodline now reduced to a name and crumbling ruins. Bound to a gauntlet that feeds only on tainted essence, he walks a path to power that can never be clean. As the world begins to fracture and darkness whispers once more, one question remains: Will he become the hero the world needs… or the sin it uses to survive?
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Chapter 1 - Chapter 1 — The Last Breath of a Hero

The sky was bleeding.

Not the gentle red of dawn—this was violence painted across heaven, as if the world had been split open and was struggling to remember how to be whole.

Ash drifted in lazy spirals, refusing to fall the way gravity demanded.

As if even the air was afraid to touch the ground.

Gabriel van Aldebaran stood in the crater of what had once been a throne room—what had once been a mountain.

His cloak was gone. His armor was fractured into clean, cruel lines, like the Demon King had been carving him into a warning.

Every breath scraped.

Not his lungs.

His soul.

He felt it: a dwindling thread stretched thin inside his chest, humming with pain each time he pulled air into himself. He had learned to ignore pain long ago.

But this wasn't pain.

This was currency.

He was paying with himself.

Across from him, the Demon King rose from its own impact crater like a nightmare refusing to end.

Its crown wasn't gold or bone.

It was a halo of shadows—flickering with faces—screaming, laughing, pleading—then melting back into darkness. Its body was too tall, too still, too patient.

Like a statue that had learned how to hate.

The Demon King tilted its head.

"Again?" it asked, voice mild, almost curious. "You truly have nothing left but stubbornness."

Gabriel lifted his sword.

Aldebaran steel—pale as moonlight, etched with runes older than kingdoms. The blade didn't glow.

It didn't need to.

Against demons, Aldebaran steel didn't just cut flesh.

It cut what made them demons.

His grip shook.

Not from fear.

From emptiness.

A faint tremor ran up his arm, and he tasted iron that wasn't blood—just the bitter flavor of life force burning at the edges of his tongue.

He stepped forward.

The Demon King moved like a slow tide. The air thickened. Pressure rolled out—heavy as guilt—crushing ash into stone. Shadows spilled from the crown like ink, reaching for Gabriel's ankles.

Gabriel didn't look down.

He couldn't afford distraction.

He couldn't afford anything.

He lunged.

The first strike wasn't a swing.

It was a declaration.

Aldebaran arts flared through his muscles in a white-hot line—power channeled through bone and breath and stubborn will. His sword cut forward and for an instant the world sharpened around the edge.

The Demon King raised a hand.

Gabriel's blade struck the palm and—

—light detonated.

Not pretty. Not warm. A harsh, clean radiance that tore at shadows like claws.

The runes along the sword's edge lit for a heartbeat.

And so did Gabriel's veins.

He felt it instantly: a part of him vanished.

Not lost.

Spent.

Like a page ripped from a book before it could be read.

His heart stuttered. His vision flashed white.

Still—still—the Demon King's palm cracked.

A thin brand of pale light burned into its black flesh.

The Demon King stared at the mark, almost amused.

"Ah," it murmured. "That taste. The old house still bites."

Gabriel forced another breath. The air smelled like scorched incense and ruined prayers.

He didn't let himself slow.

He pivoted and struck again—this time not at the hand.

At the throat.

The Demon King's shadow-halo surged. Darkness rose like a curtain between them, thick as deep water. Gabriel's blade sank into it.

The runes flared.

His life force ignited.

The sensation wasn't burning flesh.

It was burning meaning.

Burning the invisible thing that made him Gabriel.

His knees threatened to buckle.

He kept moving.

Because beyond the shattered columns, beyond the cratered battlefield, there were banners—blurred silhouettes between smoke and memory.

Dwarves with braided beards and copper rings, hammers raised as they roared defiance.

Elven archers, faces streaked with soot, posture still perfect as if beauty itself refused to bow.

Beastkin charging through ash, claws and fangs bared, war paint smudged but not erased.

And above them—

Aldebaran's banner.

A white starburst on deep midnight cloth. Torn to rags.

Still flying.

Gabriel tightened his grip.

"Don't you dare," he whispered—whether to the Demon King or to the world itself, he didn't know.

The Demon King's eyes—too many pupils stacked in spirals—watched him with something that looked almost like pity.

"Look at you," it said softly. "Even now you fight like a man who believes in endings."

Gabriel drove forward.

He poured what remained into one clean line of motion.

The curtain of shadow split—bisected by pale steel.

For the first time, the Demon King stepped back.

A thin cut appeared across its neck, leaking not blood, but black vapor that hissed as it touched the air.

Gabriel's mouth twitched.

A humorless thing.

"If you'd just stay dead," he rasped, "this would be easier."

The Demon King blinked slowly.

"Easier," it repeated, savoring the word. "You dream of ease, Hero. That is why you will fail."

Then its voice dropped—intimate, like a lover confessing.

"Kill me… and your peace will rot."

Gabriel's pulse thudded weakly.

He had heard threats before. Heard prophecies. Heard bargaining from monsters that didn't want to die.

But this wasn't desperation.

The Demon King sounded… certain.

It lifted a finger and pointed past Gabriel—toward the armies, the distant mass of survivors, the shapes already gathering around victory like flies around sweet meat.

"Even now," it continued, "they count who will own the ruins. Who will sit on which throne. Who will write which history. Your victory will not save them from themselves."

Gabriel's jaw tightened.

He wanted to spit back something heroic. Something bright.

He had no breath for bright.

"All I hear," he said, voice low, "is a demon begging."

For the first time, the Demon King smiled.

Not wide.

Almost fond.

"Oh, Gabriel," it whispered—using his name as if it had been allowed to. "I am not begging."

The air grew colder. Ash began to fall properly, like snow over a grave.

"I am remembering."

The Demon King stepped forward.

And the world shrank.

Its presence pressed down on Gabriel like an ocean. Stone cracked beneath his boots. His bones groaned. The runes on his sword dimmed, as if even they were choking.

Sound dulled.

He could hear distant screams—his allies—but they sounded far away now, muffled by the Demon King's will.

The creature raised its hand.

A sphere of darkness formed there.

A small night that swallowed the light around it.

Inside it, faces swam—humans, elves, dwarves, beastkin—eyes wide, mouths open in silent pleas.

Gabriel's stomach twisted.

The Demon King could end him.

Erase him.

Consume him.

It didn't.

It held the sphere casually, like a noble holding a glass of wine.

"You are almost empty," it said. "Do you know what is amusing? You could stop."

Stopping would mean living.

Living would mean watching.

Watching humanity crown itself and call it virtue.

Watching Aldebaran's banner become a relic sold in markets.

Watching the sacrifices of an entire war get rebranded into ceremony.

His sword trembled.

He could feel every scar on his body vibrating with exhaustion.

He lifted the blade anyway.

The runes flared once, as if cheering him on with their last breath.

He took one step.

The sphere pulsed.

He took another.

Pressure intensified. Something in his chest tore—not flesh.

Something more precious.

He tasted sunlight.

He heard, for a heartbeat, a voice he hadn't allowed himself to remember in years—

"Gabe. Don't come home empty-handed."

His mother.

The memory hit like warmth.

And then it slipped away like sand between fingers, gone the moment he tried to hold it.

His throat tightened.

He couldn't afford tears.

He couldn't afford memories.

He took a third step.

The Demon King's hand angled slightly.

Gabriel understood without being told.

This was it.

The final exchange.

He had enough life force for one true strike.

Maybe two if he lied to himself.

He didn't lie.

He inhaled, drawing power not from mana, not from the world—

—but from the last thin thread of his existence.

It poured into his limbs like molten light.

The sensation was almost beautiful.

Like becoming weightless.

Like becoming nothing.

His sword rose.

The runes blazed.

Aldebaran arts awakened fully—sharp, clean, absolute.

The blade sang.

And as it sang, Gabriel felt his life force unravel.

It wasn't painful the way a wound was painful.

It was painful the way goodbye was painful.

He saw flashes bloom behind his eyes:

A snow-covered courtyard.

A practice sword too large for a boy's hands.

Wax seals stamped with a starburst crest—proud, unquestioned.

A battlefield where different races fought back-to-back because the world demanded it.

Names he didn't have time to say goodbye to.

The Demon King watched him with a strange stillness, like a man watching a candle burn down.

"Do it," it said. "Spend it all. Give the world your last breath. They will take it."

"They will call it their right."

Gabriel smiled without humor.

"Then let them choke on it."

He moved.

Not forward—

through.

Aldebaran steel cleaved the air and the air gave way. The darkness sphere shattered like glass, the trapped faces dissolving into smoke. Shadows recoiled from the sword's radiance as if burned.

Gabriel's body screamed in silent protest.

He didn't listen.

He poured everything into the strike.

Everything.

Not just strength.

Not just will.

The years inside him.

The unspoken hopes.

The future he'd never get.

His life force flared like a star going supernova—

—and he felt himself hollow out in real time.

His heart slowed.

His skin went cold.

His fingers numbed—

—but the blade reached the Demon King's chest.

For the first time, surprise broke the creature's calm.

Gabriel drove the sword in.

The runes detonated.

Light devoured shadow.

The Demon King's body cracked down the middle—a fissure of pale radiance splitting its torso as if the world itself rejected it. The shadow crown collapsed inward, faces screaming as they were pulled into nothing.

The Demon King looked down at the sword in its chest.

Then back up at Gabriel.

Its lips moved.

A final whisper, soft enough to be almost tender.

"See… what they become."

And then—

It shattered.

Not into blood.

Not into gore.

Into a storm of black ash that scattered into the wind, thin and bitter, like a curse finally released.

The pressure lifted.

Air rushed back.

Sound returned in a wave—cheers, cries, weapons clattering to the ground, sobbing laughter from survivors who didn't know what to do with their living bodies.

Gabriel remained standing.

For a moment.

His sword slipped from his grasp and struck the stone with a dull clang that sounded far away.

He stared at his hands.

They looked… wrong.

Not translucent.

Just—

too light.

As if the world had already started letting go of him.

His life force was gone.

All of it.

He had expected pain.

Instead, he felt relief so pure it frightened him.

His knees buckled.

He fell to one knee, then the other, head bowed as if praying to a god he no longer believed in.

Footsteps pounded toward him. Voices overlapped.

"Hero! Hero, are you—?"

"Get the healers—!"

"Gabriel van Aldebaran! You did it! You did it!"

Hands reached for him.

Gauntlets, gloves, bare fingers—grabbing at his shoulders like he might drift away if they didn't anchor him.

He looked up.

Faces swam in and out of focus.

Some were crying.

Some were grinning.

Some were already measuring the world, calculating the price of the next thing they could claim.

A man in polished armor pushed through the crowd.

His cape was too clean.

His chestplate too ornate for a battlefield.

White gloves.

Not a speck of ash on them.

A silver badge pinned near his collar—an eight-pointed star framing a laurel wreath.

Gabriel's gaze snagged on it even through the haze.

The man's eyes slid past Gabriel—past the dying hero—and locked onto the empty space where the Demon King had been.

His lips moved, speaking to someone beside him. Gabriel couldn't hear everything over the noise, but the fragments that reached him were enough.

"—secure the site—"

"—collect anything that remains—"

"—this victory belongs to—"

Another voice—sharp, eager—answered, "The Association will handle the narrative."

The Association.

The word struck Gabriel like an echo even as his senses dulled.

He tried to focus.

Tried to identify the speaker.

Tried to remember why that phrase made his stomach twist.

His body didn't cooperate.

The edges of his vision darkened.

Beyond the crowd, an Aldebaran banner still stood in the distance—torn, drooping, stubbornly upright.

Then someone stepped in front of it.

Blocking it from view.

A silhouette broad and self-important.

Gabriel's throat worked.

He wanted to speak.

To warn them.

To laugh, because of course.

Of course humans would turn the end of the world into a meeting.

He heard someone say, too loudly, "The hero's sacrifice will inspire the people! We must present his final moments properly."

Another replied, "A statue. No—an annual commemoration. A holiday."

Gabriel's mouth twitched.

A smile that didn't reach his eyes.

His voice came out as almost nothing.

"Make sure…" he tried.

Air.

"…spell my name right."

If anyone heard, they didn't react.

They were already looking past him—toward spoils, toward relics, toward the bright idea of ownership.

Gabriel's eyelids grew heavy.

The noise dimmed.

The sky's bleeding red softened into gray.

He felt himself falling inward, deeper than sleep, deeper than exhaustion.

This was death.

He had earned it.

He welcomed it.

Darkness wrapped around him like a cloak he hadn't worn in years.

The last thing he remembered before everything vanished was the Demon King's whisper:

See what they become.

A sound dragged him back.

Not a cheer.

Not a war cry.

A creak.

Long, slow, complaining—

like a throat trying to clear itself after a century of silence.

Gabriel's eyes snapped open.

He inhaled sharply and choked.

Dust flooded his lungs—dry and bitter. He coughed hard, tasting mold, old wood, and something faintly metallic.

He tried to move and pain lit up every joint.

Not the clean pain of battle.

This was the soreness of neglect.

Of muscles that had been surviving without thriving.

His hands—

His hands—

were thinner.

Paler.

Fingers longer, knuckles sharper, veins too visible beneath skin stretched tight.

He stared at them, confused.

His heartbeat was stronger than it should have been.

He wasn't dead.

The air was colder too, damp with a chill that seeped into bone. The darkness around him wasn't the endless void of death.

It was a room.

A real room.

So dim he could barely make out shapes.

He blinked hard.

A faint, sickly light filtered in through a cracked window, glass filmed with grime.

He was lying on a floor.

Not stone.

Wood—warped and splintered, boards stained with age. When he pushed himself up, his palms left clean streaks in the dust like he was disturbing a grave.

His head swam.

He grabbed the nearest solid object—an overturned chair—and hauled himself upright with a grunt.

The chair groaned in protest, as if offended to be used.

Gabriel swayed.

His balance was wrong.

His center of gravity different.

This body didn't respond with the honed obedience of a warrior.

The room came into focus in jagged pieces:

A grand fireplace choked with ash and collapsed brick.

Curtains hanging in strips, fabric eaten through.

A chandelier above, missing most of its crystals, dangling like a spider's broken web.

Portrait frames—crooked, shattered—canvases slashed like someone had wanted the faces erased.

This place had once been rich.

Now it was a carcass.

A familiar shape on the far wall caught his eye—half hidden behind peeling wallpaper.

A crest.

He stumbled toward it.

Each step felt wrong.

Weaker.

Untrained.

He reached the wall and brushed dust away with shaking fingers.

The Aldebaran crest stared back at him.

Or what was left of it.

The starburst had been carved into the wood once—proud, sharp, radiant.

Now it was defaced. Scratched over. Splintered at the center as if someone had driven a nail through the heart of the house itself.

His stomach turned.

The Demon King's whisper returned like a needle.

See what they become.

A faint drip echoed somewhere deeper in the mansion.

Drip.

Drip.

Drip.

Steady as a clock.

Gabriel swallowed. His throat was dry enough to crack.

He turned, scanning the room for anything—anything—that would tell him where, or when, he was.

His gaze caught on a broken mirror leaning against a wall, half covered by a moth-eaten cloth.

He froze.

The mirror's surface was dusty.

Still reflective.

He stepped closer, slow, as if approaching an enemy.

His reflection moved with him.

Not his face.

Not the battle-worn scarred man who had stared down the Demon King.

The man in the mirror was younger. Hollow-cheeked. Too pale. Dark hair unkempt. Eyes the same shape—

—but the gaze inside them felt displaced.

Like a sword forced into the wrong sheath.

Gabriel lifted a hand.

The reflection lifted a hand.

His fingers trembled.

His lips parted.

The voice that came out was not Gabriel's.

It was rough. Weak. Unfamiliar.

A whisper from behind him answered first—soft, like a ghost remembering how to speak.

"…Vincent?"

The name struck like a bell.

His reflection's mouth moved.

And in the mirror, the stranger's lips formed it again—silent, undeniable.

Vincent.

Gabriel—no—

Gabriel van Aldebaran—stared at the ruined crest on the wall, then at the hollow-eyed man in the mirror, and the world tilted under the weight of that single name.

This was his home.

And this was not his body.

He was—

"Vincent de Aldebaran."