Unprecedented humiliation.
Kokushibo's grip on his flesh-forged blade trembled slightly. He was reminded of the younger brother who had once driven him into despair.
But even Yoriichi had never looked at him with such contempt, as if he were nothing more than roadside debris.
Muzan, on the other hand, was pushed beyond reason by these words.
For a thousand years, he had believed himself to be the closest thing to perfection, yet now he was being trampled and insulted by a mere youth.
"I'll ..Kill you… at any cost! You have to DIE!!!"
Muzan's body began to mutate violently.
His pale skin was covered by thick, dark red bone armor. His legs transformed into digitigrade limbs, and dozens of thicker, barbed tendrils burst from his back, releasing toxic mist as they lashed through the air.
He had cast aside all disguise, revealing his true combat form as the Demon King.
Kokushibo closed his eyes and took a slow breath.
When his six eyes opened again, the blade in his hand expanded with countless writhing branches, and his sword intent soared to its peak.
Moon Breathing, Sixteenth Form: Moonbow—Half Moon Night!
Akaza forcefully suppressed the searing pain in his arm, kicked off the ground, and pushed his battle spirit to its absolute limit.
Technique Development: Final Form—Blue Silver Chaotic Glow!
At that moment, the three strongest demons abandoned all restraint, unleashing their Blood Demon Arts and life force to the extreme.
Crescent blades filled the sky. Devastating shockwaves tore through the air. Poisonous bone whips sealed off every direction.
The three forces converged into a catastrophic storm, powerful enough to level an entire mountain range, roaring as it bore down on Rin.
Where it passed, stone was reduced to dust, and the earth fractured inch by inch.
Facing this world-ending assault—
Rin came to a stop.
He slowly returned the Kusanagi sword to its sheath.
"I was planning to play with you a little longer…"
Rin raised his head, and within those crimson Eternal Mangekyō Sharingan, a cold indifference toward all life emerged.
"But since you're so eager to die, I'll grant your wish."
"Witness what true power looks like."
Boom—!!!
As Rin's words fell, an overwhelming, majestic aura of purple-red chakra erupted from his body.
The sheer quality of this chakra was so terrifying that the surrounding space visibly distorted.
The incoming crescent blades, shockwaves, and poisonous whips were instantly shattered with a piercing screech the moment they came into contact with it.
"This again… Is his energy endless?!"
Muzan's eyes widened in shock, his charge halting mid-step.
Under his horrified gaze, the purple-red chakra rapidly took form in midair.
First came towering ribs, followed by interwoven muscle fibers, massive limbs, and finally a heavy suit of tengu-like armor that enveloped the entire body.
The wind howled as the very color of the world seemed to shift.
In just two heartbeats...
A colossal purple-red war god, hundreds of meters tall with enormous wings on its back, rose abruptly from the wilderness.
Perfect Susanoo.
Its towering form pierced the clouds like an unscalable mountain.
The moment its wings spread, a violent hurricane swept outward, dispersing all clouds within several kilometers and revealing the waning moon high above.
At the center of the Susanoo's forehead, within a diamond-shaped crystal..
Rin stood with his hands behind his back, gazing down at the three demons below as if they were nothing more than insects.
Suffocation.
Despair.
The sword slipped from Kokushibo's grasp and clattered to the ground.
He looked up at the towering figure, and the martial spirit he had honed for four hundred years collapsed completely.
What kind of swordsmanship was this? What kind of Blood Demon Art?
No… this wasn't something a mortal could wield.
This was divine punishment.
Akaza's legs gave out, and he fell to his knees. The Destructive Death: Compass Needle he took such pride in was meaningless before a being of this scale.
You might sense a mountain falling on you—but could you ever dodge it?
"This… this isn't a Breathing Style at all!!!"
Kibutsuji Muzan stared at the colossal figure that stood between heaven and earth, his body trembling uncontrollably.
Every cell in his body screamed for him to flee.
When he had faced Tsugikuni Yoriichi, what he felt was the sharpness of death itself.
But now..
Facing this Susanoo, he felt something far worse.
A complete and utter erasure of his existence.
"A thousand years of existence… utterly wasted."
Rin's voice echoed from within the Susanoo, resounding across the entire wilderness.
The massive right arm of the Perfect Susanoo slowly lifted, its slender hand clenching tightly in the air.
Clang!
A purple-red chakra greatsword, over a hundred meters long, condensed into its grasp.
Before the blade even moved, the pressure it emitted carved a trench several meters deep into the ground below.
"It's over."
Rin narrowed his eyes.
The Susanoo gripped the greatsword with both hands and brought it down in a single, overwhelming slash.
Swoosh—!!!
For a moment, time seemed to freeze.
There was no sound.
The speed of the swing had surpassed the speed of sound itself, creating a visible vacuum as the air was displaced.
The instant the blade struck the earth—
A crescent-shaped wave of purple energy, stretching for thousands of meters, surged forward, destroying everything in its path.
Rumble!!!
The land let out a piercing groan.
The very tectonic layers were torn apart by the sheer force.
Where the slash passed, rock shattered and the earth was overturned.
Muzan, Kokushibo, and Akaza, caught at the center of the attack, had no time to react.
Before such overwhelming power, their bodies were insignificant.
Kokushibo was instantly torn into countless fragments.
Akaza's body, which he prided himself on, was more than half obliterated on the spot.
Muzan frantically activated his regeneration, attempting to split into thousands of pieces to escape.
But the heat and impact of the attack crushed most of those fragments into nothing.
The remaining force of the slash continued onward, ravaging the distant land.
Kilometers away, the Hashira leading the Demon Slayer Corps to clear out lesser demons suddenly felt the ground shake violently, as if a massive earthquake had struck.
They turned in horror toward the battlefield.
And froze.
On the distant horizon..
The mountain range that once stretched for over ten kilometers… was gone.
In its place lay a vast, bottomless canyon carved into the earth.
Underground water veins had been severed, pouring out from the cliffs and forming new waterfalls.
A single strike had split the land, erased mountains, and rewritten the terrain itself.
"…Is this… a miracle?"
Gyomei Himejima fell to his knees, tears streaming down his face.
Sanemi Shinazugawa didn't even notice when his Nichirin Blade slipped from his grasp.
At the center of the battlefield, the dust gradually settled.
The once flat wilderness had been completely torn apart.
At the edge of the massive trench, three pools of shattered, rotting flesh struggled weakly to move.
The vitality of the Twelve Kizuki was indeed terrifyingly resilient.
Even after suffering such a catastrophic blow, Kokushibo's remaining half-head, one of Akaza's severed hands, and the heap of Muzan's flesh—like rotting sludge—were still writhing, trying to reassemble and regenerate.
"Still not dead?"
Rin looked down at the grotesque mass, a slight lift in his brow.
"Fair enough. Pure physical attacks aren't enough to completely erase this kind of cellular regeneration."
The pattern in his right eye contracted sharply.
The Susanoo dispersed the greatsword in its hand.
Its left arm rose, and a massive longbow formed from Lightning Release chakra.
The right hand drew the bowstring to its limit.
A cluster of pitch-black flames ignited out of thin air along the string.
Under Rin's control through Flame Release: Kagutsuchi, the flames stretched and condensed, shaping into a jet-black arrow dozens of meters long.
"Flame Release: Susanoo Kagutsuchi."
The black flame arrow radiated a terrifying heat, as if it could burn even space itself.
Kokushibo's lone remaining eye stared at the arrow, and absolute despair filled his mind.
He knew—once touched by that flame, it would never be extinguished.
Muzan's scattered flesh burrowed frantically into the ground, attempting to flee this inevitable death.
"A futile struggle."
Rin released the bowstring.
Twang!
The black flame arrow shot forward like a falling star, carving a path of destruction through the air before striking the center of the writhing mass.
Boom!!!
At the moment of impact, it didn't merely explode.
The black flames surged outward like a collapsing ocean, spreading in every direction.
Within seconds, the scorched earth for kilometers around was transformed into a blazing inferno of pitch-black fire.
"AAAAAAAH!!!"
A scream of unimaginable agony echoed from within the flames.
This time, whether it was Kokushibo's mangled head, Akaza's severed limb, or the fragments of Muzan's body..
The instant they came into contact with the Amaterasu flames, all regenerative ability was completely suppressed.
Their demon cells became fuel for the fire.
They twisted, writhed, and melted within the sea of black flames.
The sins of a thousand years were finally brought to their end.
The screams gradually faded.
Minutes later, silence returned to the wilderness.
Only the black flames remained, quietly burning even the earth and stone.
Kibutsuji Muzan, the arrogant progenitor of demons.
Kokushibo, Upper Rank One, who had lived for four hundred years.
Akaza, Upper Rank Three, obsessed with strength.
In this utterly one-sided battle, they were reduced to nothing—burned away along with their pride and ambition.
Rin stood within the crystal of the Susanoo, gazing down at the land below, its terrain reshaped and its sins erased.
The crimson glow of the Eternal Mangekyō Sharingan gradually faded, returning to calm, dark eyes.
"It's over."
He let out a quiet sigh.
With a thought, the black flames blanketing the land receded like a falling tide, quickly gathering and extinguishing.
The colossal Susanoo dissolved into countless motes of light, fading into the night wind.
Rin landed lightly atop a remaining boulder.
The first light of dawn broke through the clouds, illuminating his black haori.
In his mind, the crisp notification of the system rang out repeatedly, filling his vision.
(Next World: Jujutsu Kaisen)
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