The Greatest Assassin Gets Reincarnated in Tensura

The Cardinal World had long been a battlefield of egos and power struggles. Guy Crimson and Rudra continued their endless game, a battle waged across centuries, moving pieces, shaping nations, and testing their might against one another. But to Arion, this was becoming a nuisance.

Despite Guy's status as the oldest Demon Lord and one of the most powerful beings in existence, he had a bad habit—a cruel amusement of sending his demons to terrorize nations, causing destruction, fear, and unnecessary bloodshed. What was once just a scare tactic had escalated into mindless carnage.

This infuriated Arion.

And he had decided—it was time to put an end to it.

Arion stood in the grand throne room of the City of Eternal Night, his presence alone casting an ominous weight in the air. His white hair shimmered like the moon, his majestic aura suffocating yet beautiful, and his eyes glowed with an unfathomable depth of power. The air was thick with an unexplainable darkness, a reality-shattering force that bent to his very will.

Before him stood his most trusted and deadliest warriors—Diablo, Testarossa, Carrera, and Ultima.

The Primordials, the greatest of demon kind, had long followed Arion, serving him as generals, enforcers, and executioners. They had waged wars, destroyed civilizations, and conquered countless realms in his name. But today, their mission was different—today, they were to eliminate Guy Crimson.

A moment of silence lingered as Arion spoke, his voice calm but absolute.

"Guy has crossed the line." His words echoed across the throne room.

"He has become a nuisance. His endless games and reckless destruction irritate me. He must be removed."

The Primordials exchanged glances, surprised but thrilled at the same time. Guy Crimson, the so-called strongest Demon Lord, was finally going to pay for his arrogance.

Diablo, ever the devoted and cunning strategist, grinned darkly.

"My lord, do you wish for us to end him swiftly or should we make him suffer?"

Testarossa flicked her hair, a cold smirk forming on her lips.

"It's been a while since we had a proper challenge. I wouldn't mind breaking him piece by piece."

Carrera, the most battle-hungry, cracked her knuckles, excitement flashing in her golden eyes.

"Ohhh, this is gonna be fun. I'll blast him to bits and scatter his remains across dimensions!"

Ultima giggled, her voice sickeningly sweet yet filled with malice.

"I wonder if he'll scream? Maybe we should take our time and see how much he can endure."

Arion raised his hand, silencing them.

"This battle will not take place in the Cardinal World." His gaze darkened.

"A fight of this scale would shatter continents. I will transport him to my personal dimension. There, you will go all out."

The Primordials let out grins of anticipation.

It was time.

Far away, in the Ice Continent, Guy Crimson sat on his grand balcony, wine in hand, his posture relaxed. Across from him, Velzard, his beloved elder True Dragon sister, sat with her own glass, the two enjoying a quiet evening.

"You know, Guy," Velzard mused, swirling her wine.

"You really do cause too much trouble. You don't think your little 'games' will get you into serious trouble one day?"

Guy chuckled, his crimson eyes gleaming with mischief.

"Trouble? Please. Who in their right mind would dare go against me?"

And then, everything changed.

Without warning, a suffocating force wrapped around Guy's very existence.

The world around him twisted and shattered, his surroundings melting like illusions. Velzard's voice called out in alarm, but it was already too late—Guy Crimson had vanished.

Guy opened his eyes, and the landscape before him was unrecognizable.

A vast, endless void of swirling galaxies and shattered realities stretched around him. Floating black towers pierced the sky, pulsating with an eerie crimson glow. The ground was an obsidian battlefield, forged from the remnants of fallen dimensions.

"Where the hell am I?" Guy muttered, trying to teleport back—but he couldn't. Something blocked him.

Then, a voice—deep, omnipresent, powerful beyond comprehension.

"Guy Crimson. You have crossed the line."

Guy snapped his head up, eyes narrowing.

"Who the hell are you?! Show yourself!"

Then, shadows moved.

One by one, they stepped into the light.

First, Diablo, his signature grin twisting with anticipation, his golden eyes gleaming like a predator sizing up his prey.

Then, Testarossa, her ice-cold beauty masking a killing intent so intense it could freeze time itself.

Next, Carrera, already cracking her fingers, electric sparks dancing around her as she struggled to contain her excitement.

And finally, Ultima, innocent-looking yet horrifying, her energy pulsating with raw, chaotic destruction.

Guy smirked.

"Oh? So, the Primordials are here to fight me?" He crossed his arms, exuding confidence.

"I don't know who sent you, but I hope you realize—you're all out of your depth."

Diablo chuckled.

"Oh, Guy…" he whispered, stepping forward. "You have no idea how much we've evolved."

Testarossa's eyes glowed.

"You were once the pinnacle of power… but now? You're nothing but a relic of the past."

Carrera sneered.

"I hope you scream, Crimson. I really do."

Ultima giggled.

"Let's see how long you last, shall we?"

And then—

The battle began.

Guy barely had time to react as Diablo blurred forward, striking with a force that shattered the very fabric of space.

BOOM!

Guy blocked the attack, but Testarossa followed up instantly, a slash of white-hot energy cutting across the battlefield.

Carrera unleashed a barrage of annihilation blasts, the very essence of destruction tearing through Guy's barriers like paper.

Ultima, laughing maniacally, flooded the realm with a sea of purple flames, warping reality itself.

For the first time in centuries, Guy felt overwhelmed.

His body burned, his barriers cracked, and for the first time—he realized:

"They… they're stronger than ?!"

And above them, watching with a smile, was Arion—his plan unfolding perfectly.

----____----

The Crimson Execution – The Fall of Guy Crimson.

The void of shattered dimensions trembled, its very fabric torn apart as Guy Crimson clashed against four of the deadliest beings in existence. This was no ordinary battle.

This was an execution.

And yet, Guy did not yield.

His crimson hair whipped wildly in the chaotic winds, his golden eyes burning with fury. He gripped his sword tightly, the legendary Crimson Moon, a blade forged from the essence of destruction itself. The strongest Demon Lord would not go down without a fight.

But this time… he was not fighting mindless demons or arrogant challengers.

He was facing Diablo, Testarossa, Carrera, and Ultima—four Primordials trained by Arion himself.

This was different. This was war.

The Primordials moved like shadows, not attacking all at once but weaving through space, appearing and disappearing in an intricate dance of death.

They didn't fight like before.

Their old battles had been filled with pure destruction, overwhelming force, and arrogant displays of power.

Now?

Every move was calculated.

Every strike had the intention to kill.

Every attack was a death sentence.

Arion had forged them into assassins.

A flicker—Diablo vanished.

Then—

SLASH!

Guy barely parried a black dagger laced with abyssal flames, Diablo's attack cutting across his side faster than sound itself. The pain barely registered before—

BOOM!

Testarossa materialized behind him, her blade wreathed in frozen destruction, slashing upward in a perfect arc. Blood sprayed into the void.

Guy growled, twisting mid-air, but before he could counter—

Carrera was already above him.

"Too slow, Crimson!"

She thrust her palm forward, an orb of golden annihilation forming in an instant.

Guy's instincts screamed—this attack would erase him from existence.

With no time to dodge, he swung Crimson Moon downward, unleashing a crimson shockwave so powerful it split the entire battlefield in half.

BOOOOOOM!

The blast collided with Carrera's energy, but—

Ultima had already moved.

Her delicate fingers traced a sigil in the air, a vortex of dark matter blooming behind Guy.

A trap.

Too late.

The vortex sucked him in, distorting space. For a split second, he lost control of his movement—

And Diablo struck.

A black spear materialized in his hands.

"You're getting predictable, Guy."

SHLIIIKK!

The spear punched through Guy's left shoulder, bursting out the other side.

"GRAAHH!!"

Guy roared, his aura flaring like an inferno. With a violent twist, he shattered the vortex's hold, ripping the spear out and countering in one motion.

"ENOUGH!"

A single swing of Crimson Moon—

The entire battlefield cracked.

A colossal crimson shockwave erupted outward, twisting like a serpent of destruction, forcing the Primordials back.

Guy landed on the floating remains of a broken tower, panting. His wounds already regenerating.

"You bastards think I'll go down so easily?" He smirked, licking his lips.

"Let's see how you handle this!"

His golden eyes flashed, his aura twisting—

And then, it happened.

A dark pure golden light formed above his head. His body pulsed with a powerful energy.

"Ultimate Skill – Lucifer, Lord of Pride!"

The battlefield shook violently.

Lucifer—the ability to analyze, copy, and perfect any skill he witnessed.

And he was going to steal theirs.

"Heh… I'll take everything from you and use it against you."

His eyes locked onto Diablo—attempting to copy his movement.

Then, Arion's voice echoed from above.

"No."

A force beyond comprehension struck Guy's soul—

CRACK!

His body seized, his skill faltering.

His mind reeled in horror.

"What…?!"

"You will not copy them," Arion's voice declared. "I will not allow it."

For the first time in centuries, Guy felt true fear.

His ultimate skill was rendered useless.

"Tch… then I'll just kill you all the old-fashioned way!"

Guy dashed forward. Faster than light.

His sword became a blur, the Crimson Moon flashing with unstoppable fury.

Diablo met him mid-air, their blades clashing in a flurry so fast it tore apart space itself.

SLASH—CLANG—BOOM!

Testarossa weaved around the chaos, her sword striking from blind angles, forcing Guy to keep up.

Carrera hovered above, her hands glowing with pure destruction magic, raining down pulses of annihilation.

Ultima warped through shadows, striking when Guy least expected it, her attacks leaving deep gashes across his body.

Every second, Guy was being pushed further and further back.

He was losing.

"ENOUGH!!"

Guy unleashed everything.

A single slash so powerful it severed the very concept of reality.

The Primordials dodged—except one.

Carrera stood her ground, grinning wildly.

"Come at me, Crimson!"

Her hands pushed forward—

A golden sphere of annihilation formed in her palms.

The very concept of existence collapsed around it.

"Final Judgement!"

Guy's Crimson Moon clashed with the sphere—

BOOOOOOOOOOOOOOOOOM!

The entire dimension trembled.

The light swallowed everything.

Silence.

When the dust settled…

Guy Crimson fell.

His body broken, bloodied, and drained of strength.

Diablo stood over him, his golden eyes filled with amusement.

"You were strong, Guy… but we were better."

Testarossa knelt beside him, whispering.

"This is the end, Crimson King."

Carrera laughed, wiping blood from her face.

"Damn, that was fun."

Ultima giggled, nudging his body.

"He's still alive? Should we finish him?"

Above them, Arion watched with satisfaction.

The execution was over.

The strongest Demon Lord had fallen.

Ultima crouched beside Guy's broken body, her violet eyes glowing with sadistic glee. The strongest Demon Lord… now at her mercy.

"Tsk, tsk. You had a good run, Crimson."

She raised her hand, fingers glowing with pure annihilation magic—power that didn't just kill, but erased the very concept of existence.

"But all things must end."

Guy's golden eyes flickered weakly, his smirk barely holding as blood dripped from his lips.

"Hah… guess I finally… lost…"

Ultima's expression twisted into a grin.

"Damn right you did. And now—"

With a single motion, she plunged her hand into his chest, gripping his core.

Guy grunted, but there was no strength left to resist.

Ultima's magic surged.

A violent purple-black light consumed his body, his very essence unraveling.

"Goodbye, Crimson King."

SHHHHHHHHK!

With a final, devastating burst of pure erasure, Guy Crimson disintegrated.

His soul shattered. His existence erased.

The Crimson King… was no more.

The battlefield fell silent.

Diablo, Testarossa, Carrera, and Ultima stood in the aftermath, watching as the last traces of Guy's existence vanished into the void.

"That was easier than I expected," Carrera muttered, cracking her neck.

"He put up a fight," Diablo countered, his golden eyes gleaming. "But in the end… he was outmatched."

Ultima giggled, wiping blood from her hands.

At that, Arion finally spoke.

"He will resurrect."

The Primordials turned to him, their expressions shifting.

"Wait—what?" Testarossa narrowed her eyes. "You're letting him come back?"

Arion's gaze was cold, absolute.

"I could prevent it. I could erase him completely.

But I won't.

"He will return in a few hundred years… weakened, changed.

"And when he does, he will remember this day."

The words carried weight.

This wasn't mercy.

This was a lesson.

A punishment.

A warning.

Guy would return… but things would never be the same.

When that day came, the world would be different.

And he would finally understand.