The Greatest Assassin Gets Reincarnated in Tensura

Arion appeared in the ruins of the fallen kingdom, his presence unnoticed, his gaze locked onto the spectacle before him. The air twisted and burned, space itself warped, and an overwhelming surge of demonic energy threatened to consume everything.

At the center of it all—Guy.

His transformation was reaching its peak, magicules expanding without limit, his very existence rewriting itself.

Arion watched calmly.

This was nothing new to him.

He had undergone the same evolution long ago, felt the same surge of power, the same intoxicating rise beyond mortal limits. He knew exactly what Guy was experiencing.

The arrogance.

The euphoria.

The delusion of invincibility.

Arion smirked.

"He thinks he's untouchable now."

That was always the first mistake of those who evolved. They believed power alone made them supreme.

But power was merely a tool.

And supremacy… was a matter of perspective.

As Arion observed, something shifted in the world beyond mortal perception. A force older than time itself stirred.

Someone else was watching.

Veldanava.

The Star Dragon.

The Creator of the Cardinal World.

The Elder Brother of the True Dragons.

The Strongest Being in Existence.

But he was not watching only Guy.

His golden eyes were mostly focused on Arion.

For a being like Arion to exist as he did… was an anomaly.

A mystery even Veldanava did not fully understand.

And so, the Creator watched… waiting to see what this enigmatic entity would do next.

------

The newly evolved True Demon Lord stood amidst the ruins of the once-great kingdom he had obliterated, his very presence warping the air around him. His crimson hair swayed unnaturally, unholy flames flickered around his fingertips, and his aura—though newly awakened—was already a force that could bring civilizations to ruin.

His senses had never felt sharper, his body never so powerful.

"This… this is true power."

For the first time in his long existence, he felt like he had become something more than a primordial demon.

As he relished in his newfound strength, a touch.

A simple, light touch on his shoulder.

The moment it happened, his entire body locked up.

Impossible.

His instincts screamed—danger, predator, unknown.

For the first time in his life, he felt fear.

Before he could react, a voice spoke, calm, deep, and yet carrying an undeniable weight of judgment.

"Now that you have evolved… you have gained power you never imagined existed...what will you do with this power.... in this world?"

The voice carried no hostility, no emotion.

But there was something worse than hostility—certainty.

"Before you answer, think carefully… because your response will determine your fate."

Guy's mind spun at a terrifying speed.

Who? How? Why?

He had just evolved into a True Demon Lord. He had acquired incomprehensible power. He should be unapproachable, untouchable!

Yet this being… this entity had gotten close without him noticing, touched him without him reacting, and now stood behind him like a judge passing sentence.

Guy swallowed, his fingers twitching with the urge to summon a spell, a barrier—anything.

But he resisted.

A true predator does not show its throat.

Slowly, carefully, he turned to face the intruder—only to see him standing twenty feet away.

The man was tall, draped in a dark cloak, his face… unfamiliar.

Guy had never seen him before. Never heard of him.

And yet—

Everything inside him screamed, "Danger."

There was no aura, no presence, no distortion in space around this being—it was as if he did not exist.

And that was terrifying.

For Guy, who had spent countless eons in the Underworld, who had stood among the strongest, who had never once faltered in pride—this was the first time he truly felt the unknown.

But he was still a demon.

And he was still prideful.

His lips curled into a smirk, suppressing the unease creeping through his core.

"Who the hell do you think you are?"

His voice came out smooth, confident—like a king addressing a subject.

"You touch me, threaten me, and act as if my fate is in your hands? Do you have any idea who you're talking to?"

His eyes glowed menacingly, his aura finally unleashing, turning the very ground to cracked, molten stone.

"I am Guy, the pinnacle of demonkind, the strongest among primordials, the ruler of destruction."

He took a slow step forward, his mere movement distorting reality.

"And I do not take orders."

Silence.

The figure did not move.

Did not flinch.

It was as if Guy's overwhelming power meant nothing.

And then—

The stranger smiled.

And everything shattered.

The space around Guy cracked like glass, the air turned thick and suffocating, and an unseen force crashed down on him like the weight of an entire world.

His knees buckled.

Just for a second.

But it was enough.

It was enough for Guy to understand.

This was not just anyone.

This was not some arrogant fool testing his strength.

This was someone above him.

And he had no idea who they were.

For the first time, he had met a being he could not measure.

The figure tilted his head slightly, his smile never fading.

"A bold answer. But power without purpose is nothing but ruin."

His golden eyes gleamed, and Guy felt something digging into his very soul.

"You call yourself the strongest… but do you even know what true power is?"

Guy grit his teeth, his pride demanding he respond—but no words came.

Because deep down, in the furthest reaches of his being, in the part of him that still understood fear…

He knew.

He was not the apex predator in this moment.

He was the prey.

A being who had just awakened to a new

level of power, believing himself to be

unstoppable.

And yet, in this moment, he was on his knees.

Not from battle.

Not from injury.

But from something far worse.

A presence—an unfathomable, crushing force.

Not an aura.

Not killing intent.

Just… existence.

A presence so vast, so overwhelming, that it drowned him.

For the first time since his creation, Guy felt powerless.

He clenched his fists, his razor-sharp nails digging into his palms, drawing blood. He refused—refused to accept this.

His entire being screamed at him to resist, to stand, to fight.

But his body would not move.

His pride was shattering.

He lifted his head, his glowing crimson eyes narrowing as he stared at the figure before him.

And yet—

He could not see his face.

It was blurred, obscured, unknowable.

A being hidden from even his demonic perception.

A being that did not want to be known.

A shadow.

A phantom.

A judge.

Then, that voice came again—calm, collected, but carrying a weight that felt as if the world itself had turned against him.

"I will ask you one last time."

A pause.

Guy could feel his very soul shaking.

"What will you do with this power? In this world?"

A question.

A demand.

A sentence waiting to be carried out.

Guy's mind raced.

His entire life, he had ruled through raw strength. He had brought empires to ruin, turned kingdoms into ash, stood as a supreme force of chaos, because that was what he was—a demon, a predator.

That was how the world worked.

The weak were consumed. The strong ruled.

And now, in this moment, he realized—

He was not the strongest.

He had never been the strongest.

His fingers twitched as he fought against the weight crushing him, his demonic instincts demanding defiance.

His pride roared.

Stand. Answer with arrogance. Assert dominance.

But his instincts—his primal instincts that had kept him alive for eons—whispered another truth.

Submit.

Lie. Say what he wants to hear. Survive.

Because this was not a being to challenge.

A cold sweat formed on his back.

His lips trembled—but he forced them into a cocky smirk.

Even in the face of impossible power, he would not break.

His voice came out, smooth but strained.

"What will I do with this power?"

He let out a small, forced chuckle.

"Simple. I will rule. I will take everything, shape the world as I see fit, bend it to my will. That is what power is for."

He watched carefully.

Watched for any reaction from this entity that stood above him.

And then—he felt it.

A shift.

The pressure—it increased.

It was unbearable.

The weight of a thousand collapsing worlds.

The suffocating force of something beyond his comprehension.

He felt his bones creak.

His vision blurred.

His soul trembled.

And then—

A whisper.

A whisper that carried more weight than a thousand armies marching toward their doom.

"Wrong answer."

Guy's entire body screamed in agony.

His pride shattered.

His arrogance meant nothing.

Because in the face of true power, his rule, his ambitions—were insignificant.