The Greatest Assassin Gets Reincarnated in Tensura

Then he stayed with Noir in his territory, deep within the vast and enigmatic domain of the Primordial Black. For years, he trained relentlessly under Noir's guidance, honing his combat skills, perfecting his magic, and mastering the nature of demons.

During this time, he fought countless battles with Noir, each one more intense than the last. Noir was merciless, never allowing him even a moment of respite. Every spar pushed him beyond his limits, forcing him to adapt, learn, and evolve at an unnatural pace.

He learned the fighting style of high-ranking demons, incorporating their fluid movements and unpredictable attacks into his own. He learned how demons lived, how they viewed the world, and how they thrived in the shadows of existence.

Noir also educated him on the other Primordials—the ancient, supreme demons who ruled over their respective domains.

- Rouge (Primordial Red): A warrior of unmatched destruction.

- Vert (Primordial Green): A strategist and manipulator.

- Jaune (Primordial Yellow): A master of curses.

- Bleu (Primordial Blue): A cold and calculating entity.

- Violet (Primordial Violet): The most enigmatic of them all.

-Blanc (Primordial blanc): charismatic and calculating

He learned that demons were not simple creatures of malice—they were beings of law and contract, bound by power and hierarchy.

Over time, his abilities grew to frightening levels.

- He developed resistances he never had before:

- Holy-Demonic Resistance: The ability to endure and counteract both divine and infernal energies.

- Mind Interference Resistance: He became immune to charm, confusion, and fear-based magic.

- Spatial Disruption Resistance: No longer could space-locking magic restrain him.

- He acquired new extra skills, augmenting his already formidable arsenal:

- Shadow Step:The ability to instantly travel through darkness and shadows.

- Demonic Conversion:Allows him to convert any form of energy into demonic energy, increasing his regeneration and attack power.

- Magic Sense - Demon Variant: A heightened version of magic sense that allows him to perceive the world **through energy fluctuations and emotions, even predicting movements.

He even began dabbling in Holy Magic, something most demons found difficult, learning how to neutralize divine attacks rather than simply resisting them.

One day, after years of training, he and Noir decided to fight without holding back.

The entire battlefield was shrouded in darkness as they clashed—flashes of abyssal flames, distortions in space, waves of pure destruction rippling through the air.

Noir moved like an untouchable phantom, weaving between attacks, countering every move with effortless grace.

But the nameless demon was different now.

His reactions were sharper, his instincts near-perfect, his control over magic flawless.

They fought like equals—a testament to his growth.

Then—

**The Voice of the World echoed.**

<< The individual 'Nameless Demon' has reached the required experience and strength to evolve into an Archdemon. >>

His eyes widened in shock. "What…?"

<< Evolution to Archdemon… beginning. >>

Suddenly, his entire body shut down.

His limbs felt like they were bound by invisible chains, his vision darkened, and an overwhelming drowsiness took over.

His mind screamed at him. Not now. Not in the middle of battle.

"Lara! What's happening?" he demanded internally.

Her voice was calm yet urgent. "You are evolving into an Archdemon. Your body is undergoing complete reconstruction. This is natural."

He gritted his teeth. No. He refused to lose consciousness here.

With sheer willpower, he forced his body to remain standing.

The air vibrated violently around him as his very being underwent a metamorphosis.

Noir, who had paused upon sensing the change, watched with growing interest. "…To resist an evolution of this magnitude…? Truly remarkable."

Then, the Voice of the World continued.

<< Reconstruction of the body to an Archdemon body… Confirmed. >>

An explosion of power erupted from within him.

His entire existence was redefined.

<< All physical abilities have been exponentially enhanced. >>

<< Magic capacity has increased by 500%.>>

<< New abilities acquired.>>

The pain was gone.

Instead, a rush of power unlike anything he had ever felt surged through him.

His senses expanded.

He could see every single energy fluctuation in the air, feel the very fabric of space trembling, hear the distant echoes of magic itself.

Noir's eyes shone with approval. "Ah… You have truly evolved."

The nameless demon clenched his fists—his new strength surging through him like an unbreakable tide.

He exhaled, a slow smirk forming.

"Let's test this out."

As the wave of his evolution settled, the battlefield remained silent for only a moment. Then, the air cracked as the evolved Archdemon vanished from sight, reappearing right in front of Noir in an instant.

Noir barely had time to react as a shadow-forged fist slammed into him, sending him skidding backward. The impact shattered the ground beneath him, creating a deep crater from the sheer force alone.

Noir's eyes gleamed with excitement. "Oh? This is getting interesting."

He straightened himself and flicked the dust off his coat, but the nameless demon was already on him again.

His movements were smoother, faster, and sharper than ever before.

His Abyssal Devourerskill was now more refined, allowing him to absorb magic from the surroundings with every strike. His attacks didn't just deal damage—they eroded energy itself.

His Sovereign of Shadows ability had evolved as well. He wasn't just blending into the darkness—he was the darkness. His shadow extended unnaturally, forming tendrils that slashed at Noir from impossible angles.

Noir dodged, his usual calm demeanor shifting into focused combat mode.

"Now you're starting to look like a proper Archdemon."

The two clashed again, their fists colliding and sending out shockwaves that tore through the landscape.

For the first time in a long while, Noir had to push himself.

He conjured a massive black inferno, intending to burn his opponent to ash. But the newly evolved Archdemon devoured the flames with Abyssal Devourer, absorbing the demonic energy into himself.

Noir's smirk widened.

"You absorbed my Hellfire? How greedy."

The nameless demon didn't reply. He had already closed the distance, appearing behind Noir in an instant. A black blade—forged from pure shadow energy—formed in his hand.

A single slash.

Noir barely dodged, but a cut still formed on his cheek—the first wound he had received in their countless battles.

He touched the cut, looking at the blood on his fingertips. Then, he laughed.

"Ah, I see. You've finally stepped into the realm of true monsters."

Noir's demonic aura flared. He was done holding back.

The battle intensified to a terrifying degree.

Reality itself warped around them. The sky above twisted into a chaotic maelstrom, the ground crumbled beneath their feet, and their clashing energy caused dimensional distortions.

But despite Noir's overwhelming might, the Archdemon kept up with him—matching him blow for blow.

He wasn't just stronger.

He was adapting.

Every moment that passed, he learned more about Noir's techniques. His movements became more precise, his counterattacks sharper, his magic control near-flawless.

Noir's eyes gleamed in admiration. "You truly are something special."

After what felt like an eternity of battle, Noir finally raised a hand, signaling a halt.

The nameless demon stopped, his breathing steady, his magic still surging.

Noir chuckled. "That's enough. I've seen enough."

The Archdemon walked forward, his steps steady, his power more refined than ever. Noir, standing before him, observed him with his usual smirk, but his gaze held something deeper—curiosity, approval, and perhaps a sliver of intrigue.

"You've come far," Noir finally said, arms crossed, his red eyes gleaming. "Your evolution has granted you overwhelming strength, and your mastery over magic is remarkable. If it were just about raw power, you would already be among the strongest demons in existence."

The Archdemon remained silent, watching Noir carefully. He knew there was more to this conversation.

Noir let out a soft chuckle. "But strength alone isn't enough. What truly matters is purpose."He took a step closer, eyes narrowing. "What do you seek? What is your goal?"

The Archdemon didn't flinch, though deep inside, he felt something stir. His mission was clear—to control the world from the shadows, to manipulate events unseen, to shape reality itself without anyone ever realizing he was the one pulling the strings. But that was a truth he would keep to himself.

Instead, he simply said, "I seek to grow stronger, to carve my own path."

Noir tilted his head slightly, as if analyzing him, before a slow smirk formed on his lips. "Hoh? Is that so?"

The Archdemon kept his expression neutral. He would not reveal his true intentions. Not yet.

Noir chuckled again. "Well, whatever your goal is, you're certainly strong enough to pursue it. But what you lack now isn't power—it's battle experience. The kind you won't gain by just training in one place. You need to fight real enemies, powerful ones, unpredictable ones. Only then will you truly refine yourself."

The Archdemon nodded, already knowing this to be true. To control the world from the shadows, he needed to understand it first. That meant seeing more, learning more, manipulating more.

After a moment, he looked at Noir and said, "I understand. It's time for me to go."

Noir smirked. "Oh? You're leaving already?"

"I've learned much from you," the Archdemon said, his tone calm. "But my journey is far from over. If we meet again, I will be even stronger."

Noir's smile widened. "I certainly hope so. Anything less would be a disappointment."

The Archdemon turned, his dark cloak billowing as he prepared to step into the unknown. Lara's voice echoed in his mind, her calculations already running as she planned their next move.

And with that, he vanished into the shadows, unseen and unknown—just as he intended.