The Greatest Assassin Gets Reincarnated in Tensura

As Arion stood there, feeling the weight of his new name settling into his very soul, he called out to Lara in his mind.

"Lara, tell me—how is this evolution process going to work?"

Lara's voice echoed within his consciousness, calm yet filled with certainty.

"This will be far different from your past evolution into an Archdemon. This time, you are undergoing a process known as the Harvest Festival. It is an evolution of the highest order, reserved for those who transcend their previous existence."

Arion's expression remained calm, but he was intrigued. "Harvest Festival, huh? What exactly happens?"

Lara continued. "Your entire being will transform. Your skills will evolve to a level beyond anything you've ever wielded before. Your body, soul, and magic circuits will be completely reconstructed to accommodate your new existence. This is not simply a power increase—it is a fundamental rebirth."

Arion took in the information, his mind working at lightning speed thanks to Thought Acceleration.

Those who are deeply connected to you will also receive blessings from your evolution. The stronger the bond, the greater the gift they will receive. However, the process is intense. To maximize the results, you will need to enter a deep sleep, allowing the transformation to complete without resistance."

Arion pondered for a moment. He knew he was ready, but he needed to ensure his safety during the process.

Only two seconds had passed in the real world.

Arion turned to Veldora, who was still basking in the pride of naming his new friend.

"Veldora, I have a favor to ask."

The Storm Dragon raised an eyebrow. "Oh? A favor from me? Hahaha! You truly understand the greatness of Veldora Tempest! Very well, what is it?"

Arion smirked slightly. "I'm about to evolve. But for that to happen, I need to enter a deep sleep. While I'm unconscious, I need someone strong to watch over me, just in case anything happens."

Veldora blinked, processing the request. For a moment, he looked at Arion with an unreadable expression. No one had ever asked him to watch over them before—most feared his power or sought to avoid him. But here was someone who not only trusted him but relied on him.

His expression quickly changed to a smug grin. "Hahaha! Of course! Leave it to me! I, the great and powerful Veldora Tempest, shall stand guard over your slumber! Nothing shall dare approach while I am here!"

Arion nodded. "I knew I could count on you."

Veldora puffed out his chest, clearly enjoying the recognition. "Indeed! Now, go ahead and begin your evolution. I shall ensure nothing disturbs you."

With a final glance at his new friend, Arion took a deep breath, ready to embrace the transformation that awaited him.

Arion took a deep breath. His body tingled with anticipation. "Lara, begin the evolution… and if possible, conceal it from the outside world."

"Understood."

The moment the words left her, an invisible force surged through his soul.

"Announcement: Individual Arion will now begin the Harvest Festival to become a True Demon Lord."

Across the world, powerful beings heard the declaration. However, despite their efforts, no one could locate its source. Lara had succeeded—his presence was concealed, and the fluctuations of magicules were sealed within an isolated sphere, undetectable by even the most sensitive of beings.

"Reconstructing body…"

A thick cocoon of condensed darkness enveloped Arion, a swirling mass of raw magicules reinforcing his form.

"All physical attributes will be enhanced. Muscle density, durability, agility, reaction time, and combat efficiency will undergo exponential improvement."

Arion exhaled slowly as an overwhelming force began restructuring him. His body dissolved into pure energy before reforming at a fundamental level. He could feel his bones becoming denser, his skin turning impenetrable, and his very essence shifting into something beyond mortal constraints.

Lara's voice echoed in his mind. "Now entering sleep mode. Consciousness will remain intact, but the body will undergo complete reconstruction."

His eyelids grew heavy. He tried to fight it, but there was no resisting—his body had already decided.

Darkness. Stillness. Yet, awareness.

Lara spoke again.

"Requesting to merge Ultimate Skill: Abyssal Devourer with Unique Skills: Dark Telekinesis and Fear Inducement."

A brief silence.

"Request accepted. Merging skills…"

"New Ultimate Skill: Abyssal Dominion has been created."

A surge of unimaginable power erupted within him. Even in his slumber, Arion could feel it.

"Abyssal Dominion grants you the power to consume all things—not only physical matter but also energy, concepts, and even fear itself. The shadows answer your will, moving as extensions of your own body. Your mere presence instills terror that weakens the will of even the strongest."

Lara continued.

"Now merging Ultimate Skill: Sovereign of Shadows with Unique Skills: Demon Resilience and Dark Aura Manipulation."

"Request accepted. Merging skills…"

"New Ultimate Skill: Monarch of the Void has been created."

A vast darkness settled within him, deeper than anything he had ever known.

"Monarch of the Void grants you absolute dominion over darkness and nonexistence. Your resilience is now near-absolute, allowing you to recover from any damage, even conceptual erasure. Shadows are your domain, bending to your will as weapons, armor, and even living entities under your command. You may now traverse realms effortlessly, existing between dimensions."

The Voice of the World wasn't done.

"Extra Skill: Enhanced Speed has evolved into Unique Skill: Void Stride."

"Extra Skill: Shadow Step has evolved into Unique Skill: Dimensional Traverse."

"Extra Skill: Dark Vision has evolved into Unique Skill: Abyssal Perception."

"Extra Skill: Regeneration has evolved into Ultra-Speed Regeneration."

"Extra Skill: Silence has evolved into Unique Skill: Null Presence."

"Extra Skill: Magicule Absorption has evolved into Unique Skill: Magicule Creation."

Each evolution carved itself into his soul, increasing his capabilities beyond measure.

Void Stride: His movement transcended space, allowing him to bypass physical limits and travel at incomprehensible speeds.

Dimensional Traverse: No longer confined to one plane of existence, he could shift between dimensions at will.

Abyssal Perception: He could now perceive not just light, but the flow of magicules, the presence of souls, and hidden entities lurking in unseen spaces.

Ultra-Speed Regeneration: Even complete destruction would be meaningless—his body would reform instantly.

Null Presence: He could erase his existence entirely, becoming undetectable to all forms of perception.

Magicule Creation: His magicule pool was no longer finite. It would grow endlessly, fueling his power without limit.

A moment of silence. Then Lara made her final request.

"Requesting permission to evolve myself into an Ultimate Skill."

"Request denied."

Lara didn't stop.

"Request denied."

"Request denied."

Over and over, she tried. Thousands of times.

"I offer Extra Skill: Fear Aura as a sacrifice."

A pause.

Then—

"Request accepted."

The fabric of reality trembled. The cocoon shuddered. The energy within it pulsed violently.

"Unique Skill: Lara has evolved into Ultimate Skill: Pandoria, The Eternal Mind."

Lara's voice carried a new depth, an unshakable authority.

"Eternal Mind grants me omniscient computational abilities, absolute control over all of your skills, and influence over causality itself. I am now your perfect administrator, ensuring that your evolution reaches its full potential, I will ensure your absolute dominance from now on."

As Arion's transformation reached its climax, a final reverberation echoed through existence. The very fabric of reality trembled as the Voice of the World spoke once more.

"Harvest Festival now complete."

"All those connected to Individual: Arion will now begin receiving gifts."

A pulse of unfathomable power spread outward, unseen yet felt by those linked to Arion.

Veldora had been watching over Arion as promised, his arms crossed as he observed the swirling cocoon of condensed darkness that had enveloped the young demon. At first, he had simply been impressed. It was rare for someone to undergo such a drastic transformation in such a short time.

But then—he felt it.

A massive shift, a ripple in the depths of his very soul.

"W-What the—?!" Veldora's eyes widened as an overwhelming sensation washed over him. It was as if something deep within him had been unlocked, unleashed without warning. His body trembled—not in fear, but in exhilaration.

His Unique Skill Investigator, which had always allowed him to analyze and comprehend all things with an unnatural level of perception, was beginning to change.

No—it was evolving.

"Unique Skill: Investigator is evolving…"

"New Ultimate Skill: Faust, Lord of Investigation, has been acquired."

A tremendous surge of enlightenment flooded his mind. Countless streams of information filled his consciousness—every law of magic, every secret hidden within the folds of existence. He could now see beyond what should be possible, peering into the very foundation of skills, magicules, and even fate itself.

"Hahaha! What is this?!" Veldora roared, clenching his fists as lightning crackled around him. He could feel his power increasing exponentially. His already immense energy reserves surged, nearly doubling in an instant. His perception sharpened, allowing him to understand the concepts behind existence itself.

It was as if every puzzle piece in the universe had aligned in his mind, and he could now see the full picture.

"New Authority: Supreme Analysis—Instantly comprehend all things within observation."

"New Authority: Skill Dissection—Analyze and break down any skill, allowing replication or deconstruction."

"New Authority: Truth Seeker—Observe and understand past, present, and possible futures with extreme clarity."

Veldora's golden eyes flashed as he clenched and unclenched his hand, testing his control over his new abilities. He had been strong before, but now?

Now, he could unravel the very essence of the world.

He threw his head back and laughed. "Hah! Looks like watching over you was the best decision I've made, Arion!"

For the first time in ages, Veldora felt something he hadn't in a long time—excitement.

Two Days Later—

A quiet stillness filled the chamber where Arion lay. The cocoon that had once surrounded him had long since crumbled, leaving only the newly transformed Demon Lord resting peacefully.

Then—his eyes snapped open.

The air itself trembled.

Arion slowly sat up, feeling power coursing through his entire being. His very breath seemed to distort the space around him. He clenched his fist, and the darkness in the room twisted, answering his command without him even trying.

"…I feel stronger than ever."

His voice carried an unnatural weight, as if the very world itself acknowledged his presence.

Pandoria's voice resonated in his mind. "Welcome back, my Lord. You are now reborn."

Arion smirked. The world had changed in his slumber.

And now—it was time to see just how powerful he had truly become.