One Piece: Starting with Sharingan, First Mate Uchiha

Victor reached out and pushed open the incredibly heavy steel door in front of him.

Accompanied by the dull creaking of the door hinges, he followed a steep set of stone steps leading down to a spacious training ground deep underground in Baltigue.

The moment you step inside, a chilling and wild aura hits you.

By the light of the torches burning on the surrounding walls, one can clearly see that the hard rock walls are covered with all kinds of terrifying claw marks and bottomless slash marks.

The crisscrossing marks seemed to silently demonstrate the formidable strength of the place's owner.

In the center of the training field, Sabo, shirtless, was performing a high-intensity one-finger push-up that was unimaginable to ordinary people.

Sweat trickled down his strong, well-proportioned muscles, covered with tiny scars, and dripped onto the dry stone slab.

Upon hearing the door open, Sabo immediately stopped what he was doing and nimbly flipped himself to his feet.

He grabbed a towel draped nearby and wiped the sweat from his face.

When he saw that the person who came was Viktor, his blue eyes instantly ignited with a fervent fighting spirit.

"You've come, Guren."

Sabo grinned at Viktor, revealing two rows of white teeth.

As he flexed his wrists, he said earnestly:

"Although you used that incredible ability to help me regain the most important memories for me, in a way, I owe you my life."

Sabo abruptly changed the subject, his eyes becoming incredibly sharp:

"However, in the upcoming intense training, as the Chief of Staff of the Revolutionary Army, I will absolutely not hold back in the slightest!"

"If you, First Mate, are only as capable as you claim in the newspapers, I really might kill you!"

Faced with this pre-battle declaration that was half reminder and half provocation, Viktor smiled calmly and replied indifferently:

"Killing me, even for you, might be a little difficult."

The atmosphere between the two was tense and ready to erupt at any moment, but they did not immediately make a move.

"Come with me."

Sabo turned around and led Viktor to a huge, specially made steel rock at the edge of the training ground.

This rock is much harder than ordinary steel and was specifically used to test destructive power.

"To master internal sabotage, you must first understand its nature."

Sabo took a deep breath and began to explain the core principles of advanced Armament Haki to Viktor:

"Most people's understanding of Armament Haki is limited to simply 'hardening' the body or weapons."

"Or, one could 'wrap' their attacks with domineering aura to increase power and defense."

"But that's just the most basic application."

Sabo extends his right hand, his five fingers slightly bent:

"The truly advanced level of Armament Haki is called 'Ryuo' in Wano Country."

"As the name suggests, it requires you to no longer suppress your domineering aura on your body."

"Instead, you should let your domineering aura flow freely within and outside your body, like water!"

To make it easier for Viktor to understand, Sabo's right hand instantly transformed into his signature "dragon claw" pose.

A layer of deep, dark Armament Haki, as solid as ink, swirled around his fingertips.

He did not unleash the force of a storm to strike the rocks as he usually did.

Instead, he very gently placed that domineering hand on the surface of the huge steel rock.

"Watch closely."

Accompanied by a low shout from Sabo.

"Bang!"

A muffled, explosive sound came from inside the rock.

Incredibly, the surface of that huge steel rock was completely intact, without even a tiny crack.

However, after a gentle breeze...

That seemingly indestructible giant rock instantly turned into countless tiny powders and dust!

The powder, like a sandcastle that had lost its support, collapsed into a mess and scattered in the wind.

I witnessed firsthand the terrifying destructive power of this technology, which completely disregards external defenses.

Viktor's deep black eyes narrowed suddenly, a hint of horror flashing in them.

"Do you understand now?"

Sabo withdrew his hand, turned around and looked at Viktor:

"Advanced techniques like Ryuo Sakura cannot be learned through mere verbal instruction or rote memorization."

"To master it, you can only personally experience the 'flow' of domineering power in extreme combat on the brink of life and death!"

"bring it on!"

Before he finished speaking, Sabo stomped down with the "Shave" move from the Six Styles of the Navy.

His figure instantly transformed into a blurry afterimage and vanished from the spot.

The next second, he was already above Viktor's head.

Sabo swung the high-density steel water pipe, which was also wrapped with flowing cherry blossoms, down on his head with a violent whistling sound that tore through the air!

Faced with this sudden sense of oppression.

Instead of retreating to avoid the attack, Victor used his legs to push forward and meet the enemy head-on!

"Clang!"

In the instant of his sprint, Viktor's eyes underwent a dramatic change.

His once pure black pupils turned crimson, and three jet-black tomoe spun wildly within his blood-red eyes, emanating a chilling spiritual aura.

Three-tomoe Sharingan, awakened!

The Sharingan's most renowned powerful insightful eye can easily see through an enemy's physical movements and subtle flaws.

In this imposing pirate world, Viktor's body has been given an almost abnormal new function.

See through the "flow of domineering aura"!

In Victor's vision, veiled by a scarlet filter.

Inside Sabo's body and on that water pipe.

The originally formless and intangible trajectory of the high-level Armament Haki was now like the brightest star trail in the night sky, which Viktor could see clearly.

How does that domineering aura gather from the dantian, flow along the meridians to the arm, and ultimately coil around the weapon's surface and maintain its "flowing" state...?

All of this was laid bare before him, revealed without reservation through the Sharingan's perception!

"I see..." Viktor suddenly realized.

However, although his Sharingan allowed him to clearly see the trajectory and principles of Ryuo.

However, "understanding" and "the body being able to learn to guide" are two completely different things.

"Clang! Clang! Clang!"

In the initial few hundred intense exchanges.

Viktor can still only use the most basic Armament Haki hardening for defense and attack.

This rigid hardening was completely suppressed by Sabona's agile and destructive Ryuo.

Amidst the flying sparks, Viktor's black sword, Autumn Water, was repeatedly blasted away by the internal force erupting from within, leaving his hand numb.

The powerful recoil even penetrated his body through the blade, causing a few drops of blood to trickle from the corner of Viktor's mouth.

But as the battle continued, what sent chills down Sabo's spine during his frenzied attack was...

This is the Straw Hat crew's vice-captain, who is known to the world as the "Worst Generation".

His learning ability is like a terrifying abyss that never tires!

Each time Viktor was fiercely repelled by the water pipe imbued with flowing cherry blossoms, his eyes would brighten even more.

When he swings his sword to meet the attack again, the Armament Haki attached to the black sword Shusui will undergo a slight but deadly change.

That originally lifeless domineering aura is becoming increasingly vibrant at an astonishing speed visible to the naked eye.

It's getting closer and closer to the "flowing" state that Saab demonstrated!

"This guy... could he possibly copy my Haki usage method directly during battle?!"

Sabo was terrified and his attacks became even more ferocious.

After a fierce collision, Viktor was cornered by Sabo in a desperate situation in a corner of the underground training ground.

There's no way to retreat!

As Sabo launched another deadly attack, a glint of madness flashed in Viktor's eyes.

He did not choose to use the Instantaneous Movement Technique to evade.

Instead, he took a deep breath and forcefully poured the raging Lightning Release chakra within his body, along with the Ryuo Haki he had just begun to grasp in actual combat, into the Shusui in his hand without reservation!

"Sizzle—!"

It was accompanied by a violent thunderous roar, like the cry of a thousand birds.

A shocking scene unfolded.

Black Blade Autumn Water's dark red blade was not only wrapped with eerie blue high-voltage lightning.

Furthermore, a dark red, domineering outer layer, resembling cherry blossom petals, appeared around the blade!

"ah!!!"

Viktor shouted and gripped the knife hilt tightly with both hands.

"BOOM!!!"

Two terrifying forces, both reaching the pinnacle of this ocean, erupted with a deafening roar within this enclosed underground space!

The deafening roar seemed to tear a black hole out of the earth.

The domineering black and red lightning, accompanied by eerie blue flashes, raged and slithered wildly through the spacious underground hall like countless raging venomous snakes, shattering the surrounding rock walls.

Even the underground training ground, which had been specially reinforced by the revolutionary army, began to succumb to the terrifying shockwave, with large chunks of rubble falling from its sturdy ceiling.

This powerful tremor even penetrated the thick strata of the earth, clearly reaching the barren ground of Baltigue.

After a long while, the dust and smoke that filled the sky finally dissipated slowly under the blowing of the strong wind.

In the center of the training field, Viktor and Sabo each slid back dozens of steps before barely managing to regain their balance.

Sabo's chest heaved violently.

He looked down at his right arm, which was trembling slightly and even charred from being struck by lightning.

Then, he raised his head and looked at the person opposite him with a complex expression, as if looking at a monster.

Dozens of meters away, Viktor, leaning on his black sword Autumn Water with one hand, was also panting heavily.

His black shirt was tattered and torn, and he had several bruises on his body.

But the crimson Sharingan had faded, and his pure black eyes were now filled with a triumphant and confident smile.

Looking at this man who underwent a transformation in just one battle.

An unquenchable storm raged within Sabo's heart:

"Incredibly... in just a few hours of intense combat, they actually managed to touch the threshold of internal destruction..."

Sabo swallowed hard, muttering to himself:

"That idiot Luffy... what kind of terrifying monster did you find on this high seas to be your first mate?!"