One Piece: SSS-Rank Haki at Age Seventeen

BOOM—CRACK!!!

A gigantic lightning storm connecting the raging thunderclouds and the shattered earth tore violently through the center of the battlefield—like a spear of judgment hurled by the gods.

Violent ionized lightning and hurricane winds formed a temporary, impassable barrier.

For the first time since the battle began, the two fighters were forcibly separated.

On one side of the storm—

Silvers Rayleigh stood with his sword stabbed deep into the scorched ground, barely holding himself upright.

His body was drenched in blood.

His once-neat clothes had been shredded into ragged strips, clinging to countless shallow and deep wounds.

Every heavy breath brought burning pain and the metallic taste of blood.

His chest rose and fell violently.

Rayleigh raised his head, his gaze piercing through the chaotic lightning and dust toward the other side of the storm.

There—

Luffy stood calmly in the sky.

Aside from torn clothes, dust, and dried blood stains—

He was almost completely unharmed.

The vitality radiating from him was so overwhelming it felt hopeless.

As if the half-day battle that could erase a nation from the map had merely been a warm-up exercise.

"—Haaa…"

Rayleigh exhaled a breath mixed with blood foam.

A tired yet appreciative smile appeared on his face.

His voice was hoarse from exhaustion, but still clear.

"Fighting a monster like you… whose vitality is even more unreasonable than a Mythical Zoan…"

"I finally understand what it means to punch cotton."

He paused.

"No… more like punching a Seastone spring that never wears out."

It was infuriating.

Even with his calm mindset, Rayleigh couldn't help feeling helpless.

Every slash he poured his strength into landed solidly.

He could feel the damage.

Yet moments later—

The wounds healed before his eyes under Luffy's boiling vitality and absurd recovery speed.

This wasn't battle.

It was like throwing fuel into a bottomless furnace.

"Shishishi!!"

Luffy's signature laughter echoed across the storm.

Bright.

Energetic.

Even more cheerful after the exhilarating battle.

For him, the entire half-day clash was priceless.

He could clearly hear it—

Every cell in his body rejoicing under extreme pressure.

Especially his Conqueror's Haki.

Through constant clashes with Rayleigh's refined kingly will, it had grown denser and more aggressive.

His body had also been tempered further by such overwhelming combat pressure.

Inside, he roughly evaluated his growth:

Fighting "Teacher Kaido"—the kind of training where you get beaten half to death and evolve afterward—brought faster improvement.

But Rayleigh's teaching was different.

More balanced.

More focused on the quality of Haki and combat technique.

The experience was immensely valuable.

Stats Evaluation:

Physical Body: 92.94 → 93.36Conqueror's Haki: 91.36 → 92.08

Numbers were just abstractions.

What mattered was the real feeling of becoming stronger.

Luffy grinned at Rayleigh, his eyes filled with gratitude and blazing fighting spirit.

If anyone dares say Rayleigh is just some basic instructor again…

Luffy clenched his still-burning fist.

I, Monkey D. Luffy, will personally argue with them—with my fists.

This was a top-tier sparring partner capable of perfectly merging Haki and real combat.

And the fight—

Was far from over.

Rayleigh's Reaction

"…Huh?"

Seeing the fire in Luffy's eyes burning even stronger, Rayleigh's mouth twitched uncontrollably.

Where was this kid manufactured?

A perpetual motion machine factory?

The remaining strength in his old bones had nearly been squeezed dry during the last exchange.

Yet Luffy looked like he was just getting started.

For the first time in years, Rayleigh felt the familiar sensation of age catching up to him.

He tapped the ground lightly with his sword sheath and sighed.

Half joking.

Half serious.

"Hey, Luffy…"

"You're not planning to keep going until these old bones of mine completely fall apart, are you?"

"Eh?!"

Luffy froze.

His excited expression stopped like a train suddenly slamming on the brakes.

He scratched his messy hair.

"W-we're… not fighting anymore?"

His voice carried pure disappointment.

Like a child who just had candy taken away.

Seeing that expression, Rayleigh paused.

Then something stirred in his chest.

Nostalgia.

Satisfaction.

And perhaps a stubborn refusal to accept aging.

His gaze swept across the devastated battlefield they had created together.

Then returned to Luffy.

The boy's stamina was endless.

His own was nearing its limit.

Continuing the drawn-out battle would serve no purpose.

Fine then.

Rayleigh inhaled deeply.

Then fully sheathed his sword.

But it wasn't surrender.

It felt more like a ritual.

All his aura, his battle intent, his lifelong experience compressed inward.

He straightened his bloodstained back.

Despite exhaustion, the aura of the Dark King rose again.

His eyes flashed like lightning.

"Come, Luffy!"

His voice wasn't loud.

But it carried absolute decisiveness.

"Forget defense. Clear your mind."

"Use your full power."

He slightly spread his stance.

His right hand rested on the sword hilt.

His entire body entered a state of absolute stillness.

The calm at the center of a storm.

"Let's settle this…"

"…with one final move."

Rayleigh's Final Sword

CRACK—CRACK—!!

Decades of refined Conqueror's Haki surged into Rayleigh's silver sword like a flooding underworld river.

The blade did not shine brighter.

Instead—

It became darker.

Deeper.

As if devouring all light.

A quiet aura of absolute extinction spread from the sword.

Not cold death.

But the silent stillness after everything ends.

The moment when even time stops.

This was Rayleigh's ultimate sword path—

Forged from a lifetime of experience.

The True Meaning of the Underworld.

Where the sword pointed—

Space itself cracked and collapsed.

Behind it, pure void appeared.

Luffy's Final Power

High in the sky—

Luffy burst into laughter.

The final restraints seemed to shatter.

Black lightning filled with destructive will—

And golden flames burning with unyielding fighting spirit—

Exploded from his body like two raging dragons.

The phenomena in the sky were completely devoured.

The dark heavens turned into a blazing inferno of lightning and fire.

Night became brighter than day.

Dark red Conqueror's Haki erupted like a volcanic eruption.

It spiraled together with Luffy's pitch-black Armament Haki, fusing and evolving.

Lightning.

Fire.

Conqueror's dominance.

All distinctions vanished.

Everything was compressed violently into his iron fist.

A chaotic force beyond any single attribute was born.

A tyrannical power of annihilation.

Across the shattered void—

Their eyes met.

No hesitation.

No fear.

Both of them grinned wildly.

It was the highest respect between warriors.

The silent acknowledgment of an era being passed on.

"Final—!!"

Their battle cries merged into one.

The next moment—

Both figures vanished.

Two catastrophic comets shot toward each other.

One dragged a trail like a devouring river of the underworld.

The other burned with glorious lightning and fire.

Enough power to erase the island beneath them from the map forever.

Final TechniquesRayleigh

"Underworld Severance — Yomi Hirasaka!!!"

Rayleigh swung his sword.

The motion was ancient and simple.

Not merely a slash—

But a line dividing life and death.

A pitch-black passage appeared, connecting the world of the living with the underworld.

Space cracks spread along its edges like spiderwebs.

Everything was devoured.

Matter.

Energy.

Even light.

Luffy

"Conqueror's Thunderfire Requiem!!!"

Luffy threw his punch.

The chaotic energy in his fist revealed its true form.

Not simply lightning and fire.

But a violent existence constantly oscillating between destruction and rebirth.

Absolute tyranny.

Absolute suppression.

Space itself was crushed into particles beneath its pressure.

The Collision

One strike erased everything into nothingness.

One strike crushed everything through dominance.

When the two ultimate powers met—

The end arrived.

BOOM!!!

For an instant—

Time lost meaning.

Space lost shape.

At the singular point where their attacks touched—

The first thing that appeared was not an explosion.

But absolute nothingness.

Light.

Sound.

Matter.

All annihilated instantly.

A miniature black hole formed.

Then—

HUMMMMMM—!!!

A primordial roar erupted.

Not sound—

But the scream of space itself tearing apart.

A spherical wave of destruction expanded infinitely.

Luffy's fist and Rayleigh's sword tip pressed against each other.

Their powers still collided violently.

Trying to overwhelm the other.

Then—

RRRRRRRRRRUMBLE—!!!

The world itself seemed to roar in rage.

The unstable black-red sphere between them finally surpassed its limit.

The first victims—

Were the creators of that destruction.

Two figures were blasted away from the white core of annihilation.

Their bodies streaked across the sky like reverse-flying meteors.

Trailing fiery paths kilometers long.

Rayleigh

SPLASH—!!!

One figure crashed heavily into the raging sea.

A massive water pillar shot skyward.

It was Rayleigh.

Under the water, the former Dark King felt every bone in his body nearly shattered.

The freezing seawater surrounded him.

His ears rang with the roar of blood and trembling organs.

His mind drifted in temporary blankness.

Only the hand gripping his sword remained instinctively tight.

Luffy

SHHHHH—!!!

The air screamed.

Luffy stomped violently in midair.

Shockwaves exploded beneath his feet as he forcibly stopped his backward flight.

He hovered in the air.

One knee bent.

Breathing heavily.

Each breath releasing scorching white steam.

A terrifying sword wound stretched from his left shoulder to his right abdomen.

Rayleigh's sword intent still lingered in the wound.

A pure extinction will that resisted healing.

Blood flowed uncontrollably.

Droplets fell into the boiling sea below.

Hissing as they vanished.

And the battlefield they fought on—

The once sizable deserted island—

Had completely disappeared.

In its place remained only a vast ocean crater.

Seawater rushed inward violently.

A gigantic whirlpool formed.

Like a scar the sea could not heal.

Between sky and ocean—

Only the roaring vortex remained.

Lingering energy waves.

Falling blood.

And two exhausted warriors.

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