One Piece: Signing In as a Pirate Begins with Roger's Execution

"What an impressive ability. No wonder Barrett's physique is so monstrous—his body density alone far exceeds that of ordinary people.

Still, I need to confirm whether it also enhances his stamina. That remains to be seen."

Hovering in midair, Karl paused to assess. He had effectively analyzed Barrett's "Body Enhancement" ability.

This ability increased body density to such an extent that it granted near-impervious defense, allowing Barrett to endure many direct attacks.

While it remained uncertain whether this defense extended to bladed weapons, his resistance to blunt force had certainly skyrocketed.

Meanwhile, Barrett realized his strongest attack had failed to faze Karl. His expression darkened.

He had never imagined that a mere Marine upstart could prove so troublesome.

"It seems I'll need to go all out to deal with you!"

Barrett murmured under his breath, pulling out a device resembling a remote control. With a press of a button, a massive pirate ship shaped like a submarine surfaced from the ocean, capsizing the surrounding Navy warships.

Karl reacted swiftly, using his ability to lift the ships into the air and relocate them to a distant patch of sea, ensuring no one would perish in the chaos.

Barrett seized the opportunity to reach the shoreline, single-handedly hauling the enormous submarine onto the water's surface. Then, he activated his Devil Fruit power.

"Bullet! Fusion!!!"

With a thunderous roar, Barrett merged with the gigantic submarine, transforming into a colossal mech resembling a Gundam.

The mech stood at least several dozen meters tall, towering over even the largest giants.

"Marine brat! Now I'll show you the meaning of despair!!!"

Barrett's Conqueror's Haki erupted, engulfing the entire island in an oppressive wave of power.

Combined with the towering mech, the pressure he exuded was overwhelming.

Facing Barrett's maniacal grin, Karl responded in kind, unleashing his own Conqueror's Haki.

In an instant, the clash of their Haki sent a violent shockwave tearing through the air, obliterating the few remaining trees on the island.

The sheer force of their confrontation left the nearby Marines trembling. Fearing for their safety, they steered their ships further from the island.

Smoker, now transformed into smoke, carried Kuro through the air toward the naval ships.

Initially, they had stayed behind to observe the battle, but the collision of Conqueror's Haki had left them disoriented and in pain.

If they didn't leave immediately, their brains might suffer permanent damage.

Clenching his teeth against the pain, Smoker dragged Kuro to safety.

"Not bad, Marine. Among the Navy, only Fleet Admiral Sengoku and you possess Conqueror's Haki.

But having Conqueror's Haki doesn't mean you're strong. Now, I'll show you true despair!"

"Feel death's embrace, Marine brat!!!"

Barrett roared, his colossal Gundam enveloped in Armament Haki, charging toward Karl like a mountain collapsing.

Karl couldn't face the massive figure head-on and retreated toward the sea, evading Barrett's relentless strikes.

Each of Barrett's attacks carried the force of a mountain, something even Karl's Sandai Kitetsu couldn't parry directly.

Currently, only Whitebeard and Garp could meet such power head-on, flattening mountains with their fists. Even Sengoku fell short.

Karl knew his limits. Instead of confronting Barrett directly, he exploited his agility and launched a barrage of water dragons at his foe.

What do Devil Fruit users fear the most?

Seawater.

Thanks to his Devil Fruit ability, enhanced by the system, Karl had eliminated all side effects.

This advantage made him nearly invincible near water. Even against Whitebeard at sea, Karl could hold his own. Against Barrett, who was only a few years older and far from his peak strength, Karl had the upper hand.

As the ocean and island trembled, water dragons and storms engulfed Barrett's massive Gundam.

Though Barrett coated his mech in Armament Haki, he couldn't risk prolonged contact with seawater.

Karl capitalized on this, drenching the Gundam with torrents of water. Despite the submarine's design, some water inevitably leaked into the mech.

"Damn you, brat!!!"

Refusing to yield, Barrett abandoned defense and charged through the storm, sustaining damage to his Gundam.

"Die!"

Barrett fired several cannon shells from the Gundam's back, targeting Karl in the sky.

With a casual swing of his blade, Karl unleashed a cutting wave, obliterating the cannon fire and continuing toward Barrett.

Barrett crushed the cutting wave with his bare hands and leaped upward, attempting to smash Karl with both fists.

Despite Barrett's overwhelming strength, the size of his mech hindered his speed, making it impossible to match Karl's agile movements.

Karl darted around like the wind, his Float-Float Fruit granting unparalleled mobility.

"Ordinary Strike!"

Karl's eyes glinted as he seized an opening, delivering a precise slash that sent Barrett's Gundam crashing into the shallow waters near the island.

Though the sea posed little threat to the massive mech, Karl observed its intricate drainage system and hatched a plan.

If he blocked the drainage ports, Barrett would be at his mercy.

"Let's see how you handle drowning with nowhere to drain the water!"

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