One Piece: Lightning's Heir

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"Run... Run!" Ola Fursten roared, quickly rushing to the helm. He slapped the helmsman aside, sending the underling flying, and took control himself.

But his voice trembled slightly, and the sound of the wind covered it, so the Pirate crew didn't understand. They thought their captain was eager to plunder.

They cheered excitedly, beating their chests. Some of the ships, eager to get ahead, even overtook the main ship, speeding towards Arthur.

"Arthur, Pirates are blocking the way!" Aurora called out, a note of urgency in her voice.

The warning snapped Arthur out of his deep thought.

Disturbed from his contemplation, his face naturally darkened.

"...." His expression was cold. The inspiration he'd just had vanished without a trace, fueling a murderous rage.

"Hahaha, there's a woman!"

"Kill them all, and offer the woman to the cap!"

"Kill! Kill! Kill!"

The two sides' ships had met. The Pirates brandished their heavy chains, flinging the iron balls at the end toward the mast of Arthur's ship.

Arthur's gaze turned icy. He reached to his waist, and with a surge of electricity, the iron chain wrapped around his waist instantly transformed into a long, shimmering whip of crackling lightning.

"Electromagnetism - Iron Sand Whip!"

The chain around his waist was originally made of iron sand. On the God-Given Island of Sunlight and Hope—Arthur had drawn iron sand from the ground, developing a move called [Electromagnetism - Iron Sand Sword].

The [Iron Sand Whip] and the [Iron Sand Sword] were similar in principle.

However, the sword was generally used for close combat, while the [Iron Sand Whip] could be extended indefinitely, used for long-range attacks!

"Whoosh!!"

Driven by electricity, the whip cracked through the air. Illuminated by the sunlight, it shone with a brilliant blue light.

It extended forward continuously.

The head of the [Iron Sand Whip] suddenly swerved, lashing out at the Pirates who were trying to board.

The Pirates at the forefront didn't even understand what had happened before their bodies were sliced in two. With a "plop," they fell into the sea, their blood instantly staining the water red.

"What's going on?"

"What happened??"

The Pirates who were preparing to board via the chains paused, staring in horror at their dead comrades.

"Where's the Captain??"

"The Captain—he ran!"

Some Pirates turned their heads, seeing that the main ship had already turned around and was fleeing at full speed, like a desperate stray dog.

Before they could react, the blue-electric-driven [Iron Sand Whip], like a slender thread, turned again and lashed towards them. The dazzling light, though it was lightning, felt as cold as ice, making the many Pirates shudder.

The iron sand, controlled by Electromagnetic force, had the potential for infinite extension. And by connecting it with Electromagnetism, it ensured its sharpness and prevented it from easily breaking. Its destructive power was astonishing. With a single lash, it could even slice a Pirate ship in two.

Its sharpness seemed comparable to the level of a swordsman who had mastered cutting steel!

Ola Fursten took the helm, fleeing swiftly. Thanks to the favorable wind and the ship's own power, it was like an arrow loosed from a bow.

He seemed to think he was safe. He took a deep breath, wiped the cold sweat from his brow, and looked back in the direction from which he had fled.

Arthur's Iron Sand Whip had thinned to the size of a hair, but its power remained undiminished. Under his Electromagnetic control, it was as nimble as his own arm, striking wherever he directed, with incredible flexibility.

Every lash claimed the lives of over a dozen men. One ship after another was split in two and sank to the bottom of the sea, causing many Pirates to wet themselves in fear.

Let's test the power of the Electromagnetic Railgun!

Arthur found killing with the Iron Sand Whip slow, far less efficient than the all-encompassing Rain of Thunder. So he stopped.

With a thought, the scythe-like iron sand immediately flew back, gathering in his palm.

He separated a coin-sized iron ball. Electromagnetic force instantly spread out, forming a magnetic field. He adjusted the launch trajectory, aiming at the Pirate ship with the most Pirates.

Electromagnetism, as the driving force, could greatly increase the speed and power of a projectile, making it a hundred times stronger than the cannons on Marine warships.

"Super Electromagnetic Railgun!!" Arthur flicked his hand.

"BOOOOOMMM!!!"

The iron ball and the air rubbed violently, producing a deafening roar. Because of the presence of the atmosphere, friction generated heat, and the iron ball quickly began to melt. The intense heat caused the iron to begin to vaporize.

"BOOOOOOOOOOOOOOOOOOMMMMMMM!!!"

Almost immediately, the Electromagnetic Railgun struck the Pirate ship, which was less than 600 feet away. The immense power shattered the ship into pieces.

Flames erupted. The entire ship of Pirates was instantly swallowed by the sea!

The Electromagnetic Railgun continued onward, striking the surface of the sea, creating a crater. Another second later, a cloud of steam rose, the heat from the friction vaporizing the seawater, which was then dispersed by the sea breeze.

"S-save... Save me!"

No one could know the feelings of these few surviving Pirates. They thought they could plunder wealth or beautiful women as usual. But instead... they encountered the grim reaper's scythe. Their captain, seeing the situation, had fled faster than a rabbit!

Some clever Pirates immediately abandoned ship, plunging into the sea with a "plop," relying on their decent swimming skills to escape.

These small fries weren't worthy of Arthur's attention. He had crushed a swarm of ants, nothing more. He didn't even change his expression. He frowned and continued to think.

"The [Iron Sand Whip] and [Iron Sand Sword] are only useful for clearing out small fry. Their efficiency is far inferior to [Divine Judgment] and [Rain of Thunder]!

So they can only be used in close combat against skilled opponents, similar to how Kizaru uses the Ama no Murakumo Sword, which he forms from light."

"The Electromagnetic Railgun's power is great, but it also has shortcomings. Because the launched iron ball can't be elementalized, it's limited by speed and air pressure. Although it's still fast, it's absolutely unusable against skilled opponents. Observation Haki can predict the point of impact! Moreover... the intense friction generates heat. If the iron ball is too small, it will vaporize before it hits. If it's too large, the effect is diminished, wasting stamina!"

"Moreover, I still can't use Electromagnetism to freely increase or decrease friction and elasticity!"

Arthur fell into deep thought, ignoring external affairs.

....

Aurora, for the first time, witnessed the true power of the Rumble-Rumble Fruit. It was far more powerful than when he had killed Gotti on Elbak Island. Her heart was filled with shock.

Her pretty face was ruffled by the wind, and her eyes darted around.

Meanwhile, the Pirate leader, Ola Fursten, who had already escaped, witnessed this shocking scene through a telescope. He wiped away his cold sweat, glad he had run fast.

"That's the legendary Logia-type Devil Fruit? How frightening... Good thing I'm quick-witted! No, the Young Miss has recruited this powerful man—she's probably coming to deal with Capone Bege. I have to report back and let the boss prepare!"

He took the helm himself, urging the sails to their fullest, heading towards the Mafia's headquarters!

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