One Piece: Lightning's Heir

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Arthur held the Devil Fruit Encyclopedia, nodding to Aurora. "I'll take this book. As for killing Capone Bege, I won't go back on my word."

His solemn tone finally eased Aurora's anxiety. Her cold, tense expression relaxed, and a faint, forced smile appeared on her face.

The two boarded a large ship, with Aurora's trusted confidant acting as helmsman, setting course for the island that served as Capone Bege's headquarters.

The ship cut through the waves, sailing swiftly across the vast, boundless sea.

In his cabin, Arthur toyed with the Castle-Castle Fruit, his eyes glued to the Devil Fruit Encyclopedia.

The book contained detailed information on thousands upon thousands of fruits with confirmed records.

Fruits like the Logia-type Dark-Dark Fruit, Magma-Magma Fruit, and so on were described in great detail, with clear directions for development. Following these instructions would lead to great power.

However, for some reason, the entry for the Rumble-Rumble Fruit was sparse, with only a few lines and a picture.

Perhaps the fruit had been lost in Sky Island for so long that information about it had become scarce.

The entry for the Paramecia-type Op-Op Fruit was even more bare-bones, with only a picture and a single sentence, possibly due to intentional concealment by the World Government.

They were likely afraid that knowledge of its effects would incite worldwide chaos.

Eternal youth, after all, was the ultimate dream of countless people.

And it wasn't just the immortality surgery. The ability to switch minds was enough to drive anyone with ambition wild with desire.

For example, the World Government could capture a powerful pirate, switch their mind with someone loyal to the World Government, and instantly create a top-tier fighter.

It was a truly terrifying ability.

"I remember the Op-Op Fruit won't appear for at least another ten years, on Minion Island in the North Blue, in the year 1509! If things haven't changed by then... I'll be sure to claim it!" Arthur's eyes flashed as he made his decision.

He would never allow such a dangerous fruit to fall into another's hands. Only in his possession would it be truly safe.

Who knew if the person beside you had their mind swapped, becoming someone else's pawn, ready to stab you in the back at any moment?

Arthur even decided to find a Devil Fruit that could see through minds in the future...

....

"Boom!!"

The weather at sea was unpredictable. One moment it was clear skies, the next, dark clouds gathered, and thunder rumbled.

Torrential rain poured down, and waves crashed against the ship, making it rock violently, as if it would be swallowed by the sea at any moment.

"Arthur!" Aurora pushed open the door, her face urgent. "The weather has changed. We should turn back. The return journey is shorter than the trip to Capone Bege's headquarters..."

"No need. Keep going!" Arthur's expression was calm. He wasn't afraid of the storm. He continued to peruse the Devil Fruit Encyclopedia.

With his inhuman Observation Haki, how could he not sense something as simple as the movement of the wind and the shifting of clouds?

He had already scanned the surrounding dozens of miles.

Besides, even if the ship capsized, he could transform into Lightning and fly.

"Fine!" Aurora could only trust Arthur. She gritted her teeth and gave the order to her confidant.

Seeing her rush out, Arthur waved his hand, closing the door. He closed his eyes, carefully sensing the changes in the surging Lightning within the clouds.

Why was a natural Logia called a natural Logia? Because it was attuned to a particular natural phenomenon.

Therefore, in Arthur's view, the person who could teach you how to perfectly develop a Logia fruit was nature itself.

Arthur's Observation Haki "watched" the Lightning in the clouds, comparing it to his own, searching for differences or different paths of development, to chart his future course.

"Zzzzzzt!"

Lightning surged wildly within his body. Every inch of his skin, his muscles, even his hair, was charged with electricity, making the room glow blue.

Under Electromagnetic induction, all metal objects began to float.

"How can I overcome the two hundred million Volt limit?" Arthur sensed the Lightning in the sky, constantly comparing it to his own.

He had been stuck at two hundred million Volts for quite some time, unable to surpass this limit no matter what.

"In nature, Lightning can reach over one billion Volts. That means my Rumble-Rumble Fruit is only a fifth as powerful as natural Lightning. There's still a vast potential for improvement!"

Arthur frowned, pondering how to catch up to the power of nature.

"Could it be a limitation of the human body? The human body can't compare to nature?" He considered this possibility.

Humans were born from nature. To surpass nature was easier said than done, but not impossible.

Because, his current body could transform into Lightning at any time, the same as the Lightning in nature!

Right now, Arthur's Rumble-Rumble Fruit had passed its period of rapid development. To develop it further, vertically, to increase the Voltage, would require time. He could only develop it horizontally, exploring Electromagnetism, heat generation, electric light movement, electric waves, and other abilities.

His power was far beyond Enel's two hundred million Volts. His maximum destructive force should be comparable to, or even surpass, the strongest fighters in the Marines.

A single Raigo could easily destroy an island and wipe out a country.

Of course, destructive power didn't equate to strength. Enel could do the same. But Arthur's Lightning was far more powerful than Enel's, and his physique had reached the peak of the Grand Line, not far from those legendary figures.

"It's alright. Laying a solid basis is essential for further progress," Arthur consoled himself, his mood improving.

....

The wind stopped, the rain ceased, and the sky was clear, a brilliant blue, almost indistinguishable from the sea.

Arthur and Aurora stood side-by-side on the deck, enjoying the sea breeze and admiring the scenery. She kept chattering endlessly about the affairs of Capone Bege's Mafia.

Arthur, naturally, couldn't be bothered to listen. Right now, he was daydreaming, thinking about how to develop the Rumble-Rumble Fruit's abilities horizontally.

He considered his electric light movement to be no worse than Kizaru's, perhaps even stronger. After all, he could change direction, while Kizaru couldn't.

So he didn't need to develop that further, because there was no need. In terms of movement ability, he was second to none on the Grand Line, unless a legendary space-type fruit appeared.

As for heat generation, Arthur's Voltage could instantly melt dozens of tons of gold into liquid, several times hotter than ordinary magma. He wouldn't be afraid to go head-to-head with Akainu's magma, and might even vaporize it.

He had reached a limit of two hundred million Volts with his Lightning. He couldn't surpass it for now. Although his attack power was strong, it was far inferior to a monster like Whitebeard.

Only the electric field enhancement of his physique was ongoing, ceaseless.

So, after thinking it over, it seemed that only Electromagnetism had room for further development.

Moreover, Electromagnetism could almost be considered a cheat, an all-purpose ability, an abnormal level. If he could truly develop it, he might even be able to call himself invincible.

Arthur had already tried using Electromagnetism to control metal on Sky Island, with remarkable results. But his understanding of how to use Electromagnetism for attacks was still rudimentary.

He had only developed the ability to use magnetic force to propel metal to kill enemies, or to control metal. And there was the Electromagnetism - Iron Sand Sword, and using Electromagnetism to create a full-body defense. These were all the most basic understandings and applications.

Thinking of this, Arthur couldn't help but feel a headache. "Developing a fruit really requires imagination or knowledge, doesn't it? Damn it, it's so annoying!"

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