Yasa held the Devil Fruit Compendium and nodded at Aurora. "I'll keep this compendium. As for killing Capone Bege for you, I'll definitely keep my word."
His solemn tone finally made Aurora feel better. Her cold, tense face relaxed, revealing a forced smile.
The two boarded a large ship, with one of Aurora's trusted subordinates steering as they headed toward the island where Capone Bege's headquarters was located.
On the vast, boundless sea, the ship sailed swiftly, cutting through the waves!
Inside the cabin, Yasa played with the Fortress Fruit in his hand while his eyes remained fixed on the Devil Fruit Compendium.
The book contained clear records of several thousand fruits.
Like the Logia-type Dark-Dark Fruit and Magu-Magu Fruit, which were described in great detail, their development directions were very clear, allowing one to reach extremely high levels by following the steps.
In contrast, the Rumble-Rumble Fruit had very little record for some unknown reason, with only a few brief descriptions and a single illustration.
Perhaps this fruit had been washed up on Sky Island too long ago, making it impossible for them to access.
As for the Paramecia-type Ultimate Surgical Fruit, it was unclear whether the World Government was deliberately concealing information. There was no detailed record at all, only a single illustration and a brief description.
Perhaps they feared if Pirates discovered its effects, it would trigger global madness, so they didn't write it down.
Immortality - the ultimate dream of so many?
Not just the Ageless Surgery, but even its ability to transfer minds alone would be enough to make any ambitious person covet it madly.
For example, if the World Government captured a powerful Pirate, they could swap in the mind of someone utterly loyal to the World Government and instantly create a top-tier expert.
It's a completely insane ability.
"I remember the Op-Op Fruit won't emerge for at least another decade. In the future, North Blue's Minion Island, Sea Circle Era 1509! By then... if nothing's changed, I'll claim it first!" Yasa's eyes flashed as he made up his mind.
He absolutely couldn't let this dangerous Fruit fall into anyone else's hands. It would only be safe in his possession.
Because you never know if the person beside you has had their mind replaced, becoming someone else's puppet, ready to stab you in the back without reason.
Yasa even decided to find a Devil Fruit that could reveal people's true minds later...
***
Boom!
The weather over the sea changed in an instant. Clear skies turned to dark clouds and thunderclaps.
A violent storm struck, waves crashing against the ship's hull as it rocked violently, seemingly on the verge of being swallowed by the sea.
"Yasa!" Aurora burst into the cabin, her face urgent. "The weather's changed! We should head back - the return route is shorter than going to Capone Bege's base..."
"No need. Keep moving forward!" Yasa's face remained calm, unfazed by the storm as he continued studying the Devil Fruit Compendium.
With his superhuman level of Observation Haki, how could he possibly fail to sense the movement of wind and clouds?
He had already thoroughly scanned the area for dozens of miles.
Besides, even if the ship capsized, he could transform into lightning and fly into the sky.
"Alright!" Aurora could only trust Yasa. Gritting her teeth, she gave orders to her trusted crew.
Watching her rush out, Yasa waved to close the door. He closed his eyes, carefully sensing the changes in the thunder within the clouds.
Why are Logia Fruits called Logia? Because they inherently align with natural phenomena.
Thus, Yasa believed that only nature itself could teach one how to fully develop a Logia Fruit.
Using his Observation Haki, Yasa "observed" the lightning within the clouds, comparing it to his own, seeking differences in development paths to find his future direction.
Zzzt! Zzzt! Zzzt!
Electricity surged wildly through his body. Every inch of his skin, muscles, even his hair carried currents, illuminating the room in blue light.
Under electromagnetic induction, all metallic objects began levitating involuntarily.
"How can I break through the 200 million volt limit?" Yasa sensed the high-altitude lightning, constantly comparing it to his own.
He had been stuck at 200 million volts for quite some time, unable to surpass this barrier.
"In nature, lightning can reach over a billion volts. This means my Rumble-Rumble Fruit is only one-fifth of nature's potential - there's still massive room for improvement!"
Yasa furrowed his brow deeply, pondering how to catch up to nature's power.
Could it be a limitation of the human body? Is it impossible to compare with nature? He considered this possibility.
Humans themselves were nurtured by nature. To catch up to nature would be like a madman's dream, but it wasn't entirely impossible.
Because his body could transform into lightning at any time, just like natural lightning!
At this point, Yasa's Rumble-Rumble Fruit had passed its rapid development phase. Vertical development to achieve higher voltages required time to refine, so he could only expand horizontally into electromagnetism, electric heat, electric light movement, and electric waves.
His strength couldn't be compared to Enel's 200 million volts. His maximum destructive power could rival or even surpass the strongest combatants in the Marines. A single Thunderclap could destroy islands and nations with ease. Garp, Sengoku, and Kong were exceptions.
Of course, great destructive power didn't necessarily mean great strength. Enel could do the same, but Yasa's lightning was far superior. Moreover, his physique had already reached the peak of the great oceans, standing not too far from those legendary figures.
"It doesn't matter. Only by laying a solid foundation can we continue to progress." Yasa comforted himself, feeling much better.
The wind had died down and the rain ceased. The sky, washed clean, stretched in a deep blue expanse that blended seamlessly with the ocean.
Yasa and Aurora stood shoulder-to-shoulder on the deck, letting the sea breeze carry them as they admired the view. The woman chattered endlessly about Capone Bege's Mafia affairs.
Yasa couldn't follow the conversation. His mind wandered as he pondered how to develop his Rumble-Rumble Fruit ability horizontally.
He believed his lightning movement skills surpassed even Kizaru's - perhaps even superior. After all, he could make sharp turns while Kizaru couldn't.
Thus, there was no need to develop this aspect further. When it came to mobility on the high seas, no one could claim to be better than him unless the legendary Space-Space Fruit appeared.
Regarding heat generation, Yasa's voltage could instantly melt dozens of tons of gold into liquid form, producing temperatures several times hotter than ordinary magma. He wouldn't hesitate to challenge Akainu's lava in a direct confrontation, even capable of evaporating it.
His lightning power was currently capped at 200 million volts, with no immediate means to break through. While formidable, it still paled in comparison to the monstrous power of Whitebeard.
Only the Electrode-Enhanced Physique continued its relentless enhancement, with no end in sight.
After much consideration, it seemed that electromagnetism offered the only path for further development.
Moreover, electromagnetism could be considered a game-breaking ability - a universal solution, bordering on the absurd. If truly mastered, it might indeed proclaim invincibility.
For reference, compare it to Railgun from Toaru Kagaku no Railgun and Magneto from the Marvel Universe!
While on Sky Island, Yasa had experimented with controlling metal through electromagnetism, achieving notable results. However, when it came to using electromagnetism for attacks, he remained woefully underdeveloped.
He had only managed to create basic applications: using magnetic force to propel metal against enemies, manipulating metal objects, an Electromagnetic Iron Sand Sword, and full-body electromagnetic shielding - all crude understandings and applications.
At this thought, Yasa couldn't help but groan, "Does the Development Fruit truly require either wild imagination or specialized knowledge? This is fucking annoying!"