One Piece: The user of the Nen-Nen Fruit, who overturned the sea.

While everyone else was busy cultivating.

Tesoro, who disappeared earlier, is now deeper inside the island.

Unlike Roy and others who had to fight the Thunder, Tesoro felt like he was back home.

Using his Rumble-Rumble Fruit ability, he moved freely through dense thunderstorms, navigating those purple lightning bolts powerful enough to instantly vaporize an ordinary person.

When she gets close to him, she becomes docile, like a stream flowing into the sea, and is greedily absorbed into his body.

The deeper one goes, the purer and more ancient the power of thunder becomes.

Tesoro could feel the power of the Rumble-Rumble Fruit within him rejoicing and resonating strongly with the world around him.

However, even with his ability to control lightning, he dared not venture any deeper as he approached the core area.

The core of the Thunder Pool seemed to possess its own will; it wasn't simply violent. Just getting close made his soul tremble, and his Rumble-Rumble Fruit ability seemed to be suppressed, causing him to instinctively feel fear.

"What is this...?"

Tesoro hovered not far from the Thunder Pool, his heart filled with shock and bewilderment.

He could sense that the power here was of the same origin as his, but the power at the core of the Thunder Pool was beyond his control.

"If I can absorb the power there, my own power will definitely undergo a tremendous change."

After observing for a moment, Tesoro abandoned his thoughts and sat cross-legged in the air, absorbing the falling lightning into his body and carefully sensing the power of the thunder.

His understanding of the fruit's power was rapidly improving, and his physique was also constantly strengthening.

Just as Roy and the others were immersed in their cultivation, three days passed quietly.

During this time, Roy, Barrett, and Hawkeye returned to the outer perimeter. After inquiring about everyone's training progress, they had Pea prepare a lot of food, and the three of them returned to their original positions to continue training.

The gains over these three days have been enormous.

Roy's Armament Haki, continuously "forged" by lightning, deepened in color and improved in quality by at least half a percent.

Just as Roy was about to sit cross-legged and enter a meditative state again, a familiar aura appeared in his senses.

"not good!"

Roy's expression changed. After a brief encounter four years ago, Roy could certainly recognize the owner of this aura—Golden Lion Shiki.

Immediately use your mental energy to connect with your partners.

"Gentlemen, enemies have appeared."

"Stella, immediately take your outer comrades to Ark Maxim and get away from Thunder Isle."

Savi, Charon, Enel, and Pea: "We will fight too!"

Stella: "What's wrong, Roy!"

Barrett: "Who's here!"

"No time to explain, execute the command!"

"yes!"

Sensing Roy's seriousness, Stella immediately gathered the others and boarded the Ark of Truth, following Roy's guidance to leave the area far away.

Barrett and Hawkeye stopped what they were doing and headed towards Roy when he gave the order.

As the three gathered, Roy tried to pinpoint Tesoro's location, but to no avail.

"Damn it, where has he gone now?"

Roy cursed inwardly. He hadn't expected that his Observation Haki wouldn't be able to sense Tesoro's presence. "This is unbelievable!"

What Roy didn't know was that Tesoro was no longer satisfied with simply absorbing and comprehending the surrounding lightning power.

As he transformed his entire body into lightning and merged into the surrounding environment, he continuously extended the tentacles of lightning into the core lightning pool, carefully drawing out strands of lightning.

Continue to enhance the development of the fruit's abilities.

"Never mind him!"

Roy withdrew his Observation Haki, and the three of them headed directly to the outer perimeter of the island.

"Buzz!!!!"

The three of them had just stood at the edge of the island when a violent, furious Conqueror's Haki swept over from afar!

The sheer power of this Conqueror's Haki instantly dispersed part of the thunderclouds above Thundergod Island, causing the lightning along the island's edge to disappear.

"It's him!" Barrett recognized the figure in mid-air instantly.

Shiki the Golden Lion hovered in mid-air, like a demon god descending to earth. His raging Conqueror's Haki was almost tangible, standing shoulder to shoulder with the remaining lightning in the sky.

Looking down at the three men who were waiting in ambush, he first glared fiercely at Barrett, then his gaze finally locked onto Roy, a murderous smile spreading across his face.

"Hehehehe!! Roy! Barrett! Four years have passed, and I've missed you terribly!"

"Hahaha! Well then, thank you for your concern, Golden Lion. After all, the White Tiger Fruit has greatly increased Barrett's strength!"

"What did you say?!"

As Roy finished speaking, Barrett beside him immediately entered his beast form.

This scene made Shiki, who was in mid-air, so angry that the veins on his forehead bulged.

"Damn brat!"

Shiki gritted his teeth, his Conqueror's Haki seeming even more ferocious as he pressed down on Roy and the other two.

"snort!"

Roy and his two companions were equally determined, unleashing their Conqueror's Haki to counter their attack.

In an instant, Roy's Conqueror's Haki, a powerful blend of spiritual energy and destructive force,

Barrett's Conqueror's Haki, radiating an aura of destruction like that of a demon, was incredibly powerful.

And Hawkeye Mihawk's incredibly sharp Conqueror's Haki,

Three powerful auras surged into the sky. Although each individual's Conqueror's Haki was inferior to that of Shiki, the combined strength of the three of them managed to withstand Shiki's Conqueror's Haki and even subtly gained the upper hand.

Above the sky, several domineering auras intertwined, collided, and annihilated each other, causing the world to lose its color and sweeping away the thunderclouds above!

The sea below was forced into a huge depression by invisible pressure, with surging waves!

"Hahaha! Interesting! Very interesting!"

The golden lion, instead of being angry, laughed, but its eyes flashed with a cold light.

"Do all three of you possess the qualities of a king? But one king is enough! Today, I'll personally annihilate you all!"

"We're the ones who should defeat you here!"

Roy drew his long sword from his waist, his left hand outstretched towards the golden lion.

"Universal Guidance!"

With immense mental power, he was about to pull the golden lion down from the sky.

"What?!"

The floating golden lion felt a force suddenly arise from nowhere, acting on his entire body, about to pull him off.

"Hmph! A mere trick!"

Golden Lion drew his twin swords from his waist, channeling Armament Haki throughout his body. With a slight tremor, he shattered Roy's mental energy.

He steadied himself and brandished his twin swords.

"Lion Valley!"

Countless massive slashes belonging to the great swordsman flew towards Roy and his two companions below!

"That's an exaggeration!"

Roy watched with envy as the Golden Lion unleashed a massive slash with a casual flick of his wrist. Although he had reached the pinnacle of swordsmanship, he still had a long way to go before becoming a true master swordsman.

Facing the oncoming torrent of sword energy, Hawkeye on Roy's right was the first to move.

Hawkeye stepped forward and stood in front of Roy and Barrett.