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

Barrett cracked his wrists, the joints popping.

"Perfect timing. I feel my Armament Haki and physical strength have improved recently. If I could stay here a little longer, that would be great."

Hawkeye nodded silently. Although he didn't need to undergo resistance training with Seastone, the environment of Thunder Isle was still very helpful in honing his swordsmanship.

Tesoro gazed towards the core lightning pool, his eyes gleaming with longing.

"Boss, I want to try entering the forbidden zone."

The lightning there is older and purer; perhaps it can help me reach the threshold of awakening the Rumble-Rumble Fruit.

Roy pondered for a moment, then agreed to Tesoro's request, but on certain conditions.

"You can try it, but you must proceed gradually. If any abnormalities occur, quit immediately."

"clear!"

Tezzolo nodded excitedly.

Training continues.

As the doctor encountered a bottleneck, everyone focused even more on their own cultivation.

After all, the most reliable way to improve one's strength is always through one's own efforts, not through external assistance.

Over the past few months, the violent environment of Thor's Isle has established a strange "connection" with everyone.

Tesoro, in particular, as a user of the Rumble-Rumble Fruit, has practically become an integral part of the island.

Every morning, Tesoro would appear precisely at the edge of the Thunder Pool.

Deep purple lightning cascaded down like a waterfall, the air thick with the pungent smell of ozone and raging electrical energy.

Tesoro sat cross-legged on a charred rock that had been struck by lightning for countless years, slowly closing his eyes and constantly drawing upon the lightning in the lightning pool.

"Come on..." he murmured to himself, releasing the pressure on the fruit.

In an instant, he transformed into a humanoid lightning bolt, resonating with the surrounding raging thunder.

Initially, Tesoro could only absorb free ions at the outermost edge of the Thunder Pool, carefully guiding them into his body.

But as time went on, he gradually delved deeper and began to come into contact with those ancient and violent sources of thunder.

This process is extremely dangerous.

Those deep purple lightning bolts contained energy far beyond the ordinary; each absorption felt like countless sharp knives cutting through the body.

But Tesoro gritted his teeth and persevered, because he could clearly feel that with each instance of such pain, his control over the Rumble-Rumble Fruit deepened.

"Not enough...not enough..."

By the second month, Tesoro was able to stay in the middle of the lightning pool for half an hour. The lightning here was purer, even carrying a faint "will".

"will?"

This discovery excited him.

If that's the case, then he's not only absorbing energy, but also "inheriting" the insights of his predecessors!

With this in mind, Tesoro's training entered a new phase.

He began to actively "listen" to the "voice" within the thunder, trying to understand the rules and will behind that violent energy.

This process is more difficult and more dangerous than simply absorbing energy.

Several times, Tesoro was almost devoured by the remaining violent will within the lightning, only being pulled back by Roy's mental power in time.

"Boss, I feel like... I'm almost there."

One day in the middle of the third month, after finishing his training, Tesoro excitedly said to Roy,

"The awakening of the Rumble-Rumble Fruit... I can feel it right before my eyes."

Roy carefully observed Tezzolo's condition.

At this moment, he was surrounded by deep purple lightning.

A glint of silver light would occasionally flash in his eyes, and his aura was almost one with that of Thunder God Island.

"Indeed, your control over the fruit has reached a critical point."

Roy nodded, equally pleased with Tezzolo's progress, but still remembered to offer some words of advice.

"Tesoro, the awakening of a Devil Fruit is not a simple accumulation of power. Don't be impatient, let it happen naturally."

Roy knew that Devil Fruit awakening came with risks, although he didn't know what would happen if a Logia-type Devil Fruit awakened.

However, considering that awakening a Zoan-type Devil Fruit can lead to its being corrupted by the will within the fruit, and failure results in turning into mindless Jailer Beasts within Impel Down, this is a valid observation.

Failure to awaken a Nature-type Awakening could be even more dangerous.

Roy looked at the Thunder Pool in the distance, wondering if it might have been formed after a previous user of the Rumble-Rumble Fruit failed.

"I see."

Tezzolo took a deep breath, suppressing his anxiety.

Meanwhile, others also made significant progress in their cultivation.

Savi, Enel, and Pea's adaptability under the suppression of Seastone has greatly improved.

Now, even when wearing 70% pure seastone bracelets, they can maintain basic mobility and about 30% of their combat strength.

More importantly, under Roy's guidance, the three of them have mastered "internal forging" to a high degree.

The density and intensity of Armament Haki increased by at least 50%, and his physical strength also increased accordingly.

"Boss, I think I can now try making an 80% pure seastone bracelet!"

Savi patted his chest, full of confidence.

Roy didn't agree immediately, but instead made him undergo a series of tests first.

Only after confirming that Savi's body could indeed withstand greater pressure did he nod in agreement.

"You can try, but you must proceed gradually and within your capabilities."

"yes!"

Barrett and Hawkeye's progress is even more astonishing.

He already possessed a very large reserve of Armament Haki, and after being honed through "internal forging," the intensity of his Haki increased rapidly.

In battle, he can perfectly fuse Armament Haki with his Devil Fruit abilities.

This forms an integrated offensive and defensive mode that combines the power of wind and the properties of metal.

Even if Roy wanted to break through his "Wind Armor" in a short time, it would take him a lot of effort.

This does not include Roy's use of rule-altering attacks.

Hawkeye honed his swordsmanship in the thunderous environment, adding to his swordsmanship insights gained during his exchanges with Wano Country.

Now, with a casual wave of his hand, his strikes seem capable of tearing through space itself.

To split lightning in two without causing an explosion—this is the ultimate and precise control of power.

Although both are great swordsmen, Hawkeye's swordsmanship is now far superior to Roy's.

"Mihawk, your swordsmanship is becoming increasingly 'sharp'."

Roy commented after a practice session.

"Not bad," Hawkeye said, sheathing his sword.

"If you had focused all your energy on swordsmanship, your achievements would be no less than mine."

Roy remained noncommittal in response to Hawkeye's answer; he wouldn't place all his hopes on swordsmanship.

Roy's goal is to achieve comprehensive strength.

While Stella, Moria, Vera, and others did not make as dazzling progress as the previous ones, they still improved steadily.

Vera, in particular, has finally mastered the Life Return technique after special training and is now also trying "internal forging".

"Boss, I did it!"

On the day she completed her first cycle, Vera was so excited that she burst into tears.

As the weakest member of the team, she finally caught up with everyone else.

Of course, Jack and his crew of the Beasts Pirates were not letting their guard down either.

Their strength has improved considerably compared to a year and a half ago.