After John and Vegapunk succeeded in creating the island-wide heater, John began focusing on his own personal interests and development.
The moment the heater project was completed, he immediately shifted his attention toward something he had been wanting to practice for a long time.
This started with him wearing a blindfold almost every hour of the day. When Vegapunk asked him about it, all John said was that he wanted to train something. He did not explain any further.
Vegapunk simply accepted this answer because he already understood how intense John could be about training.
Over the year they spent working together, Vegapunk often felt it was a little unfortunate that John dedicated so much time to training instead of fully exploring other fields of knowledge.
He even believed that their heater project took an entire year mainly because John spent a large portion of his time on physical training instead of focusing purely on engineering.
Once John committed to this new training method, he fully incorporated the blindfold into his everyday routine. He acted as if he were genuinely blind, refusing to remove the cloth while moving around the house, working on his tasks, or even helping Vegapunk carry items.
His goal was clear in his mind. He wanted to reach the level of sensory perception that figures like Redfield, Issho, and Enel possessed. Their Observation Haki served as a model for what he wanted to develop.
Redfield could read minds through his Observation Haki alone. Issho could sense the true intentions of people without needing visual cues. Enel had such overwhelming range that he could cover the entirety of Skypiea with his awareness.
John understood these abilities were rare, but he wanted to approach them through consistent training.
On the first day, just walking around the house became a challenge. The blindfold blocked everything, and his steps were uncertain. Simple tasks took much longer, and he had to adjust to the sudden loss of vision.
Still, by the end of that same day, he began noticing faint signals around him. It started with the sensation of movement or the presence of objects nearby.
Every day that followed, these sensations became slightly clearer, and the radius of what he could sense gradually expanded. After a month of living under the blindfold, he fully awakened his Observation Haki.
Even after this, he chose to continue wearing the blindfold because he felt there was still much more he could develop by limiting his sight and pushing his awareness further.
While his Observation Haki progressed, John also continued training his Armament Haki. He had already awakened it earlier due to his year of following the Garp training routine.
Because of this, he moved toward the advanced applications of Armament. He repeatedly reviewed the scenes of Hyogoro teaching Luffy the Ryuo method, especially the idea of projecting Haki outward and focusing it internally to damage from within.
John tried to understand the feeling behind it, and he began shaping his training to move toward that kind of internal destruction technique.
Of course, he did not abandon his Devil Fruit. He integrated the Jiki Jiki no Mi into nearly everything he did.
He practiced manipulating heavy metals for hours at a time, leaving them floating in the air, rotating them, shaping them, and breaking them down only to rebuild new structures immediately afterward.
This constant repetition helped his control improve steadily without slowing down other parts of his routine.
At the same time, he started exploring the use of actual weapons. John knew that in the world of One Piece, the most common weapons were guns, swords, and fists.
Since he had already devoted much energy to strengthening his fists, he decided it was time to learn about rifles, pistols, and basic swordsmanship.
He did not plan to specialize heavily in sword combat, but he wanted functional familiarity so he would not be at a disadvantage if the situation required a blade.
He believed that being knowledgeable in all three weapon types would make him more versatile in the long run.
Through all of these efforts, John created a balanced routine that allowed him to improve his haki, physical strength, Devil Fruit mastery, and combat awareness.
Even though he trained quietly and without dramatic displays, every part of his routine steadily pushed him forward in a consistent and meaningful way.
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Six full years had passed since John began training like a maniac, and the improvement he achieved during that period could only be described as unbelievable.
His Observation Haki had reached a point that genuinely surprised even him. Without relying on any assistance from his Devil Fruit, he could observe and sense the entirety of Karakuri Island.
For him, this was the result of constant practice, but for anyone else, it would be something close to impossible, given how large and mechanically complicated the island was.
As the years went by, John encountered more and more World Government agents who tried to infiltrate the island.
These agents attempted to disguise themselves as civilians or workers, each with the goal of kidnapping either Vegapunk or John.
The Government had already learned about the contributions both of them had made to Karakuri, and they wanted to claim those benefits for themselves.
However, every single attempt ended in failure. The moment any agent reached the island in secret, John detected their presence through his Observation Haki.
Before the agents even realized they had been exposed, they were struck by a large mass of falling metal that crushed them instantly. This method became something of a natural trap for anyone who tried to sneak onto the island.
John was able to do this because he had successfully awakened his Devil Fruit. His awakening allowed him to assign magnetic properties to objects that were not normally magnetic.
He used this ability to mark the Cipher Pol agents with specific magnetic poles, turning them into targets.
The large metal masses that fell from the sky were actually pieces of metal that John kept hovering above the island at all times.
When he sensed intruders, he simply removed his magnetic control over the metals and assigned them new poles that caused them to be attracted directly toward the agents.
The collision force alone was enough to eliminate them before they could take another step.
At first, maintaining this constant level of magnetic manipulation was exhausting. The awakened state of his fruit demanded more physical and mental energy than basic usage.
Yet the more he used it, the more his body adapted, until it started becoming second nature.
Because of this gradual adaptation, John eventually learned how to mimic the effects of the Float-Float Fruit.
He found that by creating a stable magnetic field around himself, he could lift his own body into the air even when there were no metals nearby.
This allowed him to levitate freely, adjusting his height and movement with precision that improved as he continued practicing.
John also saw steady improvement in his physical strength. His body entered a period of rapid growth and development, and his muscles became stronger and more defined.
His punching power continued to improve, mainly because he never stopped following the same training routine he had begun when he was seven years old.
Now that he was fifteen, he had no intention of stopping, and the consistency rewarded him with a physique that had surpassed the average human by a wide margin.
His swordsmanship training also progressed. He shaped his practice after the training methods Zoro used in the original series.
Through repeated attempts and careful attention to sensation, he eventually unlocked the ability known as the Breath of All Things. This allowed him to cut through nearly any material he wanted, even with a dull weapon.
At the same time, he could choose not to cut certain objects even with the sharpest blade in his hand.
The technique required focus and calmness, but he managed to grasp it and integrate it into his overall combat skills.
He also began studying gun techniques. Using the movements and sequences he remembered from the John Wick films, he practiced controlling firearms in fluid and efficient ways.
He eventually learned to apply these movements instinctively. On top of that, he created a rifle based on electromagnetic principles.
The weapon released concentrated beams of magnetic energy, and the resulting power exceeded the beams that Eustass Kidd used in the original series. John considered this rifle a useful addition to his arsenal, especially in long-range situations.
Both his Observation and Armament Haki reached the advanced level after years of steady training. His haki reserves grew considerably, even though he was not fighting real opponents.
Thanks to the Essence abilities and perks he had, his growth rate stayed consistent. At this point, he was confident that he could maintain an external release of Armament Haki for more than a week without stopping.
The only thing he lacked was Conqueror's Haki. He believed it would eventually awaken once he witnessed someone use it in front of him. He felt he was close but not quite ready.
His laboratory also expanded significantly during these six years. The room was filled with blueprints, prototypes, and completed inventions stacked neatly in the corners.
He had developed a unique ability that reduced his need for sleep. Even after staying awake for an entire month, he only needed a single full day of rest to recover completely.
This ability became one of the most useful things he had for his lifestyle, as it gave him many extra hours to train, invent, and improve without suffering from constant exhaustion.
Through all of these improvements, John continued pushing himself forward, not through dramatic events but through steady effort, repetition, and a willingness to work on every part of himself.