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"ROOM!"
"ROOM, High-Frequency Surgical Knife!" Law frowned, contemplating the arc-emitting blade: "Alpha rays are related to electric and magnetic fields, and an electromagnetic field is a physical field generated by charged objects. A charged object within an electromagnetic field will experience the force of the electromagnetic field, and the nature of the electromagnetic force is in some aspects similar to universal gravitation." Fortunately, the One Piece world also had a high level of scientific development. After spending a vast amount of time in the Marine Headquarters library, Law finally confirmed the above connections.
"Metal conducts electricity, and a high-frequency surgical knife is naturally a charged object. So how can I feel the force of the electromagnetic field?" But knowing a certain principle was still a long way from developing the ability; countless difficulties had to be overcome. Especially since these abilities were derivatives of derivatives, with only a minuscule connection to the Op-Op Fruit's core ability, developing powerful abilities through these minute connections was incredibly difficult. It was hard! Very hard!
"Laser surgery is also a type of medical procedure. Developing a laser should be simpler, shouldn't it?" Law's energy was all focused on developing Devil Fruit abilities. The fatigue was even harder to bear than extreme training. Every experiment required manifesting his Devil Fruit ability. Slowly, Law's Devil Fruit abilities were gradually increasing. He became more proficient with the abilities he already possessed. Law had long stopped caring about the passage of time. After being utterly exhausted, Law didn't rest. Instead, he entered his underground laboratory. No matter how hard or busy he was, he would make time to study human anatomy, cells, and genes, as these were the Op-Op Fruit's most specialized abilities. How could he gain the ability to seize others' life force without understanding the mysteries of the human body? To better his research on the human body, Law had Corazon expend considerable effort and means to finally obtain the corpse of a pirate who had been executed. With a corpse, the exploration of various mysteries of the human body naturally accelerated. Law had almost read through all the medical texts in the vast library of Marine Headquarters.
Time thus passed swiftly. Two years later.
"ROOM."
The space manifested, not large, only a hundred meters. Although Law could manifest a ROOM space with a maximum area exceeding a thousand meters, there was no need to fully activate it during training; practicality was enough.
"High-Energy Electromagnetic Cannon." He drew the silver gun from his waist. It was a pure metal firearm, crafted from rare metals. This pistol was a top-tier firearm in the One Piece world, its range and power even surpassing industrially manufactured pistols from Earth. The most important feature of this particular gun was that it was the best conductor and charged object.
"High-Energy Electromagnetic Cannon."
The silver pistol flickered with electric arcs. When the trigger was pulled, an arc-emitting bullet instantly shot out, reaching several times the speed of sound, and continuously accelerating, increasing the bullet's accuracy and destructive power severalfold. The terrifying speed left afterimages in the air, like a silver-purple beam of light, carving a gully into the earth along its path. Trees along the way disintegrated into fragments in the tearing force of the air. The bullet finally struck a distant hill. With a massive bang, the rocky hill showed a ten-meter-wide hole. Such power was stronger than a cannon.
"Still not enough." Law frowned slightly. Over a year, almost two years of effort, to develop the High-Energy Electromagnetic Cannon. Its power was formidable, but Law was not satisfied. "To increase its power, it's not enough to simply increase output. The primary prerequisite is that the voltage must be increased. Although I've mastered the high-frequency surgical knife, it's not a core ability of the Op-Op Fruit, making it difficult to increase voltage and current."
"Laser Cannon." He still aimed the silver pistol forward. This time, no bullet shot out. Instead, dazzling golden light rapidly condensed at the muzzle, then burst forth. This was a true laser.
"Sizzle, sizzle!" Compared to the thunderous High-Energy Electromagnetic Cannon, the Laser Cannon was silent. It silently pierced the hillside, leaving only a tiny hole. Did it penetrate the hill completely? Very powerful, especially its penetrating force. "Far from enough. Laser attacks shouldn't be so simple. The attack method is too singular." Law was never satisfied. How could he be satisfied without reaching the top?
"ROOM."
Space manifested again: "Electromagnetic Field, Universal Gravitation." He drew his blade, which shimmered with electric arcs, then plunged it into the earth before him, communicating with the earth through the blade.
"Rumble!" Within the ROOM space, the earth trembled. All the grass lay flat, and pebbles slowly embedded themselves into the ground. This was gravity? More precisely, this was universal gravitation. Many properties of the electromagnetic field were identical to universal gravitation. The force of universal gravitation needed no words. Law hadn't yet been able to develop universal gravitation with himself as the source. He could only alter the degree of gravitation in a specific area, based on true universal gravitation. This meant Law couldn't directly use universal gravitation to create terrifying gravitational pull, unable to draw people or objects to him. But Law could change the strength of universal gravitation within the ROOM space, meaning he could alter gravity. Currently, Law could only double gravity, making the ROOM space exhibit twice the normal gravity.
"The manifestation of universal gravitation is equivalent to possessing gravity, which is equivalent to possessing a super powerful ability. And if I can reach the point where I manifest universal gravitation myself, it's equivalent to possessing terrifying gravitational pull. If I develop it in reverse, can I possess repulsion?" Law's eyes lit up. With this single ability, he could reach the very pinnacle. Gravitation, repulsion, gravity—any one of these abilities was a top-tier ability.
"Too difficult." Law smiled bitterly. The manifestation of universal gravitation first relied on the electromagnetic field, controlling the electromagnetic field with charged matter. The stronger the current and voltage of the charged matter, the greater the intensity by which the electromagnetic field could be altered. Only then could a more terrifying universal gravitation manifest, making gravity more powerful, and only then would there be a slim possibility of developing gravitation and repulsion.
Regardless of increasing the power of the High-Energy Electromagnetic Cannon or universal gravitation, the prerequisite was to master stronger currents and voltages. But the Op-Op Fruit couldn't directly manipulate lightning. Developing the high-frequency surgical knife was already a derived ability, making it difficult to further improve or extend.
"Do these abilities' power have to stop here?" Law was very unwilling. These abilities were too strong; how could he bear to give them up? But their current power level was simply insufficient for battles with top-tier powerhouses. If he relied on the Op-Op Fruit to slowly improve his control over current and voltage, it would be too slow. Spending a lot of time and effort might not even yield much improvement. It would be better to focus time and effort on physical training, which would bring greater increases in strength.