"Ahhh!" Harry Potter looked like he wanted to say something, but the pain was so intense he couldn't speak, only let out a pained howl with a contorted face.
Roger could roughly guess what he wanted to say: "This magic is like this at the beginning, it'll be fine in a bit. As they say, when Heaven is about to place a great burden on a person, it first tests their resolve, strains their muscles and sinews..."
While comforting him, Roger used spells to restrain Harry's entire body, preventing him from moving wildly. At the same time, he brandished his wand, beginning his magical modifications on Harry.
Roger's path of Transfiguration for eternal life currently had two major challenges. One was the issue of the scope of spellcasting; his casting scope was limited to the cellular level due to his method of perception.
The second was that he needed a substance that could be controlled by his will and used for body modification.
Roger's solution was simple. He had no immediate ideas for modifying the body's substance, but there was something on the human body that was already controlled by will... neurons, used by the brain to control limbs!
So, could he deform and strengthen the human body's neurons themselves?
Humans could control the peristalsis of their internal organs, the release of glandular hormones, and various other underlying bodily mechanisms. However, most of these control permissions were not held by the human's conscious mind but were managed by the subconscious.
If he were to modify his own nervous system to a certain extent, could he unlock more bodily permissions? And once the bodily permissions reached a certain level and were strengthened, could that also solve the problem of perceptual scope? Roger didn't know.
But as a potential solution, it was worth trying.
The advancement of science and technology stemmed from continuous practice.
... Besides, sometimes things happened where research into medicine to solve heart disease inexplicably led to other discoveries.
If he was diligent with experiments, perhaps one day he would unlock key technology in some unexpected area? Anyway, no matter the path ahead, taking action was better than doing nothing. With his innate Experimental Sacred Body, it would be a waste not to fill his experimental schedule.
After a period of study, Roger had created a semi-finished product: Magical Neuron Reconstruction Technology.
This was the abbreviation; the full name was 'Technology for proliferating, structurally optimizing, and reconstructing the operational logic of the entire nervous system based on Transfiguration magic.'
This technique was quite complex. If Roger hadn't possessed the ability to sense danger and forcefully break through trial-and-error, it would have been truly difficult to develop.
The specific effects were...
After howling for several minutes, feeling like his throat was about to go hoarse, Harry finally felt his pain lessen.
Although his entire nervous system was still burning, with a slight stinging sensation, compared to how it felt before, it was like being in heaven.
Roger waited for a moment, until Harry had somewhat recovered from the daze of pain and could understand what was being said, then he began to explain.
"Because the technology I'm currently developing isn't mature enough, I haven't performed overly deep modifications on you. I've only slightly optimized the neural structure of your limbs and muscles. It doesn't involve glands, internal organs, or anything else. Now, follow me and raise your hands."
Because the modifications Roger performed on Harry were simple, primary ones, the process was short and didn't have side effects like Roger's temporary, greatly amplified sensory perception, which made wearing clothes feel like torture.
Harry instinctively followed Roger's movements.
"One, two, three, four, five..." Roger held up his fingers one by one.
"Five, three, one, four, two... Very good, now, we're going to speed up." The next moment, Roger, with a speed comparable to the hand seals of Itachi Uchiha in Naruto, began to randomly change the number of fingers he held up. To Roger's surprise, Harry kept up perfectly, not missing a single movement.
"It seems your fingers are fine, so next are your limbs."
Backflip, mid-air triple kick, one-handed handstand, two-finger handstand, jungle parkour, rock climbing with bare hands... The two ran a lap along the edge of the Forbidden Forest.
When Harry finally came to his senses and looked at the palms of his own hands, he was completely stunned.
"Was that... me just now?!"
Anyone who had engaged in fine motor work would understand what a terrifying talent it was to be able to perfectly control one's limbs!
To use a more familiar analogy, if Harry were to become a craftsman now, he would possess the fine motor skills of an 8th-level fitter right from the start, making him a human CNC machine! If he were to participate in a ball sport, he would learn any technique just by watching. As long as his stamina held up, other players would have no chance.
If this were a martial arts world, it would be as if Roger had cast a spell that turned Harry into a martial arts prodigy.
"How is it, pretty good, right?"
"It should be a bit easier for you to use magic from now on," Roger said with his usual kind smile.
Since Harry had helped him, and the backup Elixir of Life path had been smoothly outsourced to Hagrid, Roger never made those who helped him suffer losses.
In Roger's view, the most crucial advantage of this modification wasn't turning Harry into a sports all-rounder, but making his spellcasting smoother.
"Use magic?" Harry asked, a little confused.
"Yes, try it, you should be able to do it too." As Roger said this, his first word was in a girlish tone, the second in an elderly tone, and the last in a deep male voice.
Normal wizards cast spells by waving their wands and chanting incantations. Both steps required great care. Mispronouncing a syllable, the angle of the wand not matching the spell's requirements, could result in anything from a failed spell with no effect, to a direct explosion, or even more terrifying consequences!
After Roger optimized Harry's nervous system, he could not only perfectly control his limbs but also perfectly control the muscles of his vocal cords. If he entered a singing competition now, he could even perform the 'Master of Ventriloquism' without issue. Waving his wand and chanting incantations would absolutely never result in a technical error.
Offering Galleons, Butterbeer, and Wizard's Chess as thanks? Roger felt those things were too common. Only this, he felt, was a fitting return gift for a Seer! By the time Roger and Harry had completed all the adaptation processes and functional explanations, they had just exited the Forbidden Forest and returned to the central area of Hogwarts Castle.
"Harry, I'm going back to continue my experiments. If you ever need help with anything, feel free to come find me," Roger said, friendly patting his still somewhat small shoulder.
Although Roger believed he had repaid this favor, why would he seek closeness when needed and act cold as if discarding worn-out shoes when not? Since a relationship had already been established, it naturally needed to be maintained.
After chatting for a while longer upon returning to the campus, Roger waved goodbye and continued with his experiments. While modifying Harry, he had gained new inspiration for magical experiments.
"Neurons, self, thought speed, Mental Power... I wonder if it'll work."
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