In Sarutobi Asuma's understanding, "Mind Reading" was about sensing the thought waves of others to gather information and know their thoughts.
However, "thought waves" was still too abstract.
Sarutobi Asuma thought of another term.
Bio-electricity!
"Tsunade-nee-chan's Body Disturbance actually interferes with the transmission of bio-electricity in the human body, meaning the signal transmission of various parts of the body, which is why it allows people to lose control of their bodies!"
Sarutobi Asuma quickly found a lead.
Body Disturbance was an entry point.
Furthermore, if he truly wanted to develop the divine ability of "Mind Reading," he first had to thoroughly research human bio-electricity.
"To research bio-electricity and decode the transmitted signals, I have Level 10 Lightning Style Chakra Nature Transformation now, so I can use myself as a research subject and explore it bit by bit."
"After analyzing bio-electricity, the next step is perception... I'm afraid Lightning Style alone won't be enough."
"I will also need to master Magnet Release, no, to be precise, Electromagnetic Release!"
Sarutobi Asuma pondered inwardly, "Moreover, the bio-electricity of the human body is also related to the human body's magnetic field, and even the external magnetic field."
"This will have to be done step by step."
"And, overall, 'Mind Reading' should actually be considered a type of Sensory Ninjutsu, right?"
As he thought, Sarutobi Asuma's attention inevitably returned to Sensory Ninjutsu.
He had previously raised his Wind Style Chakra Nature Transformation to Level 10 and his Chakra Control to Level 11, all to thoroughly perfect his Wind Style Sensory Ninjutsu.
Yesterday, he was on the verge of success, but the outbreak of war interrupted his progress.
"On the battlefield, the strength of perception is extremely important, especially in the dark."
"I need to completely perfect my Wind Style Sensory Ninjutsu first and make up for my shortcomings."
"Also, in the darkness, can I use the principle of thermal imaging for perception?"
As he thought, Sarutobi Asuma couldn't help but let out a wry smile.
He had too many ideas, but only one brain.
"One by one, I'll get the Wind Style Sensory Ninjutsu done first!"
Sarutobi Asuma dismissed other distracting thoughts, lowered his gaze, and continued the final step of his attempt from yesterday.
Soon, his Wind Style Chakra merged into the air. To be precise, it merged into the nitrogen gas that made up the largest proportion of the atmosphere.
This was Sarutobi Asuma's choice after long contemplation.
Because the composition of the atmosphere itself was very complex, if he wanted to perceive stealthily, he naturally had to refine his approach.
Once the Wind Style Chakra merged into the nitrogen, it quickly spread, like ink spreading through water.
Moreover, Sarutobi Asuma could control the direction, speed, and scale of this diffusion and infiltration at will.
This was unlike his previous Wind Style Sensory Ninjutsu, which relied on airflow and couldn't be truly controlled freely.
Furthermore, this method of perception, while covering a wide area, was also extremely detailed.
Soon.
Sarutobi Asuma sensed the figures outside the tent.
Moreover, this perception was different from his previous Wind Style Sensory Ninjutsu.
Previously, he could only sense Chakra.
But now, the first thing he sensed were human outlines.
This surprised Sarutobi Asuma a little. He then willed his Chakra-infused nitrogen to meticulously envelop the human outlines he sensed.
Instantly, the perceived human outlines became clearer.
Finally, the distinct facial features and figures of each person appeared in Sarutobi Asuma's mind, which made him very happy.
Although this perception lacked color, as long as it was someone familiar, he could recognize them at a glance.
"What a pity, it's a bit of a chicken's rib!"
After being happy for a while, Sarutobi Asuma sighed inwardly again.
This detailed perception consumed more time and Chakra, and most of the time, it wasn't necessary.
Because sensing Chakra was actually enough.
"Let's test the speed and range."
After getting used to it for a while and confirming that this perception method matched his expectations, Sarutobi Asuma immediately proceeded with further testing.
Chakra continuously merged into the air, spreading rapidly.
A hundred meters!
Three hundred meters!
A mile!
Three miles!
Five miles!
In less than 10 seconds, Sarutobi Asuma's sensory range extended to five miles.
Furthermore, his perception covered a 180-degree frontal range.
He could even cover a 360-degree blind spot, but it would double his Chakra consumption.
"With my normal amount of Chakra, a 360-degree blind spot perception within five miles shouldn't put too much strain on me and won't affect subsequent battles."
"But beyond that range, Chakra consumption will rapidly increase."
Sarutobi Asuma continued to experiment, and after half an hour, he finished.
This also marked the complete perfection of his previously severely flawed Wind Style Sensory Ninjutsu!
"I'll call it the Ink Dyeing Sky Dizziness Technique!"
Sarutobi Asuma officially named the sensory ninjutsu, no longer casually referring to it as Wind Style Sensory Ninjutsu.
What surprised him was that the completion of the Ink Dyeing Sky Dizziness Technique this time yielded him 150,000 experience points at once.
This was even more than what he gained from finishing the development of the Wind Style: Rasenshuriken previously.
However, the difficulty of this technique was indeed considerably higher than the Wind Style: Rasenshuriken.
At the very least, when he had level 10 Chakra Control before, he hadn't been able to perfect this technique.
"Should this be considered an SS-Rank Ninjutsu?"
Sarutobi Asuma felt quite proud.
This technique was also a ninjutsu he had completely developed on his own!
"Developing ninjutsu and fighting really yield experience points the fastest!"
Glancing at the system panel again, Sarutobi Asuma sighed inwardly.
He currently had two more ninjutsu, or divine abilities, that needed developing.
The first was the previously mentioned Nine Dragon Divine Fire Cover.
The other was the Mind Reading he had just conceived.
If he could develop these two ninjutsu, the experience points gained might reach 500,000, or even a million.
Unfortunately, it wasn't easy to develop either the Nine Dragon Divine Fire Cover or Mind Reading.
"Besides developing ninjutsu, there's also creating a Kekkei Genkai."
Sarutobi Asuma pondered inwardly, "My next target should be Magnet Release, or Electromagnetic Release."
"However, Electromagnetic Release should be considered a Kekkei Tōta?"
In his memory, the Magnet Release mastered by the Third Kazekage and Fourth Kazekage only possessed one characteristic of magnetic fields.
For example, the Third Kazekage manipulated Iron Sand.
The Fourth Kazekage manipulated Gold Dust.
Additionally, there were Magnet Release ninjas in Kumogakure who imbued objects with magnetism.
"The three Magnet Release ninjas I know of, their Magnet Release seems to be formed by the fusion of Wind Style and Earth Style?"
Sarutobi Asuma frowned slightly.
The development of a Kekkei Genkai cannot simply be expressed with a formula like Fire Style + Wind Style = Scorch Release.
With his current understanding of Chakra Nature Transformation.
Setting aside Yin and Yang nature transformations for now.
The inner meanings of Wind, Fire, Water, Earth, and Lightning, the five Chakra nature transformations, represent the material forms.
For instance, Water Style can create water.
But Water Style is not directly equivalent to water.
The fundamental principle of Water Style should correspond to a state of matter, the liquid state.
Therefore, Water Style ninjutsu can create not only water and mist, but also other liquid substances like oil.
Wind Style represents gaseous matter, and cutting is just a characteristic derived from the gaseous state.
For example, the Ink Dyeing Sky Dizziness Technique, recently perfected by Sarutobi Asuma, belongs to Wind Style. To put it plainly, it transforms Chakra into nitrogen gas, which then merges with the nitrogen gas in the air and continuously spreads out to achieve the effect of perception.
Lightning Style represents plasma, one of the four common states of matter.
Fire Style is somewhat special; when the temperature is high enough, it can become plasma.
Sarutobi Asuma classified it as plasma.
The five common Chakra nature transformations represent the characteristics and properties derived from the four basic states of matter.
"If nature transformations correspond to the properties of material states, then the essence of ninjutsu is creation!"
Sarutobi Asuma muttered inwardly.
For instance, Water Style.
Most Water Style ninjas need to be in an environment with water to freely use Water Style; this kind of Water Style is actually injecting Chakra into water and then manipulating it.
However, ninjas like the Second Hokage and Kisame Hoshigaki can directly create large amounts of water.
Also, Sarutobi Hiruzen, the father of Sarutobi Asuma and the Third Hokage, created earth directly from Chakra when he fought against the reanimated First and Second Hokage using Earth Style.
This is a perfect example of Energy-Matter Conversion, truly creation!
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