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"Assimilation, huh!"
After seeing Kakuzu's memories related to the Earth Grudge Fear secret technique, Kenshi knew the key to why Kakuzu could steal other people's hearts and achieve immortality without causing a rejection reaction.
It was assimilation!
As everyone knows, taking over someone else's body will cause a rejection reaction.
The Body Snatching Technique in the Spirit Transformation Technique is because of the rejection reaction. After possessing someone else's body, you won't live long before you die.
The reason why the Third Hokage kept asking Kenshi about the improved version of the Spirit Transformation Technique was because when Kenshi possessed Kimura Yō's body, there was no rejection reaction. The Third Hokage thought that the Spirit Transformation Technique Kenshi knew was an improved version. Body Snatching wouldn't cause a rejection reaction. It was an immortal secret technique that could allow you to possess bodies and live forever.
Kenshi learned this after obtaining Katō Dan's memories.
Kenshi couldn't solve the rejection reaction between the body and soul after body snatching using the Spirit Transformation Technique.
The same was true for the Reincarnation Technique developed by Orochimaru later. It couldn't solve this rejection reaction either. Every three years, he had to change bodies. Otherwise, his soul and body would suffer great damage. Eventually, his body would die, and his soul would dissipate.
The relationship between the body and the soul is like the relationship between armor and the body.
Changing bodies is like changing armor.
Armor that doesn't fit will damage the body, and it will continue to cause damage.
This is the principle of the rejection reaction between the body and the soul.
The Body Snatching Technique in the Spirit Transformation Technique and the Reincarnation Technique developed by Orochimaru later couldn't solve this side effect.
However, Kakuzu's Earth Grudge Fear secret technique solved this problem.
When Kakuzu stole someone else's heart, the Earth Grudge Fear black lines would modify the other person's heart, assimilating it into a heart that could be controlled by Earth Grudge Fear.
The most amazing thing was that the modification didn't affect the heart's lifespan. A heart that could originally beat for a certain number of years could still beat for the same number of years after being modified.
"Assimilation... it's indeed the best way to solve the body's rejection reaction."
Kenshi's eyes pondered, thinking about whether he could combine the Earth Grudge Fear secret technique with the Body Snatching Technique in the Spirit Transformation Technique to develop a Body Snatching Technique without any side effects of rejection.
Compared to the immortality of Body Snatching in the Spirit Transformation Technique, the immortality of Earth Grudge Fear was something Kenshi looked down upon.
The main reason was that the fatal weakness of the heart was too fatal.
And the chakra attribute was completely dependent on the heart.
Also, one heart could only use one chakra attribute. It was too restrictive.
Of course, there were also some bad aspects to the Body Snatching Technique in the Spirit Transformation Technique.
Combining the two would be good.
"Good, let's develop it!"
Kenshi instantly made a decision. Who wouldn't crave immortality? If he hadn't encountered it, that would be fine. But now that he had encountered it, how could he ignore it?
But there was no rush now. The Perfect Transformation Technique was still Kenshi's top priority.
"Big Brother, your Perception Deprivation Technique is amazing!"
At this time, Yezi descended from the sky. Looking at Kakuzu lying motionless on the ground, she was envious, but a hint of dejection flashed in her eyes.
Such a powerful Perception Deprivation Technique. Kenshi's shadow clone had taught her, but she couldn't learn it no matter what.
Kenshi stepped forward and picked up Kakuzu's other heart. He held both hearts in his hand and activated the Devouring Seal Array to devour the chakra in the hearts.
"If you can't learn it, just work hard to improve the jutsu you've learned." Kenshi said to Yezi with a smile as he devoured Kakuzu's heart chakra.
Compared to the Dark Walk Technique, the Perception Deprivation Technique was not a little bit more difficult.
Not only did it require a perception ability that was so subtle that it could perceive the weak chakra of the brain's nerve conduction system, but it also required a chakra control ability that was so delicate that it could precisely intercept the signals of every nerve fiber, especially the precise control of genjutsu chakra.
In this world, perhaps only Kenshi, whose consciousness had mutated after transmigration, could use the Perception Deprivation Technique.
Speaking of consciousness mutation... Kenshi suddenly paused, his eyes flickering.
He seemed to understand why his body and Kimura Yō's body didn't have a rejection reaction.
It was because his consciousness, or rather, his soul, had mutated after transmigration.
For other people, possessing someone else's body was like changing into a suit of armor that didn't fit, so they would naturally be injured.
But after Kenshi's soul mutated, it might have changed its size to match the armor. That's why his soul was compatible with Kimura Yō's body and didn't cause a rejection reaction.
"Is that it?"
Kenshi was unsure, but he felt in his heart that it should be so.
If that was the case... wouldn't that mean that he could now use the Body Snatching Technique in the Spirit Transformation Technique, possess someone else's body, and his soul would automatically change to match the other person's body, allowing him to continue living in that body?
"This..."
It has to be said that this was a great temptation, but Kenshi didn't dare to experiment. What if he died? It would be a wrongful death.
But... if he was in a desperate situation, he could try it.
After a while, the chakra of Kakuzu's three hearts was completely drained. For Kakuzu, this kind of alternative chakra creature, having his chakra drained meant death.
Thus, a legendary figure was extinguished.
This was the first character from the original work that Kenshi killed.
Katō Dan didn't count. He was a character who lived in memories, and he wasn't really killed by Kenshi. He committed suicide.
Kenshi didn't feel much about killing characters from the original work.
Before, when he read fanfiction, the protagonist always let the original characters go for some inexplicable reason. He felt very uncomfortable.
Now, he understood those fanfictions a little.
Because once the original characters died, the plot related to them couldn't unfold.
It's the same now. Kakuzu is dead. In the future, Asma... well, he's still going to die. With Kenshi around, Asma is still going to die. But Kenshi will make him marry his wife and watch how he gets his wife pregnant before he dies.
Kenshi always cared about whether the families of the Third Hokage experienced enough "happy" memories before they died.
"Let's go, we're going to the Water Country!"
Kenshi called to Yezi. The two of them headed east, towards the Water Country.
This ninja world, under his influence, would definitely be completely different. The future would definitely not be the same as Kenshi remembered.
He only had to improve his strength to survive well in this world, to continue tormenting the Third Hokage, until eternity.
The last time the Five Kage surrounded him, he had already copied the Third Tsuchikage, Ōnoki's Dust Release, and the Raikage's new Lightning Release chakra mode.
Only the Third Kazekage's Magnet Release - Sand Iron Secret Technique and the Third Mizukage's Water Release, Black Water and Water Transformation Technique, which were like the deep-sea pressure, were not copied.
This time, he would first go to the Water Country to copy the Mizukage's jutsu, and then go to the Wind Country to copy the Third Kazekage's Magnet Release.
Along the way, Kenshi encountered ninjas, whether they were wandering ninjas or ninjas from the Five Great Nations on missions. He took them all down, using the Spirit Transformation Technique to possess their souls and perceive their spiritual energy, trying to find out what was different between other people's spiritual energy and his own.
Unfortunately... the expected rapid progress didn't happen.
He couldn't sense any difference in spiritual energy between people. He could already sense the difference between souls, but he couldn't distinguish between spiritual energies.
There was no way around it. Kenshi could only continue.
In this way, they traveled and stopped along the way, and it took half a year for Kenshi and Yezi to enter the Water Country.
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