Tobitake Tonbo's Contact Evolution had been created to save this portion of time, and it allowed for selective evolution.
Yin Release created form from nothingness, extending the nerves and infiltrating the object—or living body—to be invaded. The Mind Reading Technique and Nature Transformation read the target's information and fed it into the nerves.
Then, Second-Generation Heart of Steel filtered all the information, analyzing it with the knowledge he had accumulated over the years.
After the analysis and processing, it was engraved into the nerves.
The body would then evolve in a better direction.
Naturally, this evolutionary process required the knowledge from the Illusory Body Technique he had studied.
It deceived the body into absorbing information, accelerating its transformation instead of requiring generations of inheritance like Kekkei Genkai development.
The Kumogakure ninja corpse beneath his hands was that of a ninja with a Kekkei Genkai.
Tobitake Tonbo intended to absorb the part of his genetic information that strengthened the body's vitality.
Chakra was the product of physical energy and spiritual energy combined, so Tobitake Tonbo's goal was clear: genes related to vitality, which represented the body's physical energy.
As for why he was not pursuing Kekkei Genkai, naturally, every ninjutsu had its limitations.
What he had now was no exception.
If the human body evolved too quickly, it would collapse. It needed time to absorb the evolution.
And the more information there was, the harsher the demands on the body's capacity became. So his goal was chakra—vitality.
Therefore, he only needed to work on this aspect.
Even if he encountered other test subjects, their information could be integrated, because the vitality-related information in people was actually quite similar.
That way, it would not place too much burden on the body.
"Several generations' worth of time, completed in just a few years,