Besides, learning an S-Class Secret Ninjutsu at a glance, such a person is unlikely to exist in the world.
No matter how you look at it, if such a person did exist, it would be too exaggerated.
Even the copying ability of the Sharingan can't achieve that.
A few days later, Hakushi finally touched upon the threshold of the Spirit Transformation Jutsu.
Even though he only touched a bit of the threshold, Hakushi felt he benefited greatly.
The Spirit Transformation Jutsu not only allows one to utilize their spiritual body to control the enemy's mind but also has the power to intrude into and destroy others' mental worlds.
Since it can lock onto targets over long distances, it also has an excellent wide-range perception ability.
Currently, Hakushi only needs to form seals, let go of his thoughts, and he can sense everything within a twenty-meter radius around him.
This kind of ninjutsu, as if granting him a God's perspective, gives Hakushi more confidence in his future tailed beast research.
Hakushi's goal is very clear, whether it's the basic Genjutsu: Naraku Observation Jutsu or the Spirit Transformation Jutsu, the purpose is to further explore the nature change of Yin Attribute Chakra for his research.
While Hakushi was freely perceiving the outside world with his consciousness, suddenly a sharp pain struck his head, continuous warning signals prompted him to quickly cut off the chakra and stop sensing the outside world.
"Whew... only eleven seconds? As expected of an S-Class Ninjutsu from the Sealing Book, with my current ability, I can't even comfortably use it at the introductory stage."
Hakushi is now only able to preliminary sense the outside world and cannot even remotely lock onto targets, let alone use his spiritual body to attack a target's mental world or perform the more complex task of controlling an enemy's mental world.
The achievement is far from reaching a level to be complacent for the complete Spirit Transformation Jutsu.
Moreover, this Spirit Transformation Jutsu has a significant risk, which is when perceiving and the spiritual body attacks, the main body falls into a state where it cannot move or defend.
Therefore, the ninjutsu can only be cast smoothly when there are safe and reliable teammates around.
Furthermore, the longer the spiritual body leaves the body and the farther it travels, the more chakra is needed.
Despite its powerful capability, applying it is quite troublesome.
For the caster, it's a double-edged sword that holds both strength and risk.
Fortunately, Hakushi's primary purpose in learning this ninjutsu is to further understand the nature change of Yin Attribute Chakra for research purposes.
Even if the Spirit Transformation Jutsu proves to be of little practical use in combat, as long as it has high research value, it's more of a benefit than a liability for Hakushi.
Just then, the voice of an experimental subject came from over there:
"Lord Hakushi, the experimental data has been updated."
These five experimental subjects have now become adept at following Hakushi's ideas, working alongside him.
Although it seems unbelievable, their physical condition is now far superior to ordinary people, and with just some physical moves, they can defeat a standard Genin.
Thus, these five individuals are not only Hakushi's precious experimental subjects but also his safe and reliable research assistants.
While Hakushi researches the Spirit Transformation Jutsu, the five of them conduct experiments based on the steps Hakushi previously wrote down.
Hakushi composed himself, approached, and saw the computer screen displaying multiple fusion data about the Immortal Technique, with a 37% success probability standing out prominently.
Despite gathering Ruri's physical data from her prior attempts with the Immortal Technique, including the positive and negative impacts of Sage Art Chakra on the human body, this success rate still leaves Hakushi unsatisfied.
Compared to before, there has indeed been significant progress, but this probability doesn't present enough of an incentive for Hakushi to embark on Immortal Technique training immediately.
Ruri's prior attempt can be seen as both a success and a failure—the success being in the release of the Immortal Technique, but the failure lies in the resulting turmoil of Sage Art Chakra within her body.
It's of certain reference value, but it can't be deemed correct.
"Lord Hakushi, this is the highest fusion value so far."
Seeing the dissatisfaction on Hakushi's face, an experimental subject softly spoke.
"I don't mean to blame you all, after all, the steps were arranged by me. It seems I need to switch to another approach for deduction. Never mind, how are the results of Experiment No. 2?"
Experiment No. 2 refers to testing whether death occurs when chakra is lost.
Upon hearing Hakushi's inquiry, another experimental assistant responsible for Experiment No. 2 replied, "Most of the test mice are dead, though there is one peculiar mouse..."
"Peculiar?"
Hakushi walked over and found a test mouse convulsing desperately inside a glass case, and despite having its chakra extracted, it did not immediately die.
Hakushi observed with interest.
Though this test mouse appeared to be on the verge of death, the fact remained that it didn't immediately perish following the chakra extraction.
"What's going on?"
The experimental subject scratched his head awkwardly and said, "It's my fault for accidentally grabbing the wrong syringe earlier and injecting this mouse with a different potion..."
As soon as he said that, the mouse's body inside the glass case ceased twitching and lay still, dead.
Hakushi picked up the incorrect syringe, which still contained residue of the potion.
Staring at the syringe, Hakushi muttered softly, "Vitality Potion, huh..."
The main component of this Vitality Potion is a specially processed substance that allows life forms to absorb Natural Energy.
Hakushi's expression became peculiar.
He had previously considered replacing chakra with Natural Energy as a life energy supply for the test mice.
Yet the result was that every one of the hundred or so mice died without exception after chakra was extracted.
Following that, he stopped using Natural Energy as a chakra substitute in experiments and instead focused on the relationship between chakra and the human body.
So what is happening now?