Tsunade took the seal scroll, took Shikamaru and Shizune, and came to the gate of Rinto again.
This time, Tsunade felt more uneasy than ever before. The previous foundations, building materials, and boundaries were all clear engineering issues, which could provide Rinto with clear research data and scenarios. But The sample this time was a completely unknown and weird product of forbidden magic. They didn't even know what it was. They didn't know if it would impress Rinto, let alone whether it would make him impatient and drive them out directly.
But they have no other choice. Of the entire Konoha, or even the entire Shinobi World, only Rinto has the possibility to solve this mystery.
Tsunade took a deep breath, raised his hand and knocked lightly on the courtyard door. His tone was respectful and even a little cautious. "Mr. Rinto, sorry to bother you, we have encountered something very strange and completely incomprehensible. There is a special sample. I would like to ask your help to take a look."
The courtyard gate was quiet for a few seconds, and then Rinto's cold voice came, with obvious impatience. "What sample? If it is Konoha's trivial matter, there is no need to say more."
"Mr. Rinto is a body fragment from the border." Tsunade spoke quickly, speaking very quickly and throwing out the core characteristics of the sample, accurately hitting the research direction of Rinto, "The owner of this sample has the ability to be immortal and infinite. Even if the body is blown to pieces, it can recover instantly. Kekkei Genkai, a long-dead ninja, is still in the body. We have detected traces of the soul that was forcibly bound inside, as well as a completely incomprehensible cell regeneration mechanism. Our entire medical and research system is completely unable to understand its underlying logic."
She paused and immediately added, "If you are willing to study this sample, all the detection data and the complete process of the border attack will be given to you. If we can obtain more relevant samples and information in the future, we will send it to you as soon as possible. All the research results will be yours. We only need to know what the nature of this thing is and whether there is a way to crack it."
After saying that, the three of them held their breath and waited nervously for a response from the courtyard gate. They knew very well that this was their only chance.
After more than ten seconds of silence, the courtyard door slid open with a click.
Rinto stood inside the door, his eyes immediately falling on the seal scroll in Tsunade's hand. The impatience in his eyes completely disappeared, replaced by an extreme and unabashed interest.
Immortal and infinite regeneration, Kekkei Genkai of the dead, and traces of forcibly bound souls. These keywords immediately reminded him of the forbidden technique he had seen in Second Hokage's notes - Impure World Reincarnation.
He originally thought that there was no chance of getting access to actual samples of this banned technique, but he didn't expect that someone would deliver a ready-made sample to his door so quickly.
This is more precious than any sample he has come into contact with before. Rinne Rebirth is a forward soul recall and rebinding, but this sample is a reverse, forced soul binding and manipulation, which involves the application of soul rules that he has never been exposed to before. The infinite regeneration mechanism is also completely different from the cell regeneration of Yang Release, and there must be a new set of logic behind it.
More importantly, the emergence of this sample means that Impure World Reincarnation Jutsu has been re-mastered and put into actual use. That means that more and different types of Impure World Reincarnation samples are likely to appear in the future, and those ninjas of the past generations who possess various Kekkei Genkai and special secret techniques may become his research materials.
"Bring the things in." Rinto stepped aside, with a hint of imperceptible urgency in his tone, "Leave all the test data and detailed reports of the attack."
"Okay, okay!" Tsunade The stone hanging in the hearts of the three of them suddenly fell to the ground. They quickly walked into the yard and carefully placed the seal scroll, the thick test report, and the complete record of the patrol's attack on the experimental table.
Shizune quickly explained all the test results that Medical Squad had done before, as well as the strange situations they encountered, and explained them one by one to Rinto, including those enemies who could use the dead ninja's Ninjutsu, the fact that their bodies could be regenerated instantly even after being blown to pieces, and the detached tissues could still maintain activity and regeneration capabilities. All details were not missed.
Rinto picked up the test report and flipped through it quickly. His eyes swept over the weird test data, and his eyes became more and more interested. These data that Medical Squad couldn't understand and that went against common sense, In his eyes, it just confirmed his guess that this was the product of Impure World Reincarnation, and it was probably an optimized and improved version, much more perfect than the basic technique recorded in Tobirama's notes.
He put down the report, picked up the seal scroll, and penetrated a very thin ray of Chakra, instantly touching the arm fragment inside. His Chakra, much more accurate than Medical Squad's detection equipment, instantly penetrated the tissue of the fragment, penetrated deep into the cellular level, and even captured the weak, forcibly bound soul fluctuations.
Just as he expected. There were two core marks in the fragments: one was the soul mark of the deceased, which was forcibly split into extremely fine parts and locked in every cell. This is why even if only one fragment is left, it can still maintain the ability to regenerate; the other was the control mark of the caster, which was like an invisible shackle, firmly binding the soul of the deceased, while providing a steady stream of energy to support the infinite regeneration of the body.
What's more interesting is that the essence of this body was transformed from the body of the sacrifice, but it was forcibly integrated into the soul of the deceased and the characteristics of Kekkei Genkai, achieving the forced binding of the soul to the strange body. This is completely different from the natural anchoring of the soul and the original body that he studied before.
"I'm keeping this sample." Rinto put down the seal scroll and looked up at Tsunade. His tone was still calm, but with unquestionable instructions, "If you encounter this kind of enemy again in the future, whether dead or alive, even if there are only a few fragments and a little bit of relevant information, send it to me as soon as possible. The more types of samples, the more thorough I can study it."
"No problem! We will definitely do it!" Tsunade immediately nodded in agreement, feeling completely relieved, "Mr. Rinto, then... what exactly is this thing? Is there any way to crack its immortal regeneration ability?"
"This is a forbidden technique developed by Impure World Reincarnation and Second Hokage Tobirama Senju." Rinto said calmly. With just one sentence, Tsunade, Shikamaru and Shizune's eyes widened in shock.
They had all heard of the name Impure World Reincarnation, and knew that it was a forbidden technique developed by Second Hokage, but they never knew that the effect of this forbidden technique was like this, and they never expected that this forbidden technique, which had been banned for decades, would reappear in front of them in this way.
"I will do detailed disassembly research on the specific mechanism." Rinto's eyes have returned to the seal scroll, and his mind has been completely focused on the upcoming research. He waved his hand, "You can go, don't disturb my experiment. I will inform you when I have a clear cracking method."
"Okay, okay, then I'll bother Mr. Rinto, we will never disturb you." Tsunade responded quickly, took Shikamaru and Shizune, quietly exited the courtyard, and closed the courtyard door.
After walking far away, the three of them breathed a sigh of relief.
"Unexpectedly, it turned out to be the Impure World Reincarnation forbidden technique of Second Hokage..." Shizune's tone was full of fear, "The forbidden technique developed by Lord Tobirama back then could actually be used to this extent. It's terrible."
"Fortunately, Mr. Rinto is here." Shikamaru also breathed a sigh of relief, his eyes full of luck, "As long as he is willing to research, we can figure out the principle of this forbidden technique and find a way to crack it. Otherwise, facing this kind of invincible enemy, we have no power to fight back."
Tsunade nodded, his face still solemn. "Immediately notify all patrol teams on the border. If you encounter this kind of enemy again, give priority to ensuring your own safety, bring back samples and information as much as possible, and don't fight. At the same time, immediately conduct a strict investigation to find out who has mastered this forbidden technique and what is the purpose behind it."
"Yes!"
In the yard, Rinto had already taken the seal scroll and walked quickly into the laboratory. He couldn't wait to dismantle the sample of Impure World Reincarnation and understand all the rules behind this forbidden technique.
He first took out the arm fragment from the seal scroll, placed it on the high-precision detection array, and activated his specially designed detection system that could accurately capture soul fluctuations and cell microstructure.
The shadowless lamp turned on, and a light blue beam enveloped the sample. Data that was a hundred times more detailed and a thousand times more accurate than the detection of Medical Squad was instantly refreshed on the light screen. From the fusion of the body's gene sequence, to the regeneration mechanism at the cellular level, to the binding method of the soul fragments, and the structure of the imprint of the caster Chakra, all details were completely captured and recorded.
Rinto is sitting in front of the experimental table, his eyes full of extreme concentration. His fingertips are constantly releasing Chakra in different frequency bands, going deep into the inside of the sample, dismantling the underlying logic of Impure World Reincarnation bit by bit, not missing any tiny detail.
This evil forbidden technique, regarded as taboo by Shinobi World and used to control the dead, in his eyes, is a treasure house containing the rules of the soul, the rules of life and death, and the rules of energy transformation. And his research has just begun.