However, all of the above were just Kyuushin's guesses; he had no concrete evidence, so he temporarily set it aside.
But from this Wood Release scroll, Kyuushin did indeed learn a lot; some Wood Release ninjutsu could be directly applied to his Ice Release.
For example, the Ice Clone Technique, Ice Dragon Technique, and even the Ice Man Technique. Furthermore, if he had the chance to learn Sage Mode, even a Wood Release: True Several Thousand Hands could potentially have an Ice Release version.
Kyuushin took out a blank scroll and then pen and ink, transcribing all the useful parts from this scroll. Of course, to be safe, he only wrote down the ninjutsu's concepts and did not include the words "Wood Release."
Although Wood Release was already extinct in this world, it was still a treasure of the Senju Clan, and he didn't want it to be exposed through him one day.
After he finished writing, it was already noon. Kyuushin went to eat, then returned to the study. With the Wood Release part done, he turned his attention to other sections.
After walking back and forth several times, Kyuushin finally pulled out a scroll from the bookshelf labeled "In-depth Development and Application of Summoning Technique."
It wasn't that he wasn't interested in other ninjutsu, but upon seeing the words "Summoning Technique," he already had a guess about the ultimate outcome of this series.
In contrast, other elemental ninjutsu held much less appeal for him. Kyuushin opened the scroll he had just taken down, and its contents indeed piqued his interest.
**"Research on the Differences Between Live Summoning and Dead Summoning"**
Kyuushin read the title aloud, clearly sensing the difference between this scroll and the previous Wood Release scroll. The Wood Release scroll merely recorded Wood Release ninjutsu, like a recipe.
This scroll, however, was clearly the research result of Senju Tobirama, like a thesis. Without a certain level of theoretical learning, one might not even understand it.
However, this was exactly what Kyuushin wanted. He immediately sat at his desk and focused intently on the scroll's contents.
Senju Tobirama's description of the difference between live summoning and dead summoning was simple: live summoning had a time limit, while dead summoning did not.
In exploring this distinction, Senju Tobirama's conjecture was that space itself inherently repelled the transmission of living beings, requiring the maintenance of chakra. Once the summoned chakra was depleted, space itself would directly send the living being back to its original location.
There was also a special phenomenon: when a living being encountered a fatal attack, the summoning would end prematurely.
Senju Tobirama's explanation for this was that signing a live summoning contract inherently included certain conditions, and a fatal attack was one of them. Once this situation occurred, the contract would temporarily become ineffective, directly sending the living being back.
However, there was another situation: some summoned groups could summon each other without a contract, but even if these summoned living beings suffered a fatal attack, they would not return.
But inanimate objects had no such restrictions. For example, storage scrolls were also a relatively special summoning technique; no matter what, your weapon would not suddenly return to the scroll.
However, the content of this scroll ended there, with no follow-up. Kyuushin was somewhat disappointed by this, as the scroll merely distinguished between live summoning and dead summoning.
As for the reason, Senju Tobirama only offered a conjecture, without even providing proof.
However, Kyuushin composed himself; after all, this was only the first scroll, and there were many more to come. Kyuushin took down several nearby scrolls, wanting to see his subsequent research.
**"Research on the Differences Between Summoning and Reverse Summoning"**
**"Summoning Technique: Research on Rashomon"**
**"Research on Rashomon's Special Formula"**
After seeing Senju Tobirama's subsequent research, Kyuushin finally became excited. Although these studies were fragmented, when combined, they subtly hinted at the ultimate outcome.
Kyuushin subconsciously wanted to take more scrolls to study, but looking up, he found that the sky had already darkened. Unknowingly, he had spent an entire day in this study.
Kyuushin shook his head. Although he was mentally exhilarated and even wanted to study all night, he still had his rationality. These research notes were here; it wouldn't be too late to study them anytime.
After all, Mito had already given him the key, which meant he could come whenever he wanted, so there was no need to rush at this moment.
Having understood this, he put away the scrolls, closed the window, and then the door. Only after the barrier jutsu unfolded again did he leave.
In the following days, Kyuushin remained immersed in Tobirama's research, and by following his thought process, Kyuushin gradually uncovered the full scope of the technique.
It must be said that the Second Hokage's talent in ninjutsu creation could indeed be described as astonishing and brilliant. Even with his research notes, Kyuushin sometimes had to think carefully to keep up with his ideas.
And the creation process of the Flying Thunder God Technique can indeed be described as having a unique and ingenious subtlety.[1][4]
The Flying Thunder God Technique seems very simple, just marking a spot in advance and then teleporting there. But when you truly start to learn it, you realize what the most mysterious and difficult ninjutsu is.[2][4]
Leaving aside other things, just the knowledge of sealing techniques and summoning techniques contained within it is so complex that a slightly dull shinobi might not even understand it.
Not to mention its most profound part, the concept of space-time. Many shinobi might never even hear of this term from birth to death, let alone understand it.[4]
As a forbidden jutsu, this technique was much safer than other forbidden jutsu. Therefore, after the Second Hokage created it, it wasn't as if no one tried to learn it.[4]
This included the current Third Hokage Hiruzen Sarutobi, as well as the former Hokage Guards like Danzo Shimura and Uchiha Kagami, but none of them could master this technique.
After many people failed to learn it, Senju Tobirama also listed some conditions for learning this technique, so that future generations could clearly determine if they met the requirements.
The first point was the need to master advanced ninjutsu knowledge. This ninjutsu knowledge included, but was not limited to, sealing techniques, summoning techniques, sensing techniques, etc., to accurately understand the function of each sealing technique in the Flying Thunder God formula.[4]
The second point was to have a superhuman reaction speed, capable of quickly processing information after space-time conversion. Without this, the Flying Thunder God Technique would become a mere teleportation ninjutsu, significantly reducing its practical value.
Finally, and most importantly, was space-time talent. The concept of space-time talent sounds mystical, but it is a real existence.
Without space-time talent, one cannot perceive space-time fluctuations, let alone teleport. The Third Hokage, who met the first two conditions, was hindered by his lack of space-time talent.
However, space-time talent is difficult to detect and can only be understood during the process of learning this technique. Therefore, Kyuushin is currently unsure if he possesses it.
But that's something to be determined at the very end. For now, what Kyuushin needs to do is first meet the prerequisites for this technique.
Kyuushin compared the prerequisites of the Flying Thunder God Technique with his own abilities and found that he already met the conditions for summoning techniques and sensing ninjutsu.
As for sealing techniques, Kyuushin had finished the basic part. Beyond that lay various combinations of formulas, an area where Kyuushin was still relatively lacking, mainly because he had learned relatively few sealing techniques.
However, this didn't prevent him from understanding the function of each formula in the Flying Thunder God Technique; it just made the process slower. In fact, these past few days, besides reading Tobirama's materials, he had spent the rest of his time on this.
Unfortunately, Mito had also been busy these past few days. Her research into Nagato's Rinnegan had hit a bottleneck. According to her, it was difficult to ensure that the sealing simultaneously did not affect its normal function.
Kyuushin naturally couldn't help with such a matter, so to avoid disturbing Mito, he didn't take the Flying Thunder God Technique to consult her.
Nagato's Rinnegan issue was naturally the most urgent matter. Learning the Flying Thunder God Technique could be done anytime, and Kyuushin himself wasn't in a great hurry.
Tsunade had also been rarely seen lately. When asked earlier, she said she was writing a plan. For Tsunade to be so dedicated, it was probably related to the medical reform mentioned in the office before.
Although Kyuushin already knew that even if she wrote it, the Third Hokage wouldn't immediately agree, he didn't interfere. After all, this plan would be useful one day.
Jiraiya did come by two days ago, saying he wanted to learn the Rasengan that Kyuushin had created earlier. According to him, the Rasengan was very suitable for his fighting style and would greatly help improve his combat power.
This was true. Although Jiraiya possessed the strength of an elite jonin, he currently lacked offensive means in both close and long-range combat.
This wasn't apparent when dealing with shinobi weaker than him, but once he faced shinobi of equal or greater strength, this weakness became exposed.
For example, during his previous battle against Hanzo, Jiraiya had many opportunities for close combat but lacked powerful close-range offensive techniques, unable to inflict significant damage on Hanzo.
So, this time, persuaded by Orochimaru, he swallowed his pride and sought out Kyuushin. Although he had been envious before, he was too embarrassed to ask, but after the battle with Hanzo, he had come to a realization.
Kyuushin naturally agreed to this. The Rasengan technique was originally an emergency measure he used against jonin, and now it was almost dispensable for him.
With the Gene Lock's enhancement, the Chidori ninjutsu was even more suitable for him than the Rasengan, but this was in the case of a pure Rasengan.
If he learned Sage Mode and developed the Wind Release: Rasenshuriken, that would be another matter entirely, but Jiraiya was likely still some distance away from Sage Mode.
However, just as Kyuushin thought such days would continue for a while, a sudden piece of news broke this calm.
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