Back at the Eternal Life Base, Lin Yu sent a message to everyone: "Cultivate, improve your strength, the final battle is coming."
Not only did the peak combat power need to be enhanced, but the thawing process of Naruto, Sasuke, and Haku also needed to be accelerated. Kakashi, Minato Namikaze, and Jiraiya also needed to boost their strength.
However, this was still an era of Sharingan. Without touching upon the Ōtsutsuki, their combat power would be capped, and it would still be too difficult to participate in battles at the Six Paths level.
Therefore, Lin Yu found Orochimaru and Tobirama Senju.
"Enhance combat power, forbidden jutsu?"
Orochimaru and Tobirama Senju were stunned. Orochimaru chuckled first, "The final battle? Interesting. The way to break through one's limits is simple: let those without kekkei genkai possess a pair of Sharingan, and then combine them with cells from Hashirama Senju or the Ōtsutsuki, and their strength will quickly surpass that of a Kage-level."
Tobirama Senju was not angered by Orochimaru's blatant mention of Hashirama Senju's cells. Not to mention others, even he himself wanted to research his elder brother's cells, even to the point of splitting his brother's head open to see what his brain stem cells looked like.
"Forbidden jutsu are classified as forbidden for two reasons: one is the degree of harm, and the other is the high difficulty of cultivation, or significant self-harm. People without special talent or physique can't master them at all, or it will cause irreparable damage to their bodies. For example, the Flying Thunder God Technique, or the Mutually Multiplying Explosive Tag. The power is immense, but it might not be of much use in top-tier combat."
Tobirama Senju crossed his arms. He had never encountered the Ōtsutsuki clan, nor had he fought them, so he was somewhat confused about the final battle.
However, seeing Lin Yu's solemn expression, he said truthfully, "I don't really approve of cultivating forbidden jutsu. Although I created most of them, the difficulty of cultivating forbidden jutsu is too great, and it takes too long. The disadvantages outweigh the advantages, and it's not worth the effort."
Lin Yu nodded. What Tobirama Senju said made sense. However, it would likely take some time for the Ōtsutsuki to descend upon the ninja world, not too long, but not too short either. Thus, forbidden jutsu like the Mutually Multiplying Explosive Tag, which harms the enemy while also damaging oneself and is not too difficult to learn, could be given to everyone.
But the introductory difficulty for the Impure World Reincarnation was high. However, with Orochimaru, Kabuto, and Tobirama present, it would be sufficient.
"So, we still need to improve our strength from the root, and that brings us back to the beginning, the Rinnegan..."
Although the Rinnegan was not essential for fighting the Ōtsutsuki, it at least offered a degree of self-preservation. Against the Ōtsutsuki's incomprehensible and brainless dōjutsu, only dōjutsu of a similar level could be used to counter them.
While taijutsu was also a method to counter the Ōtsutsuki, apart from the Death Gate of the Eight Inner Gates, the others were essentially useless. Even the Death Gate, once its drawbacks were understood, could easily be circumvented by the Ōtsutsuki's spatial manipulation abilities.
Furthermore, the Rinnegan could absorb all chakra nature transformation ninjutsu, making the study of S-rank ninjutsu unnecessary.
If they were to learn something, it would have to be Hashirama Senju's Wood Style, the Susanoo of the Sharingan, or the Tenseigan Chakra Mode of the Tenseigan. However, these three abilities were exclusive to their respective bloodlines.
To obtain them, it would likely require the power of research.
"The final battle... Lin Yu-kun, are you sure?" Orochimaru's golden vertical pupils narrowed, lost in thought.
"The old toad from Mount Myōboku said so. Time is running out," Lin Yu decided not to conceal it. He too felt a sense of stillness in the air.
"Then we really need to make some changes." Orochimaru stopped talking and returned to the laboratory.
Lin Yu and Tobirama Senju also left the laboratory. Lin Yu still needed to gather those idle people on vacation and, incidentally, assign a task to Black Zetsu.
In the dimly lit laboratory, Orochimaru sat in his chair, staring intently at the desk, pondering something.
"It's such a pity. If only I had a few more decades..."
Orochimaru sighed. The desire for power deep within him still lingered, though he had buried it well, undiscovered by anyone.
"But then Jiraiya would definitely stop me. What an idiot. What a shame..."
...
A few days later, a young man was brought to the Eternal Life Base by Black Zetsu. Although he looked young, his expression was calm and composed, showing no signs of fear. He even displayed a strong curiosity towards the dark Black Zetsu behind him, his eyes occasionally glancing backward.
What is this thing? A new human? Or a mutant?
This person was one of the suspects Lin Yu had asked Black Zetsu to find: the genius scientist, Amado, who was now only in his early twenties but had already made advancements in cloning technology.
"The technological level here..."
As he walked through the Eternal Life Base, Amado's gaze was involuntarily drawn to the design within. There were technological buildings with a retro style, as well as instruments with avant-garde scientific advancements. It was a super fortress that combined retro and futuristic styles!
"I really want to meet the owner of this place."
"I am the owner of this place. Are you Amado?"
Lin Yu walked out from the depths, followed by a young man with a deep expression.
Lin Yu sized up Amado, not saying much, as there was no need. "Shisui, it's up to you."
Shisui, standing behind Lin Yu, nodded. He stepped forward, and the black pupils in his eyes gradually turned into crimson Sharingan. Then, a pinwheel-like pattern appeared in his pupils, and he gently rotated them towards Amado.
"Kotoamatsukami!"
And it was the left eye's Kotoamatsukami, which permanently alters the will of others.
Lin Yu didn't have the time to investigate Amado's background, nor did he care if Amado would be a hidden boss later. As long as he fell under Kotoamatsukami, he would be one of them. If he resisted, it would be a perfect opportunity to kill him.
Amado inexplicably glanced at the young man before him. For some reason, he felt a sense of fear and panic in his heart. His footsteps slowly shifted, wanting to flee, but it was too late. Kotoamatsukami activated, Amado's pupils became vacant. After a few seconds, he regained consciousness, but his attitude was completely different from before.
"Boss, what is my task today?"
Yes, Shisui had implanted the will of becoming a laborer for the Eternal Life Organization into Amado. For intelligent people, the more complex the will, the more they would suspect it. Conversely, a simple will, logically sound, coherent, beneficial to oneself, and without drawbacks, would not be overthought.
Amado was a scientist. What does a scientist need to research technology? Money, experimental materials, precision instruments. All of these could be obtained at the Eternal Life Organization.
Lin Yu smiled, "This is a long-term mission. You will need to cooperate with Orochimaru to clone or cultivate Rinnegan."
Amado's expression was calm. Kotoamatsukami had not changed his personality. "I'd like to meet that Orochimaru first before considering anything else."
Direct and calm, this was also Amado's personality.
"Of course."
Lin Yu nodded to Shisui, who silently retreated. Although Kotoamatsukami was cast on ordinary people, the permanent use of Kotoamatsukami was a great drain on Shisui, and he needed to rest for a while.