Watching the Little Ten-Tails behave so obediently, Uchiha Ensei still had some concerns, but at this moment, he did not have much right to question it.
After telling the Little Ten-Tails to stay put, Uchiha Ensei began setting up a barrier throughout the underground space, while leaving Flying Thunder God marks in hidden corners.
The process of setting up the barrier was lengthy. Uchiha Ensei's Sealing Jutsu skills were fairly good, but compared to Kushina Uzumaki's, they were still far inferior.
Moreover, barriers generally required many sealing shinobi to set them up together.
Uchiha Ensei was alone, and his standards for the barrier were high, so the slow progress was perfectly normal.
Once the barrier was complete, Uchiha Ensei took out four artificial human puppets.
Numbers One, Two, and Three had each been sealed with a portion of Tailed Beast chakra. Though it was not much, it was more than enough to briefly deal with enemies at a critical moment.
And even if they could not win, they could join forces with Number Four to cast the Four Red Yang Formation.
That technique could withstand even the Tailed Beast Bombs of ten Tailed Beasts. It would certainly be enough to hold off enemies for a while.
Next, Uchiha Ensei arranged other measures as well, such as Exploding Flies, Patrick Star, explosives, and other technological items.
By the time he had finished everything, three days had passed.
During that time, the Little Ten-Tails remained obediently where it was. Apart from conveying its hunger whenever Uchiha Ensei approached, it made no other movements.
After some thought, Uchiha Ensei had the Little Ten-Tails separate off a small piece, then sealed it away.
Afterward, he carved several hundred Flying Thunder God marks onto the Little Ten-Tails and buried a Flying Thunder God Kunai inside its body.
Only then did Uchiha Ensei allow the Little Ten-Tails to absorb the Natural Energy within the space.
Because the Dragon Vein Seal had been leaking for three days, the Natural Energy here had naturally become extremely abundant. Yet before Uchiha Ensei gave the order, the Little Ten-Tails had still not chosen to consume it.
Judging from that, the Little Ten-Tails should be trustworthy.
However, Uchiha Ensei believed he still needed to remain as vigilant as possible.
Two more days passed, and the food Uchiha Ensei carried with him was nearly depleted. He used Flying Thunder God to replenish his supplies in a town within the Land of Fire.
Out of caution, Uchiha Ensei activated the Byakugan's x-ray vision, then discovered several White Zetsu lurking beneath the town.
What a stroke of luck!
Uchiha Ensei was overjoyed, but he still pretended to know nothing and left the town.
Only when the White Zetsu came within roughly one hundred meters of him did he pretend to notice them and capture one in a single move.
After one White Zetsu was captured, the others hurriedly fled.
Just as Uchiha Ensei thought he would only gain one White Zetsu today, another White Zetsu suddenly came within roughly one hundred meters.
It was obviously testing him.
Uchiha Ensei did not hesitate and immediately moved to capture another one.
Then, as if he had suddenly thought of something, he swiftly moved around the area. Whenever a White Zetsu entered within one hundred meters of him, it was immediately captured.
After he caught two in a row, the remaining White Zetsu finally burrowed more than one hundred meters underground.
After wandering around twice without "discovering" any more White Zetsu, Uchiha Ensei decisively returned via Flying Thunder God to the laboratory located within the Uchiha Clan.
The various equipment was still there, but the signs that the laboratory had been searched were extremely conspicuous, as though there had been no intention of concealing them at all.
Konoha's people? How interesting.
After placing the scroll sealing the White Zetsu in a hidden compartment, Uchiha Ensei did not hesitate in the slightest. He used Flying Thunder God to arrive at a concealed corner on the border between the Land of Fire and the Land of Lightning.
Only then did he use Flying Thunder God again to return to the Rōran Ruins.
After observing for several days, Uchiha Ensei finally ordered the Little Ten-Tails to head toward the Dragon Vein Seal.
He also instructed it not to damage the Dragon Vein Seal and only absorb the Natural Energy leaking from it.
Then, Uchiha Ensei threw two cloned bodies containing Byakugan and Hyuga Clan bloodlines into the Little Ten-Tails' body, allowing it to cultivate them in a targeted manner.
For the following period, Uchiha Ensei extracted large amounts of ocular power every day from the hundred thousand Byakugan within the Eight Trigrams Seal in his body, using it to nurture the clones inside the Little Ten-Tails.
Sure enough, with the Little Ten-Tails' help, the Tenseigan's gestation progressed much faster.
Finally, after several months, the third gestation ended, and the power of the Tenseigan finally emerged.
Eagerly, Uchiha Ensei used the Spirit Transformation Technique and entered one of the bodies. There was some slight discomfort at first, but he soon felt a wave of ease wash over him.
At that moment, it was as though his entire soul had been cleansed.
After Uchiha Ensei tested it, that indeed seemed to be the case. His spiritual energy had suddenly increased by a great deal, likely due to feedback from this body.
Next, Uchiha Ensei tried the second body.
This time, there were no other changes. He merely felt that his adaptability to the body had become stronger.
Over the following period, Uchiha Ensei began testing the Tenseigan's abilities and the limits of its combat power.
In terms of power, it had certainly reached the level of the Rinnegan. In some respects, it even surpassed it, such as being able to condense Truth-Seeking Orbs.
However, compared to the Rinnegan, the Tenseigan seemed somewhat lacking in endurance. If used in all-out battle, it could only be sustained for a relatively short time.
Of course, that short duration was only in comparison to the Rinnegan.
If measured in chakra, it was roughly equivalent to the chakra of half an Eight-Tails.
Once the Tenseigan's chakra was exhausted, it would need to draw power from the Byakugan sealed inside Uchiha Ensei's body, or absorb external chakra to replenish itself.
The Tenseigan did not possess the ability to recover its power on its own.
Like the Rinnegan, the Tenseigan possessed the power to absorb chakra. It did not even require physical contact, only that the target be within a certain range.
As a weapon for the current stage, the Tenseigan had many shortcomings, but in terms of combat power alone, it was undoubtedly qualified.
At the same time, Uchiha Ensei tested the limits of the Spirit Transformation Technique and discovered that as long as he carried enough chakra, he could go months without returning to his original body.
But Uchiha Ensei would not abandon his original body. This was merely a temporary measure.
Incidentally, he planned to have the Little Ten-Tails cultivate his body in every aspect. If possible, he hoped to give it the supreme talents of the Ōtsutsuki Clan.
After conveying his thoughts to the Little Ten-Tails, Uchiha Ensei watched as it slowly swallowed his body bit by bit.
After thinking it over, Uchiha Ensei tossed the two Mangekyō Sharingan in as well.
Rather than eyes that would awaken unknown abilities, it would be better to choose Kamui and Kotoamatsukami. But whether it would succeed depended on luck.
He dispelled the Spirit Transformation Technique and returned to his original body once, feeling what it was like inside the Little Ten-Tails. Only then did Uchiha Ensei use the Spirit Transformation Technique again and enter the clone.
For the next few years, he would likely be using this body.
After placing the other body with the Tenseigan into the Little Ten-Tails as well, Uchiha Ensei took one last reluctant look before finally deciding to return to Konoha.
Before you continue