The dragon vein, like Uchiha Yue, was one of the two sources of energy on this dead planet.
At the moment, Uchiha Yue was studying the principle by which the Dragon Vein connected to parallel worlds. He sought not to get into one of them, but to break through the space-time tunnel in order to transfer his power to another universe.
Based on his perception of space-time, as well as on the analysis and observation of the Dragon Vein, Uchiha Yue has already achieved a certain understanding of how it affects other worlds. Even if this vein runs out, he could easily create a new one.
But it didn't matter. The main goal was a way to break through the space-time tunnel itself.
In the Pure Lands of the parallel world, the Sage of the Six Paths from the main world turned to his doppelganger:
— The other me, it's time to act. We have to fix this mistake!
He had already moved all the souls from his world to the Pure Lands of this world, but he still did not feel at peace. The reason for his concern was the existence of the Uchiha clan.
If something appeared once, then sooner or later it will reappear, while maintaining the conditions that gave rise to it.
It was about Uchiha Yue.
It must be understood that before the awakening of the Mangekyo Sharingan, Uchiha Yue was just an ordinary person. He was not someone's reincarnation, had no patrons or noble background behind him. The blood of the Ootsutsuki clan was so diluted in him that it was almost gone. And such an ordinary person turned into a walking disaster.
What about the other Kekkei Genkai Sharingan holders?
The probability that they would become the next Uchiha Yue was very high. And if a new Yue appears in the Shinobi world now, it will mean real hopelessness, a real catastrophe, because they have nowhere else to run. The dragon vein has become unusable.
Logically, the Dragon Vein from the main world should have been absorbed. In this case, there were two options left: either she would connect to a new world where she had her own home, or she would stop working, making travel impossible.
However, everything turned out to be different. The dragon vein was still active, and it was still possible to enter it.
But that's it. Those who entered it never returned. They disappeared without a trace, as if they had never existed.
What happened?
Perhaps they fell into some kind of space-time crack and died? Or did they end up in the main world, where they found their deaths?
The first option was likely, but the second was absolutely impossible. To move with the Dragon Vein, it is necessary that it also exists in the destination world. Without it, teleportation is an empty phrase.
Anyway, they couldn't leave this world with the help of the Dragon Vein now. And if a new Uchiha Yue appears now, everyone will be finished. After all, this was a monster capable of destroying even an opponent with the might of the Divine Tree without a trace!
—Yes, the time has come," the second Sage agreed. — The Uchiha clan must not be allowed to continue their lineage. This Kekkei Genkai is too dangerous!
— We have always seen only the obvious, great power and believed that the main threat to the Shinobi world is the Divine Tree. Now it is obvious that the true threat is Sharingan. Probably, our knowledge about him is not even five percent!
However, there's nothing you can do about it. Before the appearance of Uchiha Yue, who would have thought that an ordinary Kekkei Genkai could destroy an entire world?
It was unimaginable, and therefore unpredictable.
Night.
The souls of the Sages of the Six Paths have left the Pure Lands.
Konoha, Uchiha clan quarter.
The clan's business has been excellent lately. After the events related to the parallel world, all paths were open to Uchiha in Konoha. In the whole village, and indeed in the whole world, no one dared to touch them.
Everyone was afraid that a new Uchiha Yue would awaken among them.
The Uchiha themselves had no idea that their eyes held such power. Madara Uchiha and his brother also awakened the Mangekyo Sharingan, and how did it end?
One fell by the hand of Tobirama Senju, the other by the hand of Hashirama Senju.
Both died.
This proved that the Mangekyo Sharingan, although strong, could not possibly have the power to destroy the world. Alas, such were the ideas before the appearance of Uchiha Yue.
"Here it is, the Uchiha clan,— said one of the Sages. — Let's put an end to this sinful blood!
Under the light of the moon, two ghostly figures looked at the Uchiha quarter. In the next instant, the souls of both Sages entered the clan's territory, slipping into the houses of its inhabitants.
In one of the rooms, the Sage looked at a sleeping member of the clan. He easily raised his hand, touched his body, and the chakra of the Six Paths began to move, soundlessly depriving this man of the ability to procreate. When he finished, the Sage went to the next house.
They did not come to the Uchiha clan to exterminate it. The last one who tried to do this destroyed the whole world. Although the Sage was confident that he could kill the entire clan in the blink of an eye, he did not dare to take the risk. The consequences could be unpredictable, and there would be no one to answer for them.
Their goal was extinction. They came to deprive the Uchiha clan of a future generation. With the power of the Six Paths, they imperceptibly robbed the clan members of their ability to reproduce. Externally, neither men nor women felt any changes.
But in fact, they could no longer have children. The Uchiha clan was destined to exist for only one generation. The next one will never appear.
The technique of chakra castration!
The sin committed a thousand years ago has been redeemed today. If the Sage of the Six Paths could return to the past, he would not hesitate to castrate Indra so that he could not pass on this sinful Kekkei Genkai Sharingan to his descendants.
— Did it work?
— No problem. From now on, none of them, old or young, will be able to have children. I hope there will never be a Sharingan in this world again!
— Yes, I hope there will never be a Sharingan in this world again!
The souls of the two Sages of the Six Paths exchanged solemn phrases. They never imagined that one day they would violate their own principles and, being dead, interfere in the affairs of the world of the living. Yes, and in order to emasculate an entire clan.
Perhaps the Sage of the Six Paths should henceforth be called the Sage of the Six Castrations.
Soon after, the souls of the two Sages returned to the Pure Lands. They will be…