This is a good question!
Black Zetsu also wanted to ask this question!
Who left behind the bark of the Senju clan, who altered the content on it, and why is the record on the bark so absurd!
Black Zetsu actually knows the answer.
The Sage of Six Paths, Hagoromo Ōtsutsuki, indeed was not a good son, nor was he a good father. However, no matter how unfilial that rebel was, he would not have left such ridiculous historical records on the Senju clan's bark!
Honestly.
Black Zetsu would really like to admit that the history recorded on the Senju clan's bark is the same as that on the Uchiha clan's stone tablet. This way, it would save him a lot of effort.
But...
Why does Akihara Kagura seem completely unaware of these things?
Black Zetsu is filled with uncertainty. Is there really no one behind this little guy, or does he truly know nothing, merely having stumbled upon a piece of bark?
"Correct."
After thinking for a while, Black Zetsu decided to first try to deceive Akihara Kagura into trusting him: "The history recorded on the Senju clan's bark is indeed identical to the original history recorded on the Uchiha clan's stone tablet. Both have been altered by the Sage of Six Paths..."
"The Sage of Six Paths, realizing my existence and not wanting to be discovered as Kaguya's will, used the means of confusing history to rewrite my identity, claiming that I was his split dark will, making it impossible for me to ever gain the trust of the ninja world..."
To make the Senju clan's bark, the Hyūga clan's wooden tags, and the Uchiha clan's stone tablet align with the history he narrated, Black Zetsu had no choice but to admit this.
It was a lie and a test.
However, as Black Zetsu used these deceitful words to test Akihara Kagura, he suddenly felt that what he said made perfect sense!
Because of the existence of the Senju clan's bark...
Really could confuse history and his own identity!
That piece of Senju clan's bark was deliberately aimed at him. That false and absurd history made him the dark will of the Sage of Six Paths, ensuring that no one in the ninja world would trust him but would also keep a close watch on him as the Sage of Six Paths' dark will!
The records on the bark...
Indeed could make the ninja world vigilant about the resurrection of the Ten-Tails!
Because the records on the bark constantly reminded that the Sage of Six Paths' dark will intended to use the Ten-Tails to rule the ninja world, it would certainly alert anyone who read it!
That piece of bark...
Indeed could completely erase the reality of Kaguya's resurrection!
Black Zetsu suddenly remembered the Sage of Six Paths, that guy whose power was indeed formidable, who indeed possessed considerable wisdom, and who would not be constrained by his personality.
The Sage of Six Paths...
Would only do what he believed was right!
He would not care about ruining his reputation for any reason!
The existence of the Uchiha clan's stone tablet and the Senju clan's bark could indeed perfectly achieve the intentions of the Sage of Six Paths!
They were the common ancestors of the Uchiha and Senju clans, and being unscrupulous in achieving their goals was an inherent trait of ninjas!
Wait...
There is another issue...
The timing doesn't match up...
I altered the stone tablet after the Sage of Six Paths died; even if he noticed my existence during his lifetime, he couldn't have predicted I would alter the stone tablet, right?
Or...
Could the possibility of me altering the stone tablet also be part of the Sage of Six Paths' plan?
Just as Black Zetsu was filled with suspicion and almost deceiving himself, Akihara Kagura's words gave Black Zetsu a direction and even earned his trust.
"Black Zetsu."
"The content on the bark was fabricated by me."
Akihara Kagura's words almost made Black Zetsu's brain shut down, but without caring about Black Zetsu's reaction, he continued: "The history on the bark was indeed altered by me. The story it tells is about the Sage of Six Paths sealing Kaguya..."
"..."
Black Zetsu's body started to tremble.
He was almost deceived by his own lies!
But then Akihara Kagura, this bastard, told him that he had been deceiving him, too, and that this bastard had also altered the history left by the Sage of Six Paths, while Black Zetsu was busy wondering if someone was behind this bastard!
"I saw the original content on the bark..."
Akihara Kagura glanced at Black Zetsu and calmly said, "It recorded the ancient stories. The Sage of Six Paths indeed noticed you, left by Kaguya, and knew that you had once deceived his son Indra. That piece of bark was his countermeasure..."
After saying this, Akihara Kagura picked up the fishing rod by the lake and casually continued, "But I noticed your existence, so I deliberately altered the story, wanting to completely separate you and Uchiha Madara, making you abandoned by the whole world..."
"Why..."
Black Zetsu's inner world was on the verge of collapse.
This bastard...
How dare he say such things!
My millennia-long plan has been ruined, and the Uchiha Madara I managed to deceive has turned against me. This is all part of that bastard's scheme!
Damn it...
Why is there a bastard like Akihara Kagura in the ninja world?
If Kaguya Otsutsuki had not given birth to the Sage of Six Paths, the ninja world would not have produced a bastard like Akihara Kagura. Why does the ninja world have such a person...
Human schemes are too deep...
Black Zetsu felt that, despite living for a thousand years and witnessing countless plots, nothing compared to the insidious and despicable nature of Akihara Kagura!
I had tied up all my lies...
I even finished weaving the entire story...
I even convinced myself that the conspiracy belonged to the Sage of Six Paths, that it was all his scheme, and now this bastard tells me that it was all fake!
Is this even human?
Can a human do such a thing?
Even if my mother, Kaguya Otsutsuki, was evil, she was far less despicable and insidious than Akihara Kagura. This bastard's deceitfulness is enough to break one's mind!
"Why..."
Black Zetsu felt immense pain, even more than when it was wrongfully accused of being the dark will of the Sage of Six Paths in Konoha.
"The reason..."
Akihara Kagura glanced at the fishing rod, lowered his head, and said, "When we resurrect the Ten-Tails, I will tell you the real secret hidden on the bark!"
"I dare not say it now, as the one who left the mark on the bark is always watching the ninja world. Unfortunately, he cannot appear at the moment and can only descend in another form. The Ōtsutsuki clan is truly miraculous, almost immortal..."
"Perhaps he is already watching us here. That person is closely related to the Kaguya you mentioned, and only Kaguya can deal with him."
This was the final test before Kaguya's resurrection.
The Sage of Six Paths' chakra still exists.
Maybe because the Sage of Six Paths is Kaguya's son, or maybe because he was once the Ten-Tails' jinchuriki, gathering all the chakra of the ninja world...
Even after his death...
His chakra still lingers at the boundary between the ninja world and the Pure Land.
Akihara Kagura wanted to test whether the Sage of Six Paths' chakra could descend into this world. If it could, he could immediately defect and let the Sage of Six Paths become his superior, helping to seal Black Zetsu...
Of course.
If the Sage of Six Paths' chakra could still take action, he might have to use his Mangekyō Sharingan to escape into the Tsukuyomi world...
However...
The most likely scenario is...
The Sage of Six Paths' chakra probably won't appear.
Because Kaguya's name has appeared countless times during this period, but the Sage of Six Paths has never appeared, not even during the thousand-year wars of the ninja world...
The Sage of Six Paths' chakra might need to sense a specific presence as an anchor to descend, or perhaps there isn't much chakra left, needing to be saved for the most dangerous moment in the ninja world, allowing his children to possess the power to seal Kaguya...
Akihara Kagura was not too anxious...
But Black Zetsu was extremely nervous!
"!!!"
Black Zetsu's eyes widened in shock!
At this moment...
Black Zetsu's mind was about to explode!
At this moment...
Countless possibilities flashed through Black Zetsu's mind!
Black Zetsu stared intently at Akihara Kagura, desperate to get the answer from him: "Do you mean... the enemy from beyond the sky... has come? Or that person..."
Is it the enemy from beyond the heavens...
Or has the Sage of Six Paths not died at all?
"Exactly as you guessed."
Akihara Kagura put away the fishing rod, catching a fish, and said solemnly, "If I wanted to destroy the ninja world and recreate it, that person might appear to stop me. Even if I became the Ten-Tails' jinchuriki, I might not be able to defeat him..."
"That's why I wanted to know the truth from you..."
"Only the legendary Rabbit Goddess..."
Akihara Kagura naturally revealed the truth: "Only she has the power to contend with him, allowing me to smoothly complete my plans of world destruction and recreation."
"..."
Black Zetsu's body trembled violently, realizing what was originally recorded on the Senju clan's bark!
It recorded...
The secret that the Sage of Six Paths still existed in some form...
Black Zetsu's body was about to explode, fear spreading through its brain, making it afraid to utter Kaguya's name again!
"He... will stop us... from resurrecting... her?"
"Impossible to stop…"
Akihara Kagura extended the fishing rod in his hand, a sharp glint in his eyes: "But once someone is resurrected, the records on the tree bark indicate that he also has a way to seal people up again..."
"What... should we do?"
Black Zetsu immediately became flustered and panicked: "What should we do? What can we do..."
"Don't worry."
Akihara Kagura comforted Black Zetsu and proactively spoke: "If the Ten-Tails are not resurrected, I guess he won't appear... We can resurrect the Ten-Tails first, then gather the chakra of the ninja world. The rest is beyond our involvement."
"Alright... alright... alright..."
Black Zetsu forcibly stabilized his emotions.
Bastard...
How could I possibly stabilize!
Calm down...
This bastard might be deceiving me!
This is the critical moment, I mustn't panic. The plan is nearing its final stage!
Although Uchiha Madara is no longer a pawn, Akihara Kagura will clearly become my new pawn. At this moment, I mustn't lose my composure. I need Akihara Kagura to believe that Kaguya can destroy the Sage of Six Paths in another form...
"As long as Mother is resurrected..."
Black Zetsu's body trembled, trying hard to calm itself: "As long as Mother is resurrected, everything will be fine... everything will be resolved... Mother is the strongest in this ninja world... No one can surpass her!"
This is a lie!
What Akihara Kagura said is a lie!
The Sage of Six Paths can't be alive!
The Sage of Six Paths has long been dead, I saw him die with my own eyes!
But...
This time, I can't deceive myself...
Because Akihara Kagura mentioned this possibility, and it was recorded on the tree bark. Black Zetsu didn't believe Akihara Kagura would lie...
Because...
The Ōtsutsuki clan is truly mysterious...
The Sage of Six Paths might indeed exist in another form...
After all, even without the Ten-Tails, Kaguya Ōtsutsuki could exist in another form, and her will still looms over the ninja world...
This only proves that Mother is invincible!
No one in this world can stop Mother's resurrection. Even if the Sage of Six Paths exists, he can't defeat Mother. As long as Mother can be resurrected, everything will be fine!
Now Black Zetsu is only worried about one thing: will the Sage of Six Paths in another form stop them before Kaguya Ōtsutsuki is resurrected...
"So..."
"Black Zetsu..."
"Since Kaguya is invincible..."
Akihara Kagura looked at Black Zetsu and continued proactively: "If I choose to join you, to join Lady Kaguya, will she allow me to destroy the world and create a new one?"
"Of... of course."
Black Zetsu tried to relax, showing an awkward smile. It no longer dared to mention Kaguya's name: "Mother and I will definitely support you... Don't mention Mother's name at this time..."
[System Prompt]: [You have a new superior (Black Zetsu), reward for new employee package, new feature unlocked!]
[Mental Fusion (Allows you to merge with the enemy's body using Yin-Yang Release, controlling their body and actions.)]
This ability is insignificant to Akihara Kagura...
But...
I've finally connected with Kaguya.
Unfortunately...
Even now, the residual chakra of the Sage of Six Paths Hagoromo Otsutsuki hasn't appeared. Perhaps his chakra is truly depleted, as he distributed much of it in history...
Perhaps...
He will only appear at the most critical moment...
Akihara Kagura himself can't conveniently meet him, as the Sage of Six Paths hides in the gap between life and death, only visible at the edge of life and death...
"That person left records on the tree bark, monitoring everything in the ninja world, yet he hasn't appeared. He must still be arrogant..."
Akihara Kagura reeled in his fishing rod, casually taking the fish off the hook, and casually threatened Black Zetsu: "Maybe he thinks he can solve the resurrected again..."
"Kagura!"
Black Zetsu hurriedly stopped Akihara Kagura, hoping its plan could proceed as expected: "Before Mother is resurrected, don't mention her name again!"
~~~
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— Ending + Extra Chapters!
Read upto Chapter 348: End! + Extra Chapters of Sasuke's Rebirth where the world Akihara Kagura is not around. Thank you!