Boruto (Momoshiki manifested) used a Rasengan to kill Hiruzen Sarutobi. He had absorbed it earlier using Kōryūō no Mikoto while Naruto was teaching Konohamaru the Rasengan.
Kōryūō no Mikoto, Momoshiki Ōtsutsuki's Rinnegan ability, allows him to absorb Ninjutsu and then release it with amplified power.
Absorbing a regular Rasengan allows him to release it with the power of a Super Big Ball Rasengan.
However, to minimize disturbance, Momoshiki chose to compress the Rasengan.
It remained the size of a normal Rasengan, but its power was terrifying.
It pierced through Hiruzen Sarutobi's body like a meat grinder.
After dealing with Hiruzen Sarutobi, Momoshiki originally planned to enlarge the Rasengan to destroy the body.
His keen awareness of space-time suddenly made Momoshiki realize that he couldn't do that.
It seemed that preserving Hiruzen Sarutobi's body would have a crucial role in the future, marking an important node.
"Hmph."
Momoshiki snorted, transforming the almost dissipating Rasengan into a thrust, pushing Hiruzen Sarutobi's body towards the forest.
Half an hour later.
Naruto and Konohamaru returned from slacking off and were puzzled to see only Boruto.
"Hey, where's my grandpa?" Konohamaru asked, hands on his hips.
"He said he had other things to do and left a while ago."
Boruto felt very guilty about deceiving his older brother Konohamaru and didn't dare to look into Konohamaru's eyes when he spoke.
However, the two children in front of him were carefree and didn't notice Boruto's abnormality at all.
"Busy? Didn't Third Hokage Grandpa retire?" Naruto asked, puzzled.
"Don't you know, Big Brother Naruto? With the Fifth Generation newly in office, my grandpa is still helping to handle many things," Konohamaru explained.
"Oh, I see..."
"..."
Boruto breathed a sigh of relief, seeing that he had managed to fool them.
At the same time, he desperately hoped that his master Sasuke would return soon; he truly didn't know what to do by himself now.
—
Land of Wind Desert.
After Bai Mo finished telling the story to Temari, she understood Bai Mo's intention.
As she was debating who should undertake this task, they passed a Village and happened to see Gaara dealing with several invading bandits at the Village entrance.
Sand Coffin directly enveloped the several individuals in sand, crushing them into dust.
Despite using cruel methods, Gaara became very gentle when he turned to comfort the villagers.
However, this gentleness from Gaara seemed a bit awkward, as if he was trying his best to recall and learn the personality of his uncle Yashamaru from his memories.
"Now I understand why he could become Kazekage; this is indirectly achieving both benevolence and might," Bai Mo said, watching Gaara's actions, and couldn't help but smile.
The original Gaara's image was solely one of might, with others only feeling fear towards him.
The Gaara influenced by Naruto had undergone a change in personality.
This change would create a huge sense of contrast for those who already had a fear of Gaara.
However, even though the current Gaara is still awkwardly learning, by the time of the Great Ninja War, he will have become very mature and capable of leading the Allied Shinobi Forces.
Comparing them, it feels like Naruto, even in his thirties, isn't as mature as Gaara at fifteen.
"Sister?"
After he finished, Gaara turned to leave the Village but saw Temari and Bai Mo.
"Let's go, let's head back together," Temari invited.
"Wait a moment, if you're not in a hurry, come with me to two places first," Bai Mo said, unfolding a map and looking at it.
"We're not in a hurry; the last batch was dealt with today."
Thanks to Gaara's unremitting efforts these past few days, the unrest in the Land of Wind caused by the Fourth Kazekage's death was almost quelled.
Gaara, relying on his "talent" of being unable to sleep, had been constantly on the move these past few days, dealing with bandits and robbers everywhere, and his methods, which others found extremely cruel, established new authority.
The three embarked on their journey.
On their way to the destination, Bai Mo told them the target of the first location.
"Unsealing a powerful member of the Uchiha Clan from the Sengoku period?" Temari was puzzled after hearing this. "Powerful? How powerful?"
"So powerful that Uchiha Madara would be silent if he knew, and Uchiha Itachi would cry if he knew."
"Huh?"
"Just kidding, but purely in terms of the Sharingan, her eyes are indeed more powerful than those two."
—Well, Madara's Rinnegan doesn't count.
Bai Mo could only say that the Mangekyō Sharingan was like gacha and version updates.
Madara's Mangekyō ability is unknown, and it's not mentioned in the official databooks at all, so it can only be inferred as an enhancement Ninjutsu.
Itachi's were Amaterasu and Tsukuyomi.
The future Sasuke, after awakening his Mangekyō, only had Kagutsuchi and Amaterasu.
So, what abilities did our Uchiha ancestor from the Sengoku period, Uchiha Hikari, possess?
Yachihoko.
Known as the Little Divine Tree.
Not only could she absorb others' Chakra, but she could also inject Chakra back into others, with an amplification and enhancement effect.
It was a self-sacrificing, low-tier version of Kōryūō no Mikoto.
Madara's Mangekyō ability of "strengthening Ninjutsu," which might not even exist, was already instantly surpassed.
If Black Zetsu hadn't focused all his attention on the reincarnations of Asura and Indra, and instead paid attention to Uchiha Hikari's physical and mental health, Kaguya might have been unsealed during the Sengoku period.
In addition, Uchiha Hikari's eyes also had the Tsukuyomi and Amaterasu visual Ninjutsu implanted by the Uchiha Clan using [extremely cruel, painful, inhumane, and now lost] methods.
And due to the amplification effect, Tsukuyomi could evolve into Engraved Tsukuyomi, projected onto the moon, seemingly an Infinite Tsukuyomi, but capable of achieving a control effect similar to Kotoamatsukami, able to control even someone of Naruto's level.
Amaterasu was slightly less impressive, only able to be amplified into Kagutsuchi.
Just listing these abilities makes Uchiha Hikari's Sharingan seem incredibly sinister.
—Why not just fuse Kamui into it as well?
Oh, perhaps because she awakened her eyes at too young an age, and hadn't experienced romantic love, so she couldn't use Yachihoko Nanazou no Namida.
Then never mind.
Soon, Bai Mo and his group arrived at their destination.
The location where Uchiha Hikari was sealed was on the border of the Land of Rivers.
That is, the small country sandwiched between the Land of Wind and the Land of Fire.
Being so far away, it's no wonder no one ever discovered it.
Following the scroll given by Hiruzen Sarutobi, Bai Mo found the location.
"Wait a moment."
Bai Mo hadn't even made a move when Temari suddenly spoke up, stopping him.
"What's wrong?" Bai Mo looked over, only to see Temari with a conflicted expression.
"Have you thought about whether that person will listen to you after being unsealed? What if that person attacks us directly after coming out?"
Temari's thoughts were very comprehensive.
"I've thought about that, and I do have a way to solve this problem, it's just..." Bai Mo sighed as he said this.
"Just what?" Temari asked curiously.
"It's a bit hard to say, I can't bring myself to do such a thing."
"..."
Upon hearing this, Temari's expression became somewhat strange.
As if to say—there's something you can't bring yourself to say, something you're too embarrassed to do?
....
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