After three days of constant practice with Wood Clones on Ninjutsu, Uchiha Yoichi has mastered most of the Wood Release Ninjutsu.
Except for True Thousand Hands and Top Transformed Buddha, he has learned all other Wood Release techniques, even the Gate of the Great God.
Next time he encounters a Jinchuriki on the battlefield, just using a single Wood Release technique will be enough to bring them down.
Though a Perfect Jinchuriki can break free from Sharingan Genjutsu, they cannot counter Wood Release; if they transform into a complete Tailed Beast form on the battlefield, Uchiha Yoichi can use Wood Dragon Jutsu and Woodman Jutsu to deal with the Tailed Beast.
The chakra absorption methods of Wood Release are too restrictive for the Tailed Beasts.
Even if they don't use a complete Tailed Beast Transformation, even a Half-Tailed Beast Transformation poses no threat to Uchiha Yoichi; he is a master of Taijutsu, and under the insight of the Mangekyo Sharingan, the power of a Half-Tailed Beast Transformation poses no threat to him.
As for the body of Uchiha Yoichi, on the first day he almost used Sage Mode without much of Ichikishimahime's guidance.
Previously, the chakra within him was almost like Sage Art Chakra.
This inexplicably disappointed Ichikishimahime, as Uchiha Yoichi was the most delicious food she had seen in centuries, but unfortunately, she had no chance to taste him.
In the following three days, Uchiha Yoichi practiced Sage Art: White Rage Jutsu and Inorganic Reincarnation, one for battlefield control and the other for lethal force, both extremely powerful Immortal Techniques.
These two Immortal Techniques are very difficult to learn, and Ichikishimahime didn't teach them very diligently; she hadn't taught anyone Immortal Techniques for hundreds of years. In the end, Uchiha Yoichi mostly learned by watching her with Sharingan and following along.
After watching Ichikishimahime cast these Immortal Techniques a dozen times, Uchiha Yoichi gradually learned them.
"Sage Art: White Rage Jutsu!"
A red Chakra Dragon was expelled by Uchiha Yoichi, holding a black orb in its claws. After flying far out, the Chakra Dragon swiftly entered the black orb, which then emitted intense light and sound.
This strong sound, akin to ultrasound, couldn't be withstood without Sage Mode protection; even with Sage Mode, Uchiha Yoichi's eyes had to avoid this strong light.
"I told you, you need to accept the modifications from Ryuchi Cave; human Sage Mode is inadequate. It poses no problem when using your human Ninjutsu, but without the snake eye cornea to shield you, even you will be dazzled by the White Rage Jutsu."
Ichikishimahime floated beside Uchiha Yoichi and said, noting that while the Perfect Sage Mode of the other two Holy Lands just shows patterns upon the face, the Sage Mode from Ryuchi Cave is different; their Sage Mode bestows snake characteristics.
"Without the snake eye cornea, the White Rage Jutsu holds no meaning for you, so it's up to your decision, it's merely an appearance....."
"I'll think about it...."
Uchiha Yoichi glanced at Ichikishimahime and suddenly asked, "What kind of snake is your true form?"
"I have no true form, this is my true form!"
Ichikishimahime said, hands on her hips, her face transforming to reveal snake characteristics, quickly reverting back to a young girl's visage, continuing to say
"Now, besides the White Snake Sage, the three of us have already shed our serpent bodies, perhaps in a few centuries even these features on our faces will be gone."
"What kind of Ninjutsu is it? That allows a snake to take on a human form?"
"Don't be so naive, kid. When Ryuchi Cave existed, Ninjutsu hadn't even been invented in this world yet!"
Ichikishimahime affected a mature demeanor, though her age indeed makes her a senior's senior, her youthful face always left Uchiha Yoichi feeling something off.
"The Three Great Holy Lands each inherited a unique ability, ours at Ryuchi Cave was transformation; we three lack the perseverance of the White Snake Sage, so we just chose to become human, becoming dragons... who knows how many centuries that would take."
Ichikishimahime shook her head, making Uchiha Yoichi recall that before Otsutsuki Kaguya, the Ninja World also possessed extraordinary powers, and the Six Paths Sage's Immortal Techniques were supposedly taught by Mount Myoboku.
He suddenly became interested in the supernatural powers from millennia ago, but Uchiha Yoichi knew it would be hard to find; possibly only the Three Great Holy Lands' Sages know, but they certainly wouldn't tell him.
Ichikishimahime herself is only over six hundred years old, she hadn't been born a millennium ago.
"So, have you made your choice? Without modifying the Sage Mode, that Immortal Technique has nothing to do with you."
Uchiha Yoichi, upon hearing this, glanced at the Strategy Guide once more, the Favorability hadn't changed, remaining over sixty.
No malice, it might be worth a try.
"Then let's try it..."
Just as Uchiha Yoichi spoke, Ichikishimahime lunged at him, entering his embrace; the sudden lunge of the loli snake instinctively startled him, but he quickly controlled his motions.
However, as he was seated, even with her in his lap, Ichikishimahime was bent over, showcasing her juvenile form's grace, notably the uplifted youthful petals, like two perfect flower buds.
Ichikishimahime revealed her snake fangs, and bit into his neck.
Uchiha Yoichi immediately perceived another flow of Chakra merging from where he was bitten.
After the bite, Ichikishimahime told him, "Enter Sage Mode."
Upon hearing this, Uchiha Yoichi began refining Sage Art Chakra, and while entering Sage Mode, he noticed a slight change in himself.
His skin grew whiter, an end horn emerged on his head, and his control over Sage Art Chakra unexpectedly became smoother, allowing him to externally form Sage Art Chakra into various serpentine shapes.
"How is it, if you were hesitant back then, you wouldn't have gained these benefits, not only losing White Rage Jutsu, but missing out on these advantages~"
"Is this what you refer to as the transformation legacy of Ryuchi Cave?"
Uchiha Yoichi controlled the Sage Art Chakra and immediately formed a hand seal, casting Inorganic Reincarnation.
The solid ground instantly softened into a swamp, then tens of earth-formed giant pythons leapt out from it, like carp leaping from water, before returning to the swamp.
Upon finishing Inorganic Reincarnation, the emerged pythons turned into lifelike stone statues, their scales clearly visible.
Previously he had never perceived Inorganic Reincarnation as this easy; now Uchiha Yoichi felt he could use it to restrain Tailed Beasts.
Ichikishimahime, feeling proud, placed her hands on her hips and asked, "How is it?"
"Very impressive, I'll send you a few someday..."
"I don't eat those human kinds, but if you've trained in Sage Mode...."
"Well, forget about it. Not eating doesn't starve you, anyway."
Uchiha Yoichi interrupted with a backhand, fairness in breaking each other's words once; the gesture being merely polite, not intending to truly send something.
"You...!"
Enraged, Ichikishimahime lunged forward, attempting to bite him several times.
However, Uchiha Yoichi was still in Sage Mode, his perception and Immortal Techniques now significantly stronger, he instantly detected Ichikishimahime's movements.
Using Inorganic Reincarnation, he manipulated the ground, extending stone chains to bind the approaching Ichikishimahime.
"You just taught me Immortal Techniques; now I'll teach you some lessons, never trust humans..."
Uchiha Yoichi sensed Ichikishimahime attempting to break free, so he slapped his teaching hand several times on the delicate petals of the loli snake's waist, visible rippling waves rebounding.
Then Uchiha Yoichi commanded to Shinga, "Shinga, release the Reverse Summoning Jutsu."
Following the command, Shinga dissolved the Reverse Summoning Jutsu, sending Uchiha Yoichi back to Konoha Village.
At this moment, Ichikishimahime freed herself from the stone chains, and seeing Uchiha Yoichi had returned to Konoha, she angrily shouted at Shinga, "Are you stupid or something, just send him back when he tells you!"
"This esteemed being listens to the master, why say more, beware that this great being might eat you!"
Unperturbed, Shinga didn't pay her any mind and crawled back into his snake cave.