As it turns out, Kai could save him some trouble by forming a clone through Senjutsu by forming a clone of half his chakra and then letting it enter Sage Transformation. It wasn't a solution but that's all Kai had if he wanted to save juicy research of a whole new jutsu later.
As such, Kai focused on forming a Genjutsu that had the same effect as one of his skills that allowed him to control his mind.
And the clone focused on forming the Yamanaka Clan's hiden that imbued the metaphysical concepts of consciousness... something Kai had a slight experience in through the seals that formed a spirit body but...
Kai gained different results for that, something he needed to grin ONLY after the clone continued to dance in the lower laboratory until all the chakra was expended.
As for why Kai couldn't just use a regular genjutsu to control Danzo and see through his memories... well, it wasn't efficient. To do that meant conversing with Danzo in his 'mind.' What Kai and Tsunade wanted was to SKIP this step so that they could directly pull out the raw information.
And... Kai did just that once he got an extrapolated skill that shared similarities with Yamanaka Clan's Hiden since each Hiden technique is not written but passed down verbally.
The OTHER skill he got from trying to illegally get 'patented' info, however, interested Kai more.
---
"That's everything?" Tsunade took a deep breath once she closed a THICK file filled with notes and stacks of paper. With Kai not 'allowed' to leave the confine of their labs under Tsunade's manor, they sat in the living room/personal office of her laboratory since Kai's lab was saturated with a unique scent that made every biological creature with the ability to procreate attracted to him. So, in essence, not wanting her panties flooded, Tsunade refused to enter his lab.
Kai's words, not hers.
He nodded while in his base form in a rare moment of recovering chakra, "I noted every kill he made. Every friend he made. Every... interaction he had with Hokage... damn, I didn't know that every Hokage except Tobirama Senju had such inclinations... ehm," seeing Tsunade's expression darken as Kai pulled Hashirama into the fold of 'suspicion', he cleared his throat and added, "Anyway, we know it for a fact that Hokage will shower Danzo with leniency should we find and provide all these evidence. Maybe, Danzo will be given a quick death but... that's not what you want, right?"
Heaving once again, Tsunade somberly stated everything that truly made her despise Danzo even after the cripple she'd turned him into.
"He was the one who leaked confidential information about Uzumaki Clan a decade before the Second War to let the three villages scheme against Uzu and cause this Second Nightmare... and then, in that decade, he systematically eradicated the backbone of my clan... my father... my mother... he's the one that almost caused the extinction of Uzu... the benefit of the village, my ass! Just how can someone grow so BITTER and paranoid!"
She gritted her teeth as Kai didn't know how to answer that question either. Danzo... simply woke up one day and decided to be this cancer. In fact, his life was pretty awesome but the dude cause the death of his own son by releasing the news that Mito was dead, and... well, the One-tailed Jinchuriki went bonkers and killed off the front commanded by the Shimura descendent.
But... Tsunade felt all that anger vanish.
She had her answer. She had already vented her frustrations largely. Of course, she didn't mention the kinds of things Danzo had planned for her as the most popular prospect of inheriting the best of Hashirama. Everything that Danzo claimed for the good of the village... was done for HIM to rule the village and maybe, eventually, overthrow his throat buddy— Hiruzen.
"I don't understand two things... how did he get my grandfather's cells... And what about the Uchiha eye? If he did kill Kagami Uchiha back then, what about the second eye and why did he lose his vision?" Tsunade looked at Kai.
Danzo's 'report' only included his actions. She was aware that Kai left out a grand region of information.
As a prominent elder and an apprentice to the Second Hokage... Danzo had a lot of information on various Jutsus. Given the fact that he controlled Root that deployed members of various clans... it could be argued that Danzo may be the one that KNEW the most jutsus after Tobirama... and now Kai.
Grinning viciously, Kai's excited gaze transitioned from black to yellowish, "The cells just showed in the Root one day mysteriously, truly... as for the rest, Sensei... can't be the best guardian if I don't 'save' you from these moral troubles, right?"
Snorting and feeling visibly better since she had long mourned the passing of her parents, Tsunade narrowed her eyes, "Cheeky punk, you really think I won't administer grandfather's cells, or use them to enhance my own while letting Orochi do the same to me as she did to you?"
Not expecting such willingness, and being able to sense her confidence, Kai blinked in surprise as Tsunade noted it and added, "Oh, please. Everything change. Even morals. I cried at my first kill but now I don't mind being the butcher. So? Still up for 'motivating' me enough so that I ditch your help and go to my 'dear' friend?"
Giving her a deadpan, Kai snorted, "Sure, go ahead. Maybe your Sage Transformation will turn your skin into the bark of trees and grow shoots of leaves from your tits!"
Tsunade growled and threw the file at his face which he caught it promptly as she gave a cold huff, "Now I CANNOT get that image out of my mind. Thank you for that!"
"Of course," Kai smiled sincerely.
However, Tsunade's brows were still locked, "Jokes aside, Orochimaru trusts our... or rather, your abilities enough to know that you would have eventually 'unlocked' Danzo. She will realize what a source of information Danzo can be... so, what do you propose we do with her?"
Kai hummed thoughtfully. He didn't put it past the snake to bite them in their backs so he sighed, "Fine... I'll do it... I'll use my Sage Arts, give her the night she will NOT forget, and acquire her loyalty. But, remember, you're the one who tasked me with this."
Almost too stunned to speak, Tsunade's eyes widened before she guffawed, "Orochi will chew you out, boy~! Have you seen that tongue? Hmm, anyway, do you think we should try... and employ her?"
Groaning at the lack of 'trust' in his imaginable prowess, Kai pouted and leaned back, "Employ her where?"
"You are performing research on Sharingan and we are collectively researching Rinnegan but even after years... we found nothing. Makes me want to plug the damn thing inside my sockets..." Tsunade huffed, "How about... we add Orochi."
"No need," Kai frowned, "Danzo... gained a rather substantial source of knowledge once he had your family members killed and your storage facilities breached. He couldn't hope to get away after trying to poach the legacy skills so... he opted to take away Second Hokage's research materials that he, too, tried to emulate dojutsu through a jutsu..."
Tsunade frowned, "What do you mean?"
"Well... according to Danzo's memories... Tobirama Senju researched the Uchiha clan's members. He didn't go as crazy as Danzo to plot against the Uchiha Clan but... he may have looted the dead before their cremation. At the time, Shadow Clones weren't as popular and the Flying Thunder God Technique made it too simple to break in, commit the act, and leave... these research notes have some information about the Uchiha clan that supports my own theory on Dojutsu but, in the end, you need to be an Uchiha to have sharingan naturally." Kai explained as it roused Tsunade's interest who still had a hard time recovering from the fact that her Granduncle was essentially a grave robber.
---
Elemental Jutsus, actual Hiden of Yamanaka, Nara, Akimichi, and Aburame Clans, the so-called scroll of Forbidden Jutsus of Konoha and so much research material...
That alongside Kai's own need to master and synthesize everything with Senjutsu made it absolutely clear that despite his goals, Kai would have a long time mastering JUST whatever he could excavate from Konoha.
Including the secret jutsu of Yin Transformation that turns the soul into a 'ghost' that can possess others...
Freaky stuff...
Truly, the world just doesn't stop being interesting at all.
But, Kai was invested as ever. He had clones for grind and what he wanted to achieve before anything was the ability to naturally recover Senjutsu directly, an achievement possibly marked under the belt of Hashirama Senju alone.
Others would crumble at the thought, envy Hashirama's Kekkei Genkai and whatnot.
Nuts to that.
If he could form Piercing Vision that managed to emulate the effects of Byakugan briefly then he can surely find a way to recover Senjutsu Chakra.
And as for Piercing Vision...
Kai looked up towards the ceiling, the floor above where Tsunade worked before a lurid smirk stretched over his lips and he groaned, "Nice!"
"Nice~!"
"Naisu!"
"Mmmgh~!"
Other clones chimed while Kai dispelled the clone that couldn't keep it in his pants.
---
How many clones does it take to achieve the greatest level of grind?
Kai often wondered this question.
Did the second Hokage consider the implications of what would happen if such a skill got into Kai's hand?
Sure, Shadow Clones by themselves cannot recover chakra under ordinary circumstances... but ever since the 'load' of dispelling the clone grew minimal, Kai simply did not want to stop.
Again, how many clones does it take to ascend to a new level of grind?
10? 100?
To be honest, Kai had no way to figure it out. His score this month alone was forming and dispelling 1069 Clones and that, too, because Kai wanted to end the month on a good number.
His requirements, especially in Shikkotsu Rock Egg Sage Art were quite high. But he had mastered it eventually. But that wasn't all. The clones were not just here for the show. While a 'few' did master most of the skills including the forbidden ones that would make him a criminal wanted by all the villages, Kai successfully attempted to transition most of the jutsu into Senjutsu but until now, he was better at it when it came to techniques of yin and yang transformation which led him to believe while 20% affinity in the basic elements is fine to cut the number of hand seals... he needed to train in them more to try and transition all those techniques into Sags Arts without external assistance.
As such, his grind for the month concluded with a few skills that would surely allow Kai to reduce Orochi's smug smirk to nothingness... but Kai did not do it for showoff. He did it for fun.
Still, with Kai having emulated most of the hiden, it was easy to master the actual secret techniques of the famous Nara, Yamanaka, and Akimichi Clan, and honestly speaking, the honest-looking Akimichi actually boasted the most complicated skills... but Kai had experience in their skill through the Bojutsu of Shikkotsu Rock Egg Sage Art.
As such, despite their complication, the ability to manipulate the size and one's weight was not too out of this world for Kai.
[Shikkotsu Rock Egg Sage Art (75/75): Allows the user to master a set of Sage Arts and wielding of Senjutsu Chakra consciously to enter Sage Mode. Reduces the cost of Senjutsu Consumption by 0.67% at every level.
1) Drunken Monk-ey's Fist— This allows the user to perform a Taijutsu based on the intoxication of oneself using products brewed by nature energy and the manipulation of Senjutsu Chakra. Current Consumption: 2800 Senjutsu Chakra; 16 Stamina per minute.
2) Monkey Shifts, Staff Sticks— This allows the user to perform Bojutsu that utilizes a special staff able to transmit nature energy. Current Consumption: 2000 Senjutsu Chakra; 16 Stamina per minute.
3) Monkey Steals Bitches, Monkey Eat Peaches— A dance that manipulates nature energy to produce an environment of natural aphrodisia to charm sentient beings. Current Consumption: 3000 Senjutsu Chakra per minute.
Note: Special bodily conditions of the user redact the effects of the sage mode of added gain in raw parameters by 10 times.]
[Mystical Sage Palms (15/15): Allows the user to charge Senjutsu Chakra in a specific ratio of yin and yang nature to induce rapid physical improvement and a veritable boost to the immune system. Decrease consumption by 3.33% at every level. Current Consumption: 5500 Senjutsu Chakra/min.]
[Consciousness Controlling (30/30)]
[Mind Body Change (5/5)]
[Mind Body Derangement Technique (10/10)]
[Telepathic Link (3/3)]
[Spirit Transformation Technique (15/15): Allows the user to safely transform their soul into a spirit body that can travel independently of the physical body to perform various functions including possessing a weak-willed individual temporarily based on their will against the user, sharing chakra, and phasing through physical matter. Reduce Chakra Consumption by 3.33% at every level. Current Consumption: 1200/min.]
[Shadow Possession (2/2)]
[Shadow Stitch (1/1)]
[Calorie Control (50/50): This allows the user to freely control the matter of the body to expand the size of any body part and increased the raw parameters of the said part proportionate to the increase in size and density. Reduces the consumption of chakra by 1% at every level. Current Consumption: 720/sq inch.]
[Ultimate Calorie Control (10/10): This allows the user to freely manipulate the matter of the body to either decrease or increase the size of the body or its parts. Reduces the consumption of Chakra by 5% at every level. Current Consumption: 720/sq inch.]
Calorie Control is the basis of all of Akimichi Clan's hiden as they use Yang Nature transformation to achieve the intended desire. In return, Kai formed the Ultimate Calorie Control that allowed him to reduce the size of his body. This was simply inspired by the Shikkotsu Rock Egg Sage Art. However, while the two techniques indeed required a higher chakra amount... in his Sage Transformation that could already freely manipulate the structure of his body, the amount of Senjutsu Chakra required was simply too low to be registered.
But this wasn't all.
Kai managed to form a devastating list of Sage Arts based around Genjutsu. They were the same Genjutsu but merely augmented with Senjutsu which made it impossibly hard for a non-sage to recover from the technique— making Kai tie with Orochimaru as the deadliest shinobi and kunoichi of the village at the moment.
[Sage Illusion: Six Senses Destruction (5/5)]
This was the only skill that reached as high as level 5 because of the knowledge of augmenting genjutsu with Senjutsu Chakra. The rest... were an easy grind.
[Sage Illusion: Harlot's Night (2/2)]
[Sage Illusion: Joker's Nest (2/2)]
[Sage Illusion: Infinity Nightmare (2/2)]
[Sage Illusion: Void Ring (2/2)]
And these skills by themselves were Kai's greatest long-ranged attacks at the moment, at least, the Genjutsu that were not based on touch.
All this was a grind that a few hundred of his clones could have completed. Kai had used the rest to brainstorm the idea of recovering senjutsu chakra at any time and again, he couldn't outright solve the problem but he found a way to make the situation manageable.
***
Shoutout to Densys Bratini and Colin Chapman!!
Read 30 advance chapters here—
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Tsunade, admittedly, had a hard time keeping her eyes peeled off of the youth biologically more than 20 years younger given she had aged somewhat in the second war and the youth in front of her had also sped his growth by three years. But despite having hope to recover her youth and the years she lost through continuing her prisoner's search, the fact remained she would be too old to eye the 'youth' in front of him who was a shy away from flashing her entirely.
And what... actually attracted her wasn't the half-naked youth. It was the fact that the ordinarily hyper-excited and perverted youth silently set a seal in the center of her laboratory with an utterly calm expression. Tsunade has had her moments. It wasn't the fact that she didn't like perverts. Despite her 'inexperience', she didn't mind Jiraiya's stare or Dan's attraction back then. Who didn't want to feel wanted?
But her hands just moved when someone tried to be a bit forceful. And when her hands moved, others broke. Jiraiya, after his experience, didn't stop but he clearly 'knew' the dangers and turned tame.
And Dan... last Tsunade heard about him, he had already woken up from the mental shock but wasn't deployed to the force. Even with other medics healing him, he needed a long rehabilitation session to make a full recovery.
Kai, however... had grown on her for two reasons.
These past two months, Tsunade and Kai were practically living together aside from the nights when he returned home and...
Kai would find ways to constantly 'prove' that he wasn't supposed to be expected as anything but a man. The two months were definitely grueling since Tsunade became the only 'mark' in Kai's gaze and ever since he actually became a dragon, his urges practically skyrocketed. And that... earned him a beating. Well, it was either that or actually fighting back and laying ruin to both of their labs.
And when Tsunade's first punch, that Kai just decided to withstand as a form of training, was endured with barely any force through his 'new' body... her 'hell' began then.
Kai... had surpassed her, actually, in durability. She could increase the force of her punch but that did not change the fact that Kai had managed to earn the position of strength that actually allowed him to GUARD her. He was finally her Legacy Guardian and it made Tsunade quite complicated.
But this moment of silence forced her to recall everything that happened over the period of two months.
Kai adopting Sage Transformation, Orochimaru's affiliation, Danzo's captivity, and now this... the way Kai modified the seal was something Tsunade expected from her 'late' Grandmother. Despite her obvious strengths, Tsunade knew her Granny was a massive nerd when it came to seals. She may not have developed the Uzumaki Inheritance but she damn well built it up before passing it on. Her passing memory of her grandfather was actually claiming that Mito is what Tobirama became for the Senju Clan.
While most Uzumaki members are definitely nerds in their own ways, including Kushina who could accurately describe the components of a ramen's flavor, Mito was a little... extreme in her ways. After all, no 'tame' individual would volunteer to seal a devilish fox in her body.
And the youth in front of him was similar. So was Orochimaru.
The type of individuals who knew what they wanted and got it despite the massive political or moral barrier that may stand in their way. As if sensing her gaze, she saw him turn to look in her direction. His gaze was briefly drawn to her form and then her eyes... like usual. If this stare was 'cute' when Kai was actually young then now... she truly was forced out of her views to regard him as an apprentice and a young one at that.
Rolling her eyes at her own thoughts and the youth simultaneously while making sure to clear her head with wine... alone this time since alcohol was making her even more of a risk around him, she remarked with a biting, annoyed tone, "Stop gawking and do your work. I'm not just here to be your chakra battery!"
"But you are convinced that this is better than slowly saving away bits of chakra for years to come, right?" Kai smirked in response.
This is one thing he hadn't understood before.
Tsunade had taught her apprentices the Legacy Technique left by Mito in the Senju Clan— Strength of a Hundred Seals and all of them were talented enough to master it... eventually.
The thing is, that this sealing technique needed a ton load of chakra.
While Tsunade's current chakra capacity was about 260000, nobody knew the actual amount she had 'stored' in that mark of hers. Even if she denied the claim, Tsunade, for all intents and purposes was a chakra battery for whomever that could 'use' her. After all, the Strength of a Hundred Seals stored chakra constantly and supported a Jutsu without the user's conscious effort.
For Tsunade, it was her Body Transformation Jutsu. She could stay young for... well, until she exhausts her chakra.
Kai wanted something else...
Like his basic chakra storage seal, the Strength of a Hundred Seal was a product of Fuinjutsu and Yin Transformation. Unlike other jutsus... Fuinjutsu needed very LITTLE tuning up to be transitioned and usable with Senjutsu Chakra. So little that his trait did not consider a new bit of knowledge at all and thus, had no new skill about it.
But this only made the origin of Fuinjutsu even more mysterious as the seals worked almost too well with Senjutsu Chakra. Orochimaru also devised seals to perfectly transition the Kekkei Genkai of Sage Transformation onto Kai through Fuinjutsu. But Kai wasn't here to dig the mysteries of the world, he wanted to dig something far more crucial.
So, even if Tsunade wouldn't agree that Kai's method of using a 'battery' to form this seal and then run it later was a blatant skip of many steps that actually made Tsunade a beast in the chakra control department, Kai had made it clear that he could still gain the actual benefits of the skill, i.e., 100% chakra control or— 100% Reduction of Chakra Wastage.
If this was before, Tsunade would doubt the boy but since meeting him, her act of not believing the youth has always blown on her face, figuratively.
As such, when Kai sat down in the center of the sealing circle surrounded by inky black scribbles with a large painted spot in the center, Tsunade let out a heavy groan and walked forward before taking a seat not far from him on another painted spot.
It was clear that she did not like being 'passive' but this sensation was just so much more prominent this time given how Kai was intending to use her... still, she stared at the seals. She may not be a Fuin master like Kai or Kushina who was making steady gains in her mastery of seals but she had mastered the Strength of Hundred Seals and this made Tsunade inquire about the most obvious 'flaw' with a frown.
"Why... is the technique's final point of Yin Concentration not fully marked?"
"Because nature energy cannot improve something already considered complete," Kai grinned, "I had to introduce an imperfection to let the nature energy take its course~!"
Understanding the implications of his words, Tsunade's eyes widened, "What?! That almost sounds suic—"
"Awesome, I know," Kai shrugged as he slammed his palms together. Tsunade may have seen the most obvious flaw of the seal but she totally failed to see the minute changes he introduced to Mito's legacy. The remaining few hundred of his clones didn't just sit idle or leave things to luck. They buckled down and did the appropriate research for this seal, noting any possibility that they could and form a plan 'good enough' for Kai because he knew that whether he liked it or not, the contribution of luck despite its necessity is not something that can be controlled.
As such, without Tsunade could complain any further, the seal around them glowed and Tsunade felt her chakra drain and then get refined.
With his knowledge of chakra transfer, refining and absorbing a willing party's chakra was easy enough for Kai. The main point of this whole giant ass seal was to absorb Tsunade's chakra AND introduce nature energy to the mix that interacted with his own chakra signature.
It was almost instant that Kai's body bulked, his underwear stretched further against the confines of his flesh as his muscled, almost 'greyish' body grew even more well-defined while he closed his eyes and stabilized his breath as Tsunade, too, grew silent while she released her seal. The diamond-shaped mark on her forehead inverted and let out thin trails of purple lines over her face that curved around her cheeks while leaving a diamond-shaped space in the center and that's when Kai realized just how much chakra Tsunade had stored...
Millions...
Just too much!
The only thing Kai could compare Tsunade to was what he felt within Mito and Kushina. Make no doubt— Kai never managed to actually measure the beast within them. But, the concept of chakra capacity of such vast and inexhaustible size was... almost 'simple' to Kai for a second.
What use is so much chakra is not used efficiently?
While Genins, Chunins, and even Jonins scrambled over Chakra Capacity— the world of elites is only governed by skill. Tsunade just had the necessary SKILLS to master such a seal and in turn, save so much chakra over the years and not the other way around.
And, Now, Kai let the 'skill' which he expected to be new and thus, have a notification of extrapolation of data marked along...
But it never came.
This skill, this Seal that he wished to form already existed and in written form at that...
[Seal of Adamantine Sage (1/75): Forms a seal of chakra concentration capable of storing Senjutsu Chakra, too, in a special seal which becomes available for use after 5000000 chakra points and senjutsu chakra is stored. Reduces Chakra Wastage by 0.186% at every level. Reduces Senjutsu Chakra Wastage at every level by 0.66%.
Next Level: Store 800978/1000000 chakra/senjutsu chakra or 60 SP]
'Adamantine Sage?' Kai wondered. He knew Toad and the Snake Sage. He considered himself the Dragon Sage. There was a white snake kid but the brat was no sage yet... and he mused if this sage was even alive.
---
Far off, deep within the ocean under a sturdy structure of seals and earth while viewing the formation of a chakra construct entirely red with hints of magma forming around it, a masked, white-clothed maiden sniffed her nose and muttered, "Almost sneezed... is someone plotting against Uzu again? Well, not my problem. Saved them once, they should be one their toes now..." and with a scowl, she turned to view the giant 'phantom', "Damn... I heard that they revive but didn't know it took so long..."
---
Pulling his attention from the name and seeing that the skill had the desired effects, Kai sucked Tsunade wholly off of her chakra without inhibitions. She had a lot of juicy chakra stored in and Kai knew he could manage to grind the skill in one seating.
Of course, this wasn't something Tsunade wanted to experience but she felt that if she could 'satisfy' her guardian with just her chakra... then it would be worth it. Given the initial success of the seal, Tsunade also wished to note the difference between their Seals and if she should even consider... taking up on his offer to practice with him.
And soon, well, in a matter of days, Kai mastered the grind.
[Seal of Adamantine Sage (75/75): Forms a seal of chakra concentration capable of storing Senjutsu Chakra, too, in a special seal which becomes available for use after 5000000 chakra points and senjutsu chakra is stored. Reduces Chakra Wastage by 0.186% at every level. Reduces Senjutsu Chakra Wastage at every level by 0.66%.]
And the most recent addition to the status panel pleased Kai greatly as it opened yet ANOTHER path of improvement.
[Name: Kai
Age: 14
Title: Senju Legacy Guardian
Gamer Traits: Skill Tree; Sleepless Gamer
Rank: Jonin
Hit Points: 100%
Stamina: 100/100% (46.1/min)
Senjutsu/Chakra: 292425 (78800→ 83550+250%) || (2747/min) (785+250%/min)
Physique: 462/1000
Mental: 529/1000
Perception: 404→ 432/1000
Water: 24/100%
Wind: 21.4/100%
Fire: 20.7/100%
Earth: 20.7/100%
Lightning: 20.9/100%
Yin: 40.3/100%
Yang: 40.1/100%]
[Skill points: 2282]
[Reduction of Chakra Wastage: 100%]
[Reduction of Senjutsu Chakra Wastage: 50%]
***
Shoutout to Densys Bratini and Colin Chapman!!
Read 30 advance chapters here—
Patre on.com/Fanharem
And do vote some powerstones~
Join the discord for well... uh, dead chat room~
https : //discord.gg/egdFUe5