Kekkei Genkai, Large Mangekyo

"Moreover, it doesn't feel like a complete living organism to me, but more like something... artificially created."

"The Second Hokage is indeed perceptive." Uchiha Jun walked to the sealing barrier, raised his hand and gently pressed it on one of the sealing stakes. "Zero-Tails —to be precise, it's [Zero-Tails: Darkness of Nothingness]."

"It is definitely not Tailed Beasts."

"It is—a hybrid of Demon Beast Moryo, Mangekyo Dōjutsu, and solutions provided by my subordinates."

"Utilizing the characteristic of Demon Beast Moryo that can absorb human dark emotions and convert them into Chakra, this power reactor can continuously provide Chakra to power the Sky Fortress. Under overload conditions, it can even provide the amount of Chakra of a Super-Kage Level being per second!"

Tobirama Senju remained silent. He slowly stepped forward, walked to the observation window, and carefully examined the two energy cores suspended in the center of the array.

The Amaterasu Power Reactor is based on Jun Uchiha's Mangekyou Sharingan eye technique. It continuously outputs an inextinguishable black flame through an eye power transmission device, and then the heat generated by the burning Amaterasu flame is converted into power by a conversion array.

"With both power plants operating simultaneously, the energy supply for the entire fortress can be continuously provided."

Uchiha Jun turned around, looked at Tobirama Senju, and smiled slightly.

Tobirama Senju remained silent for a long time.

He was once the Hokage of Konoha, and was one of the top Ninjutsu developers and researchers of that era.

He developed the Flying Raijin Jutsu, Shadow Clone Jutsu, and the forbidden technique Impure World Reincarnation. He believed he had witnessed the most advanced technology and Ninjutsu in the Shinobi World.

But what he was seeing was truly beyond his comprehension.

Uchiha Jun walked to the control panel next to him and casually pressed a few buttons. "Take a look at this technology."

Tobirama Senju leaned closer. The screen displayed dense data streams and structural diagrams, the content of which was very simple and clear. Tobirama Senju Sharingan.

But it was completely different from what he knew during his lifetime—it was a technical solution for mass-producing Sharingan!

"Mass production of Sharingan?"

"I didn't expect you to actually master it. What was the cost?"

Although he knew that Uchiha Jun could mass-produce Sharingan, Tobirama Senju couldn't help but be surprised when he actually saw the blueprint for this technology.

Back in the Warring States Period, Uchiha Clan ninjas did many things in order to awaken Mangekyo Mangekyou Sharingan, including murdering their wives and mothers, and slaughtering their comrades.

Now that Uchiha Jun is already in mass production, it's somewhat of a dark joke in comparison.

"That depends on whether it's the Mangekyo or the Mitsudomoe. As for the Mitsudomoe, Orochimaru and I can currently mass-produce them; the difference lies in the speed of mass production."

"Compared to the Mangekyo, which requires strong emotional stimulation, the Mitsudomoe requires much weaker emotional stimulation. Therefore, it can be mass-produced using cloning technology. In terms of cost, it would be about ten million for Two-Tomoe Sharingan and twenty million for a pair of Three-Tomoe Sharingan."

"Mangekyo cannot be mass-produced using cloning technology alone. I need to perform a soul replacement procedure to induce their creation. In addition to this procedure, the cost of a clone with the talent to support the awakening of the Mangekyo is around fifty million."

"If a Mangekyo containing high-quality Dōjutsu is required, then an additional ten to twenty million will be needed."

"I won't say too much, I won't ramble on. Let me take you to your next research lab."

"Arrive."

Uchiha Jun stopped in front of a huge metal door.

This door was thicker and heavier than any of the doors we had passed before, its panels covered with densely packed sealing formations and barrier runes.

This is a laboratory specially designed by Uchiha Jun based on the Tobirama Senju [Impure World Reincarnation]. Even if Tailed Beast Ball is performed inside, and the Tailed Beast Ball explodes, 90% of the power generated by the explosion will be contained within the laboratory and will not interfere with the entire Sky Fortress.

Every laboratory has this design; the only difference is the strength.

Considering Tobirama Senju's fearless and reckless nature, this item has the highest strength.

Uchiha Jun reached out and placed his hand on a palm print groove in the center of the door panel.

Instantly, all the runes on the door panel lit up, emitting a blinding blue light.

Immediately afterwards, a dull mechanical sound rang out, and the door panels slowly opened to both sides, revealing a bright corridor.

At the end of the corridor was a huge laboratory.

Tobirama Senju was stunned the moment he saw the laboratory.

He had his own research institute in Konoha during his lifetime, but the scale of the laboratory before him far exceeded his expectations.

The laboratory is at least half the size of a football field, with a ceiling over ten meters high. The entire laboratory is divided into more than a dozen functional areas, each containing different equipment and experimental materials.

There were culture tanks, centrifuges, Chakra analyzers, sealing array simulation platforms, Ninjutsu testing devices... and even a huge mechanical device that emitted faint Chakra fluctuations, which Tobirama Senju couldn't recognize.

However, judging from its scale and placement, the cost is not low!

"This... this is your laboratory?" Tobirama Senju walked into the laboratory, looked around, and his voice was filled with disbelief.

"This was prepared especially for you." Uchiha Jun followed him in, hands in his pockets, his tone casual.

"I heard that you were very interested in the research of Kekkei Genkai when you were alive. Unfortunately, Konoha's resources were limited at the time, and many of your ideas could not be realized. Therefore, I specially prepared this laboratory for you. It is fully equipped and has plenty of materials. You can research whatever you want."

Tobirama Senju remained silent. He walked to the nearest culture tank and carefully examined the liquid inside.

The liquid in the culture tank was pale green and emitted a faint Compound odor. Several Sharingan samples were soaking in it.

No, it's not just the Sharingan.

Tobirama Senju leaned closer to examine them carefully—the pupils of those samples did indeed contain Sharingan Tomoe, but in addition, there were some structures he had never seen before.

It appears to be Kekkei Genkai Dōjutsu from another country.

"This is... a sample of Kekkei Genkai?" Tobirama Senju turned to look at Uchiha Jun, his voice tinged with surprise.

"Yes, the sample materials here cover more than 80% of the Kekkei Genkai samples in the Shinobi World. I have drawn several tubes of blood samples from every single one of them who has a name."

"By the way, weren't you curious about the entire technical process for mass-producing Sharingan, as well as the data and information on the Giant Tenseigan, and the various technological achievements of the Kekkei Genkai?"

"That's the material you'll be studying coming out over there."

As he spoke, Uchiha Jun pointed to a mountain of documents piled up in a corner not far away.

Tobirama Senju stood in the laboratory of the Sky Fortress, looking at the mountain of documents before him, and remained silent for a full half minute.

This was the first time he had felt true shock since his Impure World Reincarnation.

Tobirama Senju's voice was incredibly hoarse, "Uchiha Jun, are you sure you're not joking?"

Uchiha Jun leaned against the edge of the lab table, arms crossed, a calm smile on his face, "Does the Second Hokage think I'm the kind of person who would joke about something like this?"

Tobirama Senju did not answer.

He strode to the pile of documents and opened the first file: <The Awakening Mechanism of the Mangekyō Sharingan and the Artificial Induction Synthesis Plan>.

The densely packed data, anatomical diagrams, Chakra flow path diagrams, and dozens of records Sharingan are all vividly presented on the paper.

Tobirama Senju's pupils suddenly contracted.

With his experience and knowledge, he assessed the value of the materials in less than ten minutes.

This is really true.

"You..." Tobirama Senju raised his head, his gaze towards Uchiha Jun becoming complicated. "How many pairs of Mangekyō Sharingan do you possess?"

"Ten pairs of the standard model, readily available."

"Five pairs are [Tsukuyomi] and [Amaterasu], and the rest are some Dōjutsu Mangekyo with varying effects."

"If you need more Mangekyo to fuse with the Giant Mangekyo, I have a batch of prototypes currently being cultivated, which can produce another twenty pairs within a week."

"Of course, I know it's a bit much to expect to create a giant thunder eye the size of a house from this Mangekyo, but if you can fuse an eyeball as tall as a person, I can provide it to you."

"..."

Tobirama Senju felt a throbbing sensation in his temples.

He turned to look at Orochimaru beside him, only to see Orochimaru, who had been waiting in the laboratory, with a faint smile on his lips.

"Orochimaru, you were involved too?" Tobirama Senju asked.

"Second Hokage, you jest." Orochimaru licked his lips. "I only provided a few minor optimizations to the cloning technology. The one who truly led this project was Jun-kun."

"Chunjun... he is the true genius."

Tobirama Senju was silent for a moment, then took a deep breath and put down the documents. "Since you've put me in charge of the Kekkei Genkai project, let me first confirm—what kind of Kekkei Genkai do you want?"

Uchiha Jun smiled.

"What I want is Kekkei Genkai that can be mass-produced, that ordinary ninjas can master, and that can create a qualitative advantage on the battlefield."

"To increase the power ceiling of my 'Back-Pounding Clones Army'."

Tobirama Senju narrowed his eyes. "Your ambitions are quite large."

"If I didn't have big ambitions, I wouldn't have recruited 'dead people'," Uchiha Jun shrugged. "Besides, I haven't missed a single thing I promised to do."

"..."

Tobirama Senju did not refute this.

Because he did see it.

I saw the "Sky Fortress" this young man spoke of, I saw this self-contained little society, I saw children who no longer needed to learn how to kill, I saw the orderly production areas, living areas, schools, hospitals...

All of this was beyond his imagination.

Senju Hashirama and Madara Uchiha founded Konoha Ninja Village so that their children would never have to go to war again.

But Uchiha Jun's future is one where children no longer need to become ninjas.

There's an era between these two.

"Alright." Tobirama Senju finally relented. "I'll take on the Kekkei Genkai project."

"Well, here's the list and the treatment I'm giving you two brothers. What do you think?"

Seeing that the nuclear-powered donkey he had summoned from the Impure World Reincarnation had begun to exert its power, Uchiha Jun nodded in satisfaction, then took out two payment contracts and handed them to Senju Hashirama and Tobirama Senju.

Although the two are currently under Uchiha Jun's control, since they are doing work, they should be paid.

Uchiha Jun, holding two documents, walked up to Senju Hashirama and handed him one of them.

"First, this is yours."

Senju Hashirama paused for a moment, then took the document. "What's this?"

"A payment contract," Uchiha Jun said, turning to Tobirama Senju and handing him another copy. "This is yours."

Tobirama Senju frowned, took the document, but didn't open it immediately. Instead, he looked at Uchiha Jun, "A compensation contract?"

"You're working for me now, right?" Uchiha Jun took two steps back, hands in his pockets, expression calm. "Since you're working for me, you should get paid."

Senju Hashirama scratched his head and chuckled, "Junko, you're being too kind. I've already died once, what more could I want in return...?"

As he spoke, Teuchi the document cover.

Then, his smile froze.

Tobirama Senju also opened the document. His gaze swept over the first page, and then his pupils suddenly contracted.

A brief silence fell over the entire laboratory.

Senju Hashirama stared wide-eyed at the number on the document, his mouth agape enough to fit a fist.

He counted the zeros after the number several times, then looked up at Uchiha Jun, his voice trembling slightly. "Jun... Jun kid... this... this says... twenty million per month?"

"To be precise, it's a minimum guarantee of 20 million."

"If you achieve results through your research, there will be even greater rewards. For example, if you cooperate with the grain seed research project to cultivate high-yield grain crop seeds and livestock with increased yields, giving you hundreds of millions wouldn't be a problem."

Senju Hashirama glanced down at the document, then looked up at Uchiha Jun, finally taking a deep breath. "Jun, you... you're not kidding, are you? Me, a dead man, what am I worth that much money?"

In fact, even when he was the First Hokage, the most money he ever saw was when he sold the Tailed Beasts. However, he didn't keep that money for long before his younger brother invested it in Konoha's infrastructure.

At that time, Konoha, excluding the Daimyo's aid, only had a few hundred million in annual tax revenue and a share of the ninja missions.

Even if he carries out an S-Rank Mission, he'll only earn a few million taels, and he can't even get S-Rank Mission every month.

That's a minimum guarantee of 20 million, which is quite generous.

"You're worth it." Uchiha Jun's answer was simple and straightforward. "Your Wood Release isn't simply Kekkei Genkai created by fusing two types of Chakra. Rather than Kekkei Genkai, it's more like some kind of innate 'secret technique'."

"Speaking of which, Second Hokage, do you still remember the Kinkaku Ginkaku brothers who killed you back then?"

"... Hmph, I remember."

Upon hearing Uchiha Jun mention his enemy, Tobirama Senju's initially pleased expression regarding the compensation contract turned cold again, and he let out a cold snort.

"Speaking of which, those two brothers were able to control the Tailed Beast Chakra with their bare bodies, and the Chakra of the Nine-Tails was among the most corrosive of the Tailed Beasts. From this, we can see that these two guys probably possess some kind of atavistic phenomenon."

"Atavism?... You mean, eldest brother?"

"That's right. The First's situation was most likely a kind of benign atavism. And I estimate that his ' Wood Release ' is not as simple as a combination of Earth and Water Kekkei Genkai. It may be a more advanced combination of Earth, Water, and Yang Chakra, a ' Kekkei Tōta '."

"These are just speculations; further research is needed to determine the specifics."

"I'm saying all this to show you're worth the price."

Tobirama Senju remained silent, looking down at the document in his hand, his gaze sweeping over the clauses line by line.

The contract was very detailed, including not only the amount of compensation, but also the job duties, working hours, benefits, and so on.

Every point is written very clearly, with no ambiguity whatsoever.

Moreover, judging from the terms, the conditions offered to them by Uchiha Jun were extremely generous.

"You..." Tobirama Senju raised his head and looked at Uchiha Jun, "Why did you offer us such a high reward?"

Uchiha Jun said, "If I had to say, I don't like owing people favors."

"Alright, you two brothers can go explore on your own. I have some things to take care of."

After saying that, Uchiha Jun tossed two scrolls containing a month's payment to the Tobirama Senju and Senju Hashirama, and turned to leave. Orochimaru then handed over the information on his [Kekkei Genkai] [Giant Mangekyo] project to Tobirama Senju before following closely behind.

Tobirama Senju looked at the documents in his hand, remained silent for a moment, and then began to study.

For a day and a night, without sleep or rest.

Tobirama Senju pushed his brain to its limits, and with the advantage of unlimited Chakra under the Impure World Reincarnation state, he advanced his research at an almost insane efficiency.

Until the next morning, when the first rays of sunlight streamed through the laboratory's skylight—

Tobirama Senju raised his head.

His face showed fatigue, but his eyes burned with excitement.

"It's a success."

"Three new Kekkei Genkai."

Uchiha Jun entered just as he heard those words.

He raised an eyebrow, walked to the experimental table, and looked at the three scrolls placed in front of Tobirama Senju.

"You've come at the perfect time. During this period, I've integrated three new types of Kekkei Genkai based on your project framework."

"Thunderclap Release, Glue Release, Pressure Release," Tobirama Senju introduced them one by one.

"Thunderclap Release - Fusion of Lightning and Wind Nature, capable of generating a lightning shockwave with a paralyzing effect. It has a large range and strong control, making it suitable for mid-to-long-range suppression. At the same time, it can enhance the user's speed, making it far exceed the Body Flicker Technique."

"Glue Release - A fusion of water and earth properties, capable of creating a special glue with extremely strong adhesion and elasticity, which can be used to bind enemies or for defense."

"Pressure Release - A fusion of wind and earth properties, capable of creating a localized Gravity Field to suppress enemy movement while simultaneously enhancing the power of one's own attacks."

Uchiha Jun listened carefully, a hint of admiration flashing in his eyes. "As expected of the Second Hokage, three Kekkei Genkai in one day and one night... such efficiency... I'm afraid there's no one else like him in the entire Shinobi World."

"To be honest, it's because you have ample materials and a sound data system framework." Tobirama Senju. "These three Kekkei Genkai are just basic versions; they still require a lot of practical testing and optimization."

"Moreover, what truly interests me is the Giant Mangekyo project."

"Oh?" Uchiha Jun became interested. "The Second Hokage has made progress?"

"Yes." Tobirama Senju picked up a new scroll and handed it over. "Take a look at this."

Uchiha Jun opened the scroll, and there was a complex fusion scheme diagram drawn on it, with various calculation formulas and deduction processes densely marked next to it.

"This is... a classification and fusion scheme?"

With his own technical expertise, Uchiha Jun was able to discern Tobirama Senju's plan.

He and Orochimaru, targeting the producers of the Mangekyō Sharingan, attempted to adjust the Mangekyo to a different 'frequency'.

Tobirama Senju's plan was much simpler and more direct, but its potential was also lower than that of Uchiha Jun and Orochimaru.

However, its advantage lies in its well-developed theoretical framework, allowing us to begin experimental work immediately.

"That's right." Tobirama Senju walked to the whiteboard beside him, picked up a pen, and began to draw. "The plan you and Orochimaru devised was to fuse the same type of Mangekyo. While this method is reliable, it has too many limitations—"

"For example, merging [Tsukuyomi] with [Tsukuyomi] will indeed increase its power, but it is essentially a repetition and accumulation, without producing a qualitative change."

"My plan is to categorize the Mangekyo according to the type of Dōjutsu, dividing it into three major groups—"

"Functional Group, Genjutsu Group, Enhancement Group."

Tobirama Senju quickly drew three sets of classification diagrams on the whiteboard, and then drew a circle in the position of the Genjutsu group.

"Among them, the Giant Mangekyo of the Genjutsu group is the best to construct."

"Because the essence of Genjutsu- type Dōjutsu is mental interference, there is no need to consider too many physical attribute conflicts during fusion. All that is needed is a sufficiently powerful 'blending agent' to coordinate the differences in eye power between different Mangekyo."

"And this 'adjustment agent'—" Tobirama Senju looked up at Uchiha Jun, "Is White Zetsu Cells."

Uchiha Jun nodded approvingly, "White Zetsu Cells... interesting."

"That's right." Tobirama Senju's tone turned serious. "White Zetsu Cells have extremely strong inclusiveness and adaptability, and can serve as a bridge between various different eye powers. As long as the proportions are controlled properly, a stable fusion of the Genjutsu- type Mangekyo Sharingan can be achieved."

"What about the functional group and the enhancement group?" Uchiha Jun asked.

Tobirama Senju shook his head. "These two groups are quite complex. The functional groups involve advanced Dōjutsu such as space and time manipulation. Each pair of Mangekyo has unique abilities, making fusion extremely difficult."

"The difficulty of its creation is no less than that of your Mangekyo 'Synchronization' project."

"The enhancement group involves physical amplification, and the conflicts between different Dōjutsu are also very intense."

"Currently, both groups are still in the research stage, and breakthroughs are unlikely in the short term."

Uchiha Jun nodded, not disappointed.

Instead, a glint of excitement flashed in his eyes.