One hundred meters below the Fire Shadow Rock.

Hiruzen Sarutobi used Earth Release to sneak in, breaking through the many seals and arriving at a long, narrow basement.

A faint smell of decay lingered in the air, and the walls and ceiling were made of dark, hardened earth-stone.

The rusty lab bench and the culture tanks along the wall are lined up with all sorts of 'materials'.

The farthest incubation tank is quite eye-catching, covered with a dense array of sealing spells, and a thick, transparent tube extends from the bottom and pierces into another chamber.

This is Tobirama Senju's secret chamber.

He had been to this place before, long ago.

However, Tobirama Senju's research approach was truly astonishing...

After only briefly flipping through it, feeling that he could neither control it nor sustain it, he reinforced the seal, took the notebook, and sealed a large amount of equipment deep underground.

Hiruzen Sarutobi had long been extremely interested in this.

However, when I first arrived in the ninja world, this matter was not my top priority.

Once he was able to move his hands and feet a little, the Hokage came over with great interest.

Recalling how he almost got injured by an explosion twenty years ago because he was unfamiliar with Tobirama Senju's defensive formations on his first visit, he couldn't help but smile slightly.

Holding the second generation's research notes, Hiruzen Sarutobi checked each of these astonishing unfinished products one by one.

"This dark, gooey thing, it's probably that monster that absorbs negative energy from people's hearts, right? It's a pity it's lifeless..."

Hiruzen Sarutobi marveled at Tobirama Senju's creativity.

The Second Hokage once proposed an idea to use the negative energy that always exists in people's hearts to create a monster that can survive in this way, as an artificial tailed beast.

This was called the "Zero-Tails" by the Second Hokage.

"How many Sharingan are there? A single tomoe, a pair of three-tomoe eyes..." This is most likely spoils of war captured during the Warring States period.

However, the number was less than Hiruzen Sarutobi had imagined.

After all, Tobirama Senju's notes contain a very detailed and thorough analysis of the Sharingan.

From its causes and structure to its specific mechanisms of action, and even the methodology of "opening eyes" (a metaphor for broadening one's horizons), everything is listed.

Now, find a three-tomoe Sharingan user from the Uchiha clan's territory. If we could get him to debate Sharingan with Tobirama Senju...

Hiruzen Sarutobi believed that his teacher could persuade the other party to their heart's content.

This guy must have had the Mangekyou Sharingan in his past life, otherwise how could he understand so much?

can only say.

No one understood the Uchiha clan better than Tobirama Senju!

Standing before the cultivation tank, which resembled a black coffin, Hiruzen Sarutobi looked up and gazed at it.

He could vaguely guess some of it.

Based on research notes and Hiruzen Sarutobi's past memories, plus a little speculation.

Even before the First Shinobi World War, Tobirama Senju was already considering how to use bioengineering technology to enhance Konoha's strength...

His first thought was about the injured ninja.

Ninjas need to perform hand seals to help injured ninjas recover their bodies. This is clearly a righteous path in terms of both its purpose and function, and it aligns well with the Will of Fire…

But as things progressed, Tobirama Senju began to consider the issue of cloning entire people.

I can understand Hiruzen Sarutobi's situation though...

After all, we're not even talking about figures like Hashirama Senju or Tobirama Senju...

Even the bodies of elite Jonin, even when used as puppets, would possess considerable combat power.

But clearly, Tobirama Senju failed.

His research shows that for a ninja with chakra to develop from cells into a human body, it's not as simple as just having a genome.

The more talented a ninja cell is, the more likely it is to grow into a messy and useless tissue when it tries to be cloned.

Tobirama Senju speculated that this phenomenon might be closely related to the "maternal growth environment" and "soul nourishment," and listed many interfering factors...

Based on Hiruzen Sarutobi's current knowledge, both he and Tobirama Senju believe that unless the other party's body has certain special characteristics, it is difficult to replicate ninjas on a large scale.

The only way is to make fine adjustments step by step and conduct continuous experiments, hoping to stumble upon the correct result by sheer number of attempts.

Perhaps we can find some solutions to this problem when technology advances further.

After breaking the outer seal of the black coffin, what came into his view was...

It was the body of a boy who looked both familiar and unfamiliar, about fourteen or fifteen years old.

He had messy black hair, a handsome face, and his features resembled Tobirama Senju, but not entirely.

"Hehe, teacher..."

Alone in the laboratory, the usually composed Hokage's lips twitched involuntarily: "Although I haven't met him, the recipient of this cell fusion is probably that person you keep mentioning in your notes, right?"

His name is Uchiha Izuna!

Hiruzen Sarutobi turned his head to look at the other part connected to the jar.

It contained a large number of cells that resembled wood, and with a slight sense of them, one could tell that they were from Hashirama Senju.

"Should we use water infused with Hashirama's cells, filtered through sealing techniques, and then circulate this water to nourish this body?"

It's hard to say whether respectable people have the habit of keeping a diary.

But researchers definitely have the habit of keeping records.

While covering the rear on the battlefield, Tobirama Senju, who hadn't had time to erase his "life browsing history," was completely exposed to Hiruzen Sarutobi, who inherited his legacy.

They were really enjoying it!

Upon seeing the experimental subject, Hiruzen Sarutobi's imagination ran wild, and he suddenly connected some fragments of information in his notes, constructing a short story.

One day, Tobirama Senju used the Flying Thunder God Slash to pierce through an enemy's chest, tearing off a piece of flesh.

They treasured it and began cultivating it.

After he became Hokage and gained control of resources, he attempted to cultivate the cells of his enemy during an experiment, driven by some strange motive.

Furthermore, it was discovered that adding their own cells turned a completely failed experiment around.

After countless minor adjustments and refinements, he actually managed to create a fully formed human body!

It was solidified in the culture tank using a multiple sealing technique.

Waiting to return from the battlefield, then continuing the research…

only…

Hiruzen Sarutobi stared at the joints of this body and noticed that they seemed to have defects, like the nodules that would appear in a person whose meridians were broken.

Having already thoroughly read and almost memorized the notes, he immediately thought of the challenges involved.

What can help ensure smooth conduction of energy through the meridians?

"Mrs. Mito might know, but if I ask her, she'll realize what I'm thinking."

"It's troublesome. My older brother has repeatedly told her to keep a close eye on my research."

Actually, these weren't in the notes; there were only scribbled strokes of "meridian conduction" and "Mito's name crossed out."

But Hiruzen Sarutobi's eyes seemed to have traversed time and space, seeing Tobirama Senju's thoughts back then...

Whether it's true or not, let's just deduce it this way!

Anyway, the dead can't refute him for the time being...

Hiruzen Sarutobi felt a little sore.

The things Tobirama Senju did to Izuna Uchiha can hardly be described as a fight to the death.

If you changed your gender, you could totally submit your angst-filled romance novels and dominate the charts.

I really don't understand the relationship between the Senju and Uchiha clans...

"I was originally thinking about the body, but now that there's a ready-made one, it's convenient, though it needs a little improvement."

"Since you don't dare ask about Lady Mito, I will ask her!"

The Hokage of Konoha slowly closed the seal on the jar.

Without him, this research might have remained buried under the cloak of Konoha forever.

As time goes by, it may collapse or be completely erased as a forbidden zone in history by a certain generation of Hokage.

But now it's different.

Konoha, we need to start accelerating!

Sigrún has taught at the Iceland University of the Arts as a part-time lecturer since and was Dean of the Department of Fine Art from -. In – she held a research position at Reykjavík Art Museum focusing on the role of women in Icelandic art. She studied fine art at the Icelandic College of Arts and Crafts and at Pratt Institute, New York, and holds BA and MA degrees in art history and philosophy from the University of Iceland. Sigrún lives and works in Iceland.

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