They traveled through time at the same time, but the villainous scientist

Chapter 18 [The Book of Sealing]

A secret room deep within the Hokage's office in Konoha Village.

The air was heavy and oppressive, with only the flickering candlelight on the walls illuminating the huge scroll on the central stone platform.

Hiruzen Sarutobi personally brought Orochimaru here and solemnly broke the seal on the scroll.

"Orochimaru, remember this: every technique here could have disastrous consequences."

"Research is acceptable, but it must never be abused."

"Furthermore, this book is forbidden to be taken out of this place."

The Third Hokage's voice carried an undeniable air of authority.

"is teacher."

Orochimaru bowed slightly, but his eyes were already drawn to the ancient scroll that had been unfurled.

After Hiruzen Sarutobi left, the stone door to the secret chamber slowly closed, isolating it from the outside world.

Orochimaru then straightened up, walked slowly to the stone platform, and his gaze fell on the scroll.

This scroll is none other than the Leaf Village's secret treasure, the "Book of Sealing Techniques," which records countless forbidden techniques...

He took a deep breath, suppressed his excitement, and began to browse carefully.

The first thing that catches the eye is the [Multiple Shadow Clone Technique].

"Hmm... The principle is similar to the Shadow Clone Technique, except that you can create hundreds or thousands of clones with just one hand seal."

Orochimaru glanced at it a few times and then lost interest.

This kind of technique, which relies on a large amount of chakra to create quantity, lacks skill and is of little value to him.

He continued to look down.

【Flying Thunder God Technique】.

The pinnacle of space-time ninjutsu, invented by the Second Hokage and popularized by the Fourth Hokage.

Achieving instant teleportation through marking is quite impressive.

But Orochimaru only glanced at him briefly.

Although the Flying Thunder God Technique is of great research value, that's not what interests him most.

[Multiplicative Detonating Talisman].

A forbidden technique that summons a large number of explosive tags to create an endless series of explosions.

It is incredibly powerful, but it is essentially an application of detonation tags and cannot be considered revolutionary.

Orochimaru's gaze moved rapidly, as one powerful and bizarre forbidden technique after another flashed before his eyes.

His expression remained calm until…

Edo Tensei!
These four words made him stop looking.

He carefully read the records about this technique.

The usage instructions are described quite clearly:
Firstly, a living person is needed as the vessel for the soul's descent.

Secondly, it is necessary to obtain a certain amount of bodily tissue from the deceased, such as blood and hair, as "coordinates" to connect the soul of the deceased.

Thirdly, by forming hand seals and casting spells, the chakra (soul) of the deceased existing in the "Pure Land" is forcibly recalled to the mortal world and attached to a vessel.

The procedure is complete.

The pages even included detailed hand seals and precautions for the ritual.

"Is that all..."

Orochimaru looked at the records and fell into deep thought.

In principle, this technique is not particularly complicated.

The core can be broken down into two parts:
The first is the "search" mechanism.

Using the deceased's living tissue as unique "keywords," the target's chakra information is precisely located in the "Pure Land" database of the dead.

The second is "summoning and possession".

Through specific techniques, the retrieved chakra (soul) is forcibly pulled back from the Pure Land to the real world and attached to a pre-prepared vessel, thus completing the "reincarnation".

"interesting……

"Unfortunately, this technique is probably only half-finished." Orochimaru murmured, shaking his head with some regret.

He had been wondering before, given the Second Hokage Tobirama Senju's personality and pragmatic approach, if the Impure World Reincarnation technique had truly been perfected to the point of being able to summon powerful individuals at will, why wouldn't he have used it during the First Shinobi World War?

If they could summon the First Hokage, Hashirama Senju, and Madara Uchiha directly, the entire ninja world would probably be crushed by Konoha.

It seems that this technique is currently only a work in progress...

Orochimaru's eyes gleamed with contemplation.

In any case, in his view, the research value of this technique far exceeded that of the ones he had seen before.

"This is my next research topic."

Orochimaru nodded. The Impure World Reincarnation technique likely touches upon the true nature of chakra energy.

Ordinary elemental escaping techniques, whether fire, water, or lightning, essentially involve using one's own chakra to simulate the "characteristics" of natural phenomena such as fire, water, and lightning through nature transformation.

For example, the [Fire Release: Great Fireball Technique] does not actually spew out flames made of plasma, but rather a "ball of chakra energy with the characteristics of high temperature and combustion of flames".

Its essence is still chakra.

This is why the Otsutsuki clan's "Karma" or certain special sealing techniques can absorb these ninjutsu.

Because what they absorb is the chakra that constitutes ninjutsu itself.

In theory, performing this type of Five Elements Escape Technique only requires two steps:
First, it changes the nature of chakra, giving it specific attributes.

Secondly, there is the transformation of form, which involves shaping chakra with specific attributes into desired forms, such as fireballs, water dragons, spears, and so on.

His teacher, the Third Hokage Hiruzen Sarutobi, was known as the "Professor of Ninjutsu" because he had mastered the nature and form transformations of chakra to an unparalleled and superb level.

For the Third Hokage, whether he used Fire Dragon Bullet, Water Dragon Bullet, Great Fireball, or Wind Slash Technique, the difference was not significant; they were all just combinations and manipulations of chakra with different attributes and forms.

However, this still remains at the level of "application" of chakra as a form of energy.

Just as humans learned to use fire for warmth, lighting, grilling, and even forging metals, it doesn't mean they understood the chemical nature of "combustion."

Ninjutsu itself is a technological black box. Users do not need to know the principles. They can activate the corresponding ninjutsu simply by forming hand seals and guiding chakra to flow along specific meridians.

Simply put, it's similar to a handgun. You don't need to know how to use a handgun; you just need to pull the trigger.

These ninjutsu techniques did not truly delve into the core question of "what exactly is chakra?"

And [Edo Tensei]...

It directly communicates with the so-called "pure land," recalling the chakra (soul) of the deceased.

Then the summoned dead can still exert 100% of their former abilities, and can even activate their bloodline limit.

This cannot be explained by simple changes in properties and forms.

This may have touched upon the mysterious realm between chakra and soul, life and death.

This is the fundamental knowledge that Orochimaru truly yearns to explore!
only……

Orochimaru frowned slightly.

The Book of Seals contains only the "instruction manual" for the Impure World Reincarnation technique.

As for how this technique was developed by the second generation?

What is the theoretical basis? What attempts and failures were involved in the process?

Related research notes and experimental data...

None at all!
"There are only application methods, but no detailed explanation of the development process and underlying principles..."

This made him a little disappointed.

Without theoretical support and research records, it is extremely difficult to reverse engineer the complete principle based solely on a single usage method.

Where would the Second Hokage's research records be stored?

Orochimaru's eyes flickered.

Tobirama Senju.

The name immediately reminded him of another person.

Tsunade from the Senju clan!
Perhaps the Senju clan's ancestral lands preserve the Second Hokage's research materials on the Impure World Reincarnation technique?

(End of this chapter)