Naruto: The Sage Body of Konoha

One day later.

Outside Konoha Village, at a training ground.

Heiyan was deeply focused on researching the Flying Thunder God technique.

The Flying Thunder God was a sealless technique with extremely high training requirements.

It demanded that a ninja have lightning-fast reflexes, vast chakra reserves, and razor-sharp chakra control.

Even disregarding these strict conditions, there was still one crucial talent required during the training process for the Flying Thunder God.

That was sensory ability.

In the original Naruto story, both users of the Flying Thunder God — Tobirama Senju, the Second Hokage, and Minato Namikaze, the Fourth Hokage — possessed nearly abnormal sensory abilities.

Tobirama Senju didn't need hand seals; simply touching the ground with two fingers allowed him to sense the number of enemies several kilometers away and their chakra strength.

Minato Namikaze could also use the finger-to-ground method to detect enemy numbers and positions on the battlefield.

Actually,

this extraordinary sensing ability was essentially mastery over space and distance — exactly what constituted a Space-Time Ninjutsu talent.

The Flying Thunder God was an ultra-high-speed combat technique.

For its user, sensing the enemy's position, state, and next move ahead of time was the absolute minimum requirement.

Only by mastering every movement of the enemy could one anticipate their tactics, discover weaknesses, and then use the Flying Thunder God to instantly teleport and deliver a fatal strike.

Otherwise, rushing into battle blindfolded would only lead to pointless death — like walking straight into your own grave.

In short, the Flying Thunder God without sensory ability was as useless as a headless chicken.

Heiyan fully met all the criteria necessary to master the Flying Thunder God.

His Sage Transformation naturally provided him significant advantages in nerve reaction speed and chakra reserves.

Through training in his Kekkei Genkai — Storm Release — Heiyan developed exceptional precision in chakra control.

Born into the Uzumaki clan, he had possessed outstanding sensory abilities since childhood. After awakening his Sage Transformation, this sensory ability had been further enhanced.

And while in Sage Mode, his perception would increase dramatically.

Combined together,

in the current world of shinobi, there was likely no one more suitable for mastering the Flying Thunder God than Heiyan.

The principle behind the Flying Thunder God was actually quite simple, consisting of just two steps:

[Step One]: Leave a marking formula somewhere;

[Step Two]: Use that formula to perform spatial movement.

Let's start with the formula.

Fundamentally, the Flying Thunder God formula was a portion of the user's chakra used to mark target locations for sensing.

The formula could be either a pattern or text, similar to a personal signature, with no fixed form.

For example, Tobirama Senju's Flying Thunder God formula was a design consisting of three parallel lines enclosing a circle;

while Minato Namikaze's formula was the four-character phrase *Ninja Ai no Ken* (The Sword of Ninja Love).

Once a formula was established, spatial movement using the Flying Thunder God became possible.

However, note that if the formula was damaged, disappeared, or could no longer be sensed due to excessive distance, the Flying Thunder God would become unusable.

As Heiyan studied this, he suddenly felt an inexplicable sense of familiarity with the principle behind the Flying Thunder God Technique.

A lightning bolt flashed through his mind.

Reverse Summoning!

Yes, Reverse Summoning.

Heiyan had once been summoned from Konoha to Mount Myoboku by Guagua the Stealth Frog using this method. What if he replaced Guagua with a Flying Thunder God formula...

It would be equivalent to Heiyan using a formula to summon himself from Konoha to Mount Myoboku.

I summon myself.

This was the essence of the Flying Thunder God Technique: a form of reverse summoning.

When he realized this, Heiyan finally understood why Minato Namikaze had been able to further improve the Flying Thunder God Technique.

He speculated that the evolution of the Flying Thunder God went like this:

Initially, the Second Hokage Tobirama Senju invented the Flying Thunder God, giving this ninja art its preliminary form.

At this stage, the Flying Thunder God had range limitations. Its maximum teleportation distance was equivalent to Tobirama Senju's sensor range. Combined with its high chakra consumption, it could only be used as a last-resort secret technique.

This move had once helped Tobirama Senju turn defeat into victory, killing his powerful enemy Izuna Uchiha. However, due to its shortcomings, it failed to help him escape successfully from the pursuit of Kinkaku and Ginkaku.

Later, the Fourth Hokage Minato Namikaze inherited the Flying Thunder God Technique.

As Jiraiya's disciple, Minato Namikaze traveled to Mount Myoboku where he learned Sage Arts and forged a contract with Gamabunta.

During this process, Minato encountered the extremely rare Reverse Summoning technique, which he used as reference material. After several years, he finally succeeded in perfecting the Flying Thunder God.

The most significant improvement of the Flying Thunder God Technique after Minato refined it was, just like Reverse Summoning, no longer limited by sensor range.

In the original timeline, Minato had once used the Flying Thunder God to send people directly from Konoha to the Allied Ninja Forces' battlefield.

"In this case, with Guagua's help, I can also refer to Reverse Summoning techniques to improve the Second's Flying Thunder God."

Thinking about this, Heiyan murmured to himself.

Still, he needed to start with the basics—mastering the original Flying Thunder God before even thinking about improving it.

Only after mastering it could he then consider modifying and enhancing it.

Therefore, Heiyan picked up the Thunder God Sword.

He extended two fingers and followed the chakra flow route recorded in the Flying Thunder God scroll, channeling his chakra to the tips of his fingers.

Then, after slight consideration, he used his finger to write four black words on the hilt of the Thunder God Sword:

[Wind, Forest, Fire, Mountain] — an ancient idiom from Sun Tzu's *Art of War*, specifically the chapter "Maneuvering Armies," recalled from a memory of his past life.

Its speed is like wind, its silence like forest, its aggression fierce as fire, and immovable as mountain.

Interestingly, this phrase also appeared in the Naruto world.

Heiyan remembered clearly that outside the Hokage office corridor there were many hanging four-character proverbs, one of which read "[Wind, Forest, Fire, Mountain]."

It represented an unyielding spirit of combat.

Heiyan examined the formula inscribed on the hilt of the Thunder God Sword.

The chakra within this formula was uniquely encoded, making it permanent once inscribed.

Only Six Paths chakra could erase it.

"Shoo!"

Heiyan hurled the Thunder God Sword forward. It flew through the air for over a hundred meters before finally embedding itself into the trunk of a large tree.

Then, Heiyan performed the Shadow Clone Jutsu and created over a dozen clones in one breath.

Time to officially begin training.

One of Heiyan's Shadow Clones stepped forward from the group.

Placing his right hand over his chest with fingers pointing upward like a blade, he focused intently while refining Chakra, sensing the jutsu several hundred feet away.

After a brief moment—

[Flying Thunder God—activate!]

The clone channeled Chakra and vanished from the spot in an instant.

Was it successful?

Both Heiyan's original body and other clones simultaneously turned their gazes toward the tree where the Thunder God Sword was embedded.

However, after several seconds, nothing happened at all.

It was as if that particular Shadow Clone had simply vanished from existence.

Just then,

A sudden dizziness struck Heiyan. At the same time, broken fragments of memory poured into his mind.

"The Shadow Clone... got lost in a spatial rift during teleportation…"

Heiyan muttered.

Indeed, just as he had suspected.

Practicing the Flying Thunder God carried significant risks. One could never rashly attempt it with the original body—it was essential to use Shadow Clones to explore and accumulate experience step by step.

With this method clarified, the path ahead became much simpler.

Heiyan kept sending out Shadow Clones to make repeated attempts. After about ten attempts, one finally succeeded.

The success rate was roughly one in a dozen.

Clearly insufficient.

So, he continued practicing.

For the next three days straight, Heiyan fully dedicated himself to mastering the Flying Thunder God technique. He trained from dawn till dusk, exhausting himself every single day.

But persistence paid off.

Within a hundred-meter range, his Flying Thunder God success rate gradually climbed—from one in ten, to one in eight, then one in five, one in three...

Eventually nearing nearly one hundred percent.

At the training ground—

Whoosh!

Heiyan vanished instantly from his spot. Almost simultaneously, he reappeared over a hundred meters away, both feet lightly landing atop the blade of the Thunder God Sword embedded in the tree trunk.

It was an incredibly stylish move.

Thus, the first stage of mastering the Flying Thunder God technique could be considered complete.

Such rapid progress was nothing short of lightning-fast.

How could he master a Ninjutsu so quickly? The answer was clear—innate talent combined with the Multi-Shadow Clone technique.

Next, Heiyan's training plan involved increasing the range of the Flying Thunder God—from one hundred meters to one kilometer, then further extending it up to five kilometers.

Five kilometers marked the maximum precise Sensor range he currently possessed.

Actually…

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