Spatial–temporal power, spatial–temporal chakra, spatial–temporal nature transformation…
With just one look, Gojo Yoru understood what the black chakra's special effect was.
Everyone knows that ninja chakra has seven attributes: wind, fire, water, earth, lightning, yin, and yang—this world's version of yin–yang and the five elements.
Yin and yang are "hidden attributes." You can only be born with them; you can't cultivate them through training—unless some overwhelming external force remodels your body.
Even the God of Shinobi, Senju Hashirama, and canon Uzumaki Naruto and Uchiha Sasuke couldn't develop yin–yang through training after the fact.
Uchiha Madara only possessed yin–yang and the five elements because he transplanted Hashirama's cells. Otherwise, his ceiling would've been the same as Sasuke's at most: yin plus the five basic elements—six attributes total.
The fusion of two natures is a kekkei genkai.
The fusion of three is called kekkei tōta.
That's the limit of what the shinobi world recognizes.
But Yoru knew: fuse all seven, and you get kekkei mōra.
That's what the pure-blood Ōtsutsuki consider "one of their own."
No kekkei mōra, no all-attribute Ōtsutsuki? Then you're a mongrel among mongrels—no different from the lower lifeforms.
"Only seven chakra attributes" is common knowledge in the ninja world.
Only a handful of people know there's an eighth—an even more special hidden attribute.
It stands above the seven. Its floor and ceiling are both absurd. Some forms are no weaker than kekkei mōra—some are literally a type of kekkei mōra—some are even stronger than kekkei mōra itself.
That power is space–time.
Space–time abilities are actually quite common in the ninja world.
Storage scrolls already involve space–time principles.
Summoning jutsu also involves space–time power.
But those only touch the surface through contracts and seals—and you can't truly apply them to your own body.
So when the Second Hokage, Senju Tobirama, developed the Flying Thunder God Technique and showed the world how terrifying space–time power could be, it instantly became one of the strongest S-rank ultimate techniques in the shinobi world.
To this day, aside from Tobirama—the inventor—Konoha still hasn't produced a second person who can use that S-rank ultimate.
And even the Flying Thunder God is still an auxiliary-type space–time ninjutsu.
Across a thousand years of Warring States history, the ninja world has never produced an offensive-type space–time ninjutsu.
Because no one has ever truly mastered space–time power—let alone transformed their chakra nature into space–time chakra. Not even the pure-blood Ōtsutsuki in the universe can do that!
Their space–time abilities—like Flying Thunder God and Kamui—are essentially "pay chakra (or yin chakra) to invoke a portion of space–time power."
Amenominaka, Yomotsu Hirasaka, Daikokuten… these kekkei mōra and "divine techniques" are all auxiliary space–time abilities.
Meanwhile, Kamui—despite not being a kekkei mōra or divine technique—was the rare offensive-type space–time ability.
Even so, offensive Kamui has wind-up time, consumes massive ocular power, and its functions are fixed. It still isn't "turn chakra into space–time nature transformation."
But now, the first being to possess space–time chakra… had been born.
So it wasn't strange that Gojo Yoru was this excited. The fact he didn't burst out laughing was already the greatest self-control a transmigrator with two lifetimes could have.
In these six years, no one knew how much pressure Yoru had been carrying.
If he'd been born during the era when the plot begins—same age as Naruto and Sasuke—then even without a bloodline limit and without a cheat, he would've accepted his fate and coasted through life.
With his knowledge of the story, he could easily avoid every major disaster except the Infinite Tsukuyomi—and that "disaster" wasn't even that bad. It was basically a beautiful dream.
But of course, he wasn't born then.
Yoru was born in the same era as Namikaze Minato.
The Second Great Ninja War could erupt at any moment, and the canon information about that period was pitifully scarce. Yoru had no idea whether Minato's generation would be sent to the battlefield.
If they were sent—even for logistics—enemy shinobi could infiltrate at any time. And anyone capable enough to infiltrate, especially on a mission, would be at least tokubetsu jōnin level.
Without protagonist plot armor, running into that was a guaranteed death sentence.
The more a transmigrator knows, the more there is to worry about—especially when you're stuck in a time period where you have no plot advantage at all. Yoru's pressure doubled day after day.
That was why his "game guide" had already prepared him to do anything necessary to become strong.
To survive, he was even willing to become a test subject—willing to become some stitched-together monster like Kakuzu or Hiruko—a patchwork abomination.
And to lay the groundwork for that plan, he—an "adult" who understood the importance of networks and relationships—entered school and deliberately built a persona: aloof, unsociable, cold, the "school boss." Every day was acting.
The truth was, on many nights, Yoru would jolt awake from nightmares.
He dreamed that his plan failed before it even began—that someone read his mind, discovered he was from another world, and turned him into an even worse experimental subject.
He dreamed that he finally gained immense power—only to be slapped to death by an even higher-dimensional force, all his effort wasted.
Those nightmares were invisible shackles binding Gojo Yoru.
But now—those shackles had all shattered, the moment black space–time chakra appeared!
His old ceiling—"all-round jōnin at best," and even with the guide perfectly executed, only a pseudo–Six Paths limit—had become blurred and uncertain.
That was the special nature of space–time.
Its floor is low: even ordinary ninja can use space–time principles to make storage scrolls.
Its ceiling is high: even Hatake Kakashi, merely an elite jōnin, could injure the progenitor of chakra thanks to an offensive space–time technique.
With space–time chakra, Gojo Yoru's own "strength" also became ambiguous—his actual threat level now depended entirely on how much black chakra he had, and how he used it.
If he could develop offensive methods, then even as a first-year academy trainee, he would already possess a means to threaten a Kage—just like elite jōnin who wield S-rank ultimate techniques.
Even a Ten-Tails jinchūriki with ninjutsu immunity would be forced to "break defense" if he landed a hit.
If the black chakra couldn't be used for offense, then Yoru's power wouldn't change at all. He'd simply be like the great clans with secret arts or bloodline limits—someone with a special ability.
Even that would be enough for Yoru.
Because his feet… had just turned intangible.
Intangibility—Obito Uchiha's utterly broken, invincible, bug-level ability that carried him through all of Naruto!
As long as Yoru could achieve full-body intangibility, then no one in this era could kill him by any means other than assassination—including that "Asura of the Ninja World" who was still alive right now!
Right now, he was a cut above high-level ninja!