When Tsubasa pushed open the bronze door of the Forbidden Land Sealing Jutsu Library, he was choked by the overwhelming aura of runes and coughed. Tens of thousands of leather book boxes were stacked on top of each other, and the dome above his head was carved with intricate spacetime runes. The intersecting lines seemed to be slowly writhing, as if they were weaving mysterious trajectories with a life of their own.
"Startled?" Uzumaki Ashina, leaning on his peachwood cane, walked slowly over. With each step the red-haired old man took, a semi-transparent sealing array appeared on the ground. His wrinkled hands gently stroked the bookshelf; where his fingertips touched, the book boxes automatically popped open, revealing yellowed parchment scrolls. "These are no ordinary books; each one contains the memories of Sealing Jutsu from different eras."
Tsubasa reached out and touched the nearest book, suddenly feeling a chill in his palm. Countless golden characters shot out from the pages, forming a dynamic rune display before his eyes. "This... this is a holographic projection? Is this Naruto? This is a bit like science fiction!" The boy took a half-step back in surprise.
After Uzumaki Ashina twisted another bookshelf, the mechanical sound of gears turning rang out, and the entire row of bookshelves split open as if they were alive, revealing a hidden chamber.
Uzumaki Ashina laughed loudly, "This is just an advanced rune memory replication device. The real treasure is below--" He drew complex runes on the ground, and the entire library suddenly began to rotate, revealing a staircase leading underground. Liquid metal-like characters floated on both sides of the staircase, and those flowing characters seemed to be telling the ultimate mystery of the universe.
" Setsuna Splendor Space." Uzumaki Ashina appeared at the end of the stairs, a mysterious purple light swirling in his pupils. "This isn't an ordinary time acceleration device. Look—" He raised his hand, summoning a semi-transparent holographic model of runes. A spatial structure composed of countless light particles slowly unfolded in the air. "This space is nested between reality and dimensional void, achieving a difference in flow rate by distorting the time dimension through advanced runes. Every second that passes outside is stretched 360 times within."
Tsubasa's heart nearly leaped out of his chest. He had read similar theories in the Runic Spacetime Theory at Mito Uzumaki's place, but the real device before him far exceeded his imagination. "That air circulation system and energy supply..."
"Good question." Uzumaki Ashina nodded approvingly, his withered fingers tracing complex formulas in the air. "See those writhing runes on the dome? They form a self-circulating energy matrix, drawing energy from parallel universes using the rune energy tunneling effect. As for the air—" He suddenly snapped his fingers, the runes on the walls lit up, and the air flowed around everyone in a transparent vortex, "... through wormhole technology, fresh air is transmitted from the surface in real time, with an error of no more than 0.1 seconds."
Tsubasa felt his brain was about to overload. These designs, far surpassing modern technology, were actually the work of Sealing Jutsu master from a thousand years ago. What shocked him even more was that this space was also equipped with a cognitive filtering system to prevent users from experiencing mental breakdown due to time distortion. "But why can't we cultivate? If we cultivate inside for a hundred years, wouldn't we be invincible when we come out?" he couldn't help but ask.
"When we first saw the Setsuna Splendor Space, everyone thought the same as you—a year inside is only a day outside, wouldn't the Uzumaki Clan be invincible?" Uzumaki Ashina gently stroked the Sealing Jutsu array covered with ancient runes, a hint of knowing a veteran's smile in his eyes. However, the truth was far more complex than it appeared. This seemingly heaven-defying space actually concealed a subtle "time correction law."
The core of this set of laws lies in the unique operating mechanism of the spacetime Sealing Jutsu array. The moment the caster steps into the Setsuna Splendor Space, the array locks the starting time point, and when the caster leaves, time will precisely rewind to the moment before entry. This is like pressing the pause button. No matter how many centuries have passed in the space or how many times one has cultivated, when one comes out, the body, objects, and even the surrounding environment will not leave any trace of time.
To give a vivid example, if you enter the space with a blank notebook and a fountain pen, even if you spend a hundred years filling the notebook, the Setsuna you step out, the paper will return to its blank state, and the fountain pen will be refilled with ink. If you enter as a youth, you will experience the vicissitudes of life within the space and become an old man with white hair, but upon returning to reality, you will return to your original youthful appearance. The only proof of this special experience is the memory etched deep in your soul; the accumulation of that knowledge will transform into a unique treasure.
When asked about the original intention behind the invention of the space, Ashina solemnly said, "It is the crystallization of wisdom created by our ancestors to pass on knowledge and break through the bottleneck of cultivation." In the ninja world, the accumulation of knowledge and the improvement of skills are often limited by lifespan and time, but the Setsuna Splendor Space breaks through this constraint, allowing ninjas to learn advanced knowledge in a relatively safe environment with almost unlimited time.
"Time acceleration is a double-edged sword." Uzumaki Ashina brought up a diagram of the internal structure of the space, with a dark red warning area flashing at the core. "If you forcibly mobilize Chakra inside, the energy fluctuations will cause spacetime tremors. A clansman once tried it, and as a result, a crack appeared in his own timeline, almost turning him into a fragment in the time turbulence."
When they finally arrived at the entrance to the space, Tsubasa held his breath. It was a stone wall covered with liquid runes, the flowing symbols seemingly alive, devouring light. Uzumaki Ashina placed his hand on the wall, and the runes suddenly formed a band that enveloped Tsubasa, scanning Tsubasa bio-signature. "Remember, each entry cannot exceed 100 internal days, otherwise irreversible time erosion will occur to your body."
The moment Tsubasa stepped into the space, he felt as if he had been swept into a vortex of time. The surrounding darkness was thick as ink, with only two luminous pearls emitting an eerie blue light. The ground was a metal plate covered with time markings, each marking recording the time imprint of different users. He couldn't wait to unfold " Detailed Explanation of Multidimensional Sealing Matrices," and with ample time, he learned, memorized, and understood those formulas that were once difficult to understand.
As he delved deeper into his reading, Tsubasa became completely immersed in the world of Sealing Jutsu. He forgot his hunger and fatigue, his eyes fixed only on the constantly deconstructing and reassembling runes. When he attempted to use his newly acquired knowledge to improve a Space Sealing, the entire space suddenly trembled violently, and the light from the luminous pearl turned a dangerous blood red.
"Stop!" Yueqing's exclamation pulled him back to reality. The girl's red hair danced wildly in the temporal turbulence. She quickly drew soothing runes, "You just triggered the runes of the laws of spacetime! To innovate in a place like this is practically going against time itself!"
Tsubasa wiped the cold sweat from his forehead, but a smile of excitement appeared on his face. This magical space was not only a treasure trove of knowledge, but also an excellent place to create new rune theories. He knew that he had stepped into a completely new dimension on the path of Sealing Jutsu. And deep within the folds of time, countless unknown mysteries awaited his exploration.