Within a space of the [Black Domain Buddhakṣetra], shimmering with crystalline Buddha-light, sacred Brahmanic chants echoed from time to time.
In this special realm, there were no boundaries, nor any concept of time or space. As far as the eye could see, there were only twisted Sanskrit characters and streams of glasslike radiance stretching endlessly into infinity. Vast power blanketed every corner of this domain, and from time to time, black annihilation lightning and black mandala flowers flashed into existence before vanishing again.
In the midst of this boundless expanse, only a single peerlessly beautiful girl sat upon the central lotus throne. Within her golden eyes, nebulae were born and extinguished without cease.
Her hands were held level at her sides. Upon her pale palms hovered two spheres of light representing different authorities, like miniature galaxies condensed into radiant clusters.
Behind the girl loomed the enormous phantom of the Demon Buddha Māra. Around its body coiled the immense nebular power obtained under Sage Mode · Candle Dragon.
Although the colossal three-headed, six-armed Demon Buddha phantom made no movement at all, its mere existence radiated a pressure as deep as an abyss. Not to mention the Wheel of Vipralopa suspended behind its head, which continuously emitted the power of Vipralopa outward.
...
It had been nearly three months since Satsuki completed the Shikon Jewel and entered this separate dimension.
To use the True Fire of Samadhi in conjunction with the Yasakani no Magatama to fuse laws was no easy matter for Satsuki. The first step was to strip the authority of the laws from the Sacred Wheel itself.
The Three Divine Kings' Sacred Wheel was a special Noble Phantasm prepared for her by Gaia's consciousness during her time in the Fate world. Its essence was the crystallization of the laws of the Three Kings.
Therefore, separating the authority from it was not a simple task. To accomplish this without damaging the Sacred Wheel, Satsuki had spent an enormous amount of time before finally extracting the two powers of [Instant Death] and [Perpetuity].
These were the targets she had chosen for experimentation—compared to [Status Manipulation] and [Energy Control], the authority of [Instant Death] was relatively more replaceable among the Three Kings' laws.
If any unforeseen anomaly occurred during the fusion process, leading to failure, her losses would not be too severe.
Rationality had always dominated Satsuki's thinking. Even at such a crucial moment, she did not lose her judgment.
At this very instant, her attention condensed inward. Her silk-like black hair fluttered behind her head, and the ruby on her forehead shone brilliantly within this space.
Then, a cluster of True Fire of Samadhi was recreated by her through the authorities of Energy Control and Status Manipulation.
Next, from within Satsuki's sleeve, an ancient jade stone floated out and quietly hovered above the True Fire of Samadhi, spinning slowly within it.
This step was critical. Whether the True Fire of Samadhi could activate the Yasakani no Magatama depended on Satsuki's perception of the magatama's changes and her control over the intensity of the fire.
Fortunately, with her Three Thousand Insightful Eyes, she could meticulously observe every transformation within the Yasakani no Magatama. Moreover, her mastery over energy had long since reached the pinnacle. Thus, this step was not difficult for her.
...
As the True Fire of Samadhi heated it, the surface of the Yasakani no Magatama gradually began to change.
Originally, this divine artifact had appeared no different from an ordinary jade stone. But as the power within it was activated, its surface began to undergo transformation.
A layer of dullness upon its shell was dispelled by the flames, becoming smooth and lustrous. Its color gradually deepened, shifting from pale green to dark emerald, and finally showing faint signs of turning toward violet.
The change in color was only one aspect. As the True Fire of Samadhi continued to burn, the divine power within the Yasakani no Magatama was finally awakened. The divine power representing [Fusion] manifested as a ribbon of light coiling around its surface.
"It is time."
The thought arose.
Satsuki guided the authority spheres in her hands to float to either side of the Yasakani no Magatama. Then, they began to rotate around the activated magatama. The fusion of authority was not like kneading dough—adding water when there was too much flour, adding flour when there was too much water. She had to observe every subtle fluctuation in the authority spheres to determine whether they should draw nearer or keep their distance.
The process consumed immense mental strength. However, Satsuki had long grown accustomed to focusing intently on experiments back in the Naruto world, so she made no mistakes.
Moreover, the Yasakani no Magatama truly lived up to its title as the [Supreme Divine Artifact] of the Shinto circle. Once activated, its effects were relatively gentle and not difficult to control.
"At this rate, fusing the authorities of [Instant Death] and [Perpetuity] will not take long."
Satsuki watched as the authority spheres slowly approached the magatama. Within her Three Thousand Insightful Eyes, she could see the Yasakani no Magatama drawing out a slender thread from each sphere of authority. Using itself as the center, it began to rotate and intertwine them, merging the two into one.
As the magatama awakened further, the speed of this fusion visibly accelerated.
Having lost all reference points, Satsuki could no longer perceive the passage of time. She did not know how long had passed within this place.
Finally, at a certain moment, divine light flashed through her eyes.
The two spheres of authority representing [Instant Death] and [Perpetuity] had completely vanished. In their place, surrounding the Yasakani no Magatama, was an even more resplendent and intricate nebular sphere of authority.
It represented a specialized combat authority even more terrifying than [Instant Death]—the fusion product of the [Instant Death] and [Perpetuity] authorities.
[Super Instant Death].
It was the very power that the Wheel Yama King had once nearly used to kill Satsuki in a single strike.
Here, it is necessary to explain the difference between Instant Death and Super Instant Death.
The authority of [Instant Death] is a straightforward concept. It can be understood as "immediate death"—a form of instant kill. In the Fate world, the Demon God King Goetia's Noble Phantasm "Ars Almadel Salomonis" and the death spokesperson Hassan-i Sabbah's Noble Phantasm "Azrael" both carried similar powers—either dealing overwhelming damage in an instant or directly imposing the concept of death upon the opponent.
However, if a target possesses resistance to [Instant Death], or abilities similar to Hassan-i Sabbah's "Battle Continuation," they can more or less withstand a pure [Instant Death] attack.
For such targets, [Super Instant Death] becomes useful.
As long as one lands a hit upon the opponent in battle, [Super Instant Death] can seize the target's state, filling in the concept of [Death] for existences that originally lack it. Moreover, because it contains the authority of Perpetuity, even after the attack itself dissipates, the acquired state does not disappear. It remains permanently.
Under such circumstances, if one then uses an Instant Death method to strike the opponent again, the target will remain in a constant state of "being instantly killed."
Although the final result appears similar to Instant Death, the process is entirely different.
Perhaps that explanation is still somewhat difficult to grasp.
To put it simply: Instant Death kills the target once.
Super Instant Death makes the opponent keep dying—forever.
The fusion of authorities proceeded without disturbance within the Black Domain Buddhakṣetra. Although [Super Instant Death] was an immensely powerful ability, its birth did not cause much upheaval.
At this moment, the law of authority known as [Super Instant Death] before Satsuki had completely condensed into a nebular sphere about the size of her fist, pulsing like a living heart.
Behind her, the Demon Buddha Māra opened all three pairs of eyes, staring at the throbbing sphere of [Super Instant Death] with an eerie gaze.
When both light clusters had been fully guided and absorbed, the Yasakani no Magatama finally completed its task and vanished.
At the instant the authority of [Super Instant Death] took form, an unparalleled pressure and killing intent spread outward across the entire Black Domain Buddhakṣetra.
At the very center of that domain, Satsuki once again felt a familiar sensation—the same feeling she had experienced in the YGGDRASIL world when the Wheel Yama King had pointed his spear at her forehead.
However, unlike that time when she had been the target, now she was merely brushed by the wavelength emitted unconsciously by the [Super Instant Death] sphere, passively acquiring its state without any follow-up attack.
"What a spine-chilling ability."
Satsuki gazed into the interior of the sphere. Within the pulsating light, countless spiritual sparks flowed according to some intricate law. Divine radiance flickered like a supercomputer performing calculations at extreme speed.
With the formation of the Super Instant Death authority complete, the next step was how to obtain it.
The fused [Super Instant Death] authority possessed overwhelming intensity. For Satsuki, direct absorption was impossible—she first had to break apart its current stable structure.
For that, she relied upon the true body of the Demon Buddha behind her.
The three mouths of Demon Buddha Māra chanted simultaneously, "Boundless Wave Answer."
At the same time, the Wheel of Vipralopa burst forth with immense Vipralopa power, shining down upon Satsuki's right hand.
Nine violet Vipralopa Truth-Seeking Orbs manifested at once, assembling in her grasp into a purple blade of light that radiated terrifying might.
[Vipralopa · Golden Wheel Reincarnation Explosion].
Then, facing the sphere of [Super Instant Death] authority ahead, she slashed down with the violet blade.
—Crack!
A sound rang throughout the Black Domain Buddhakṣetra—silent, yet like the heavens collapsing.
The entire interior of the Black Domain Buddhakṣetra immediately began to implode and disintegrate as though the sky itself had overturned. The source of the collapse was the newly fused [Super Instant Death] sphere. It shattered within the domain, then rapidly contracted into a singular point—only to expand outward violently like a cosmic explosion.
At that moment, Satsuki raised the Sacred Wheel high and began guiding the power of [Super Instant Death] back into the position of the red gemstone upon it.
With a single thought, the space around her wrist suddenly collapsed into something like a miniature black hole. An invisible gravitational force spread in all directions—above, below, and across the void. The expanding [Super Instant Death] authority was irresistibly dragged inward at tremendous speed.
From every direction, countless nebular streams linked together into a vast torrent, surging like an enraged tide and pouring directly into the Sacred Wheel in her hand.
At the same time, the ruby on Satsuki's forehead emitted innumerable Dead Lines, beginning to reweave the Black Domain Buddhakṣetra, which had been left resonating and unstable by her previous strike.
The surrounding space of the Black Domain Buddhakṣetra converged inward toward Satsuki's palm. In the end, the entire domain vanished, replaced by the interior of the Lunar Palace.
"At last... it is complete."
The thought flickered through Satsuki's mind. She lifted her wrist and examined the Sacred Wheel once more. Outwardly, there was no dramatic change—the only difference was that the red gemstone, which had once represented the authority of [Instant Death], had now transformed into a higher-order authority.
"Host, has the authority fusion succeeded?"
At the instant the Black Domain Buddhakṣetra dissolved, the system's sphere of light manifested beside her.
"Yes." Satsuki lowered her arm. The phantom of the Demon Buddha behind her faded along with the disappearance of the Buddhakṣetra. "We can now enter that so-called Divine Arena."
—"Understood."
At the system's command, a massive distorted vortex suddenly formed above the Lunar Palace. A vast, invisible force coiled out of the void, gradually revealing its shape.
A black sphere wrapped in blue lightning and fortune—[Swirl of the Root].
At its center, what should have been utter darkness suddenly split open with a fissure, releasing an immense suction force toward Satsuki below.
She did not resist the pull, instead allowing herself to rise upward along with it.
At that very moment, outside the Lunar Palace, the figures of the Great Brahma King, the Wheel Yama King, and the Phantom Spirit King suddenly appeared. They gazed toward Satsuki as she ascended toward the Swirl of the Root—and knelt upon one knee.
"We respectfully send off our Lord. May our Lord return in triumph!" *3
Satsuki gave a slight nod in the direction of the Three Kings. Then her body transformed into a streak of light and entered directly into the Swirl of the Root.
Rumble—
As her figure vanished, the Swirl of the Root disappeared at the same instant...