It was obvious that the sealing formula in the depths of Muken was connected in some way to the one in Hell.
When the sealing formula in Hell absorbed Hell's spirit particles, they would overflow on this side.
Furthermore, Sora saw the Hell aura being washed away from the spirit particles, converting them into blue spirit particles.
These blue particles converged on the base of the sealing formula and were then stored in a dense network of spiritual veins.
The walls of this space were covered in these veins.
"Spirit particles containing Hell's aura are being converted into normal spirit particles here..." Sora's eyes narrowed.
Saitō Furōfushi, who was communicating with her grandmother through the large shell, was also shocked by the immense amount of spirit particles contained in the veins.
"If the spirit particles gathered here were used to fire a Kidō Cannon, it could probably destroy the entire Seireitei!" she exclaimed.
The 'Kidō Cannon' she spoke of was a large-scale Tenzen Heisō of the Kidō Corps, requiring many Shinigami skilled in Kidō to operate.
"If I'm not mistaken, the seal on Hell's side is connected to this one. These spirit particles are likely used to maintain the sealing formula," Sora said.
The seal in Hell broke down everything sucked into the vortex into spirit particles. These particles, containing Hell's aura, were transmitted here, stripped of that aura, converted into normal spirit particles, and stored in the veins.
Any spell formula requires spirit particles for long-term maintenance.
This sealing formula relied on the spirit particles stored in the veins to continue operating.
"The stripped Hell aura has gathered to form an orb," Sora said, noticing a dark red orb on the pedestal beneath the ball of light.
The pure Hell aura, stripped from the spirit particles, coalesced into "Hell's Luster" and was absorbed by the dark red orb.
Hell's Luster was the product of a high concentration of Hell's aura gathering together, making it visible to the naked eye.
This floating Luster could also be seen during a Konsō Reisai or when the Gates of Hell opened.
Hell's Luster has a strong attraction to spirit particles. When it comes into contact with them in the atmosphere, it easily converts them into particles containing Hell's aura. Therefore, it's difficult for Hell's Luster to exist for long in the three realms.
But in this space, not only could it exist for a long time, but it had even condensed into an orb.
This was because all the spirit particles floating in the air here contained Hell's aura; the normal ones were all sucked into the veins by the seal's base.
Not counting the spirit particles stored in the veins, once the sealing formula converted all of Hell's spirit particles into normal ones, this space was essentially a spirit particle vacuum.
The seal's base had an extremely strong attraction to spirit particles. Even the trace amounts naturally released by Sora and Furōfushi's breathing were sucked away.
Saitō Seiko's voice came from the large shell: "An orb formed from condensed Hell's Luster? I never thought you'd see something like that in the Soul Society. Such things are rare even in Hell... We usually call it a Hell's Luster Orb. Even here, you can only find them in places with the highest concentration of Hell's aura. If one appeared in Hell, it would probably attract many evil dwellers to fight over it."
Sora asked curiously, "It would cause a fight? What does it do?"
Saitō Seiko explained, "Those who have fallen into Hell will not truly die until their consciousness has been assimilated by Hell."
"Even if their spiritual body is destroyed, they have a chance to be reborn."
"The key to this is Hell's Luster."
"If a spiritual body is destroyed, Hell's Luster will gather spirit particles to repair it. However, the small amount of Luster floating in Hell's atmosphere is not enough to repair it quickly. The process is quite long."
"But it's a different story if you have a Hell's Luster Orb. The high concentration of Hell's Luster within it can repair a damaged spiritual body almost instantly."
Sora understood. For the people of Hell, the orb was a resurrection coin.
He remembered that after Yamamoto defeated Takezuna Jigyō, who had returned from Hell, Takezuna had said that even if Yamamoto killed him, he would not perish, but simply return to Hell.
It seemed that after Takezuna's consciousness and spirit particles returned to Hell, Hell's Luster would slowly repair his spiritual body.
Sora continued to ask, "Then is the Hell's Luster Orb useless for spiritual bodies from the three realms?"
Saitō Seiko said, "Not completely useless. Hell's Luster has an extremely strong attraction to spirit particles."
"The small amount that drifts out during a Konsō Reisai or when the Gates of Hell open is one thing."
"But a Hell's Luster Orb is made of a high concentration. If the Luster contained within it were released, the massive amount could even pull the spirit particles out of a spiritual body, causing considerable damage."
"You could use it as a trump card."
"Sounds pretty good... using its strong attraction to normal spirit particles to pull them from a spiritual body. If there's enough Luster, it could even cause the body to collapse," Sora mused. "But how do I take it? If I touch it, won't my own spirit particles be sucked out?"
"Do you have any Sekkiseki?" Seiko asked. "Sekkiseki can isolate spirit particles. A container made from it could naturally hold the orb without the Luster being able to absorb anything."
Sora had a whole vein of Sekkiseki and had stored quite a lot. He took out a piece.
Sekkiseki has the property of isolating spirit particles, but its hardness is not very high. A moment later, he had fashioned a small square box with his tools.
Sora used the box to store the Hell's Luster Orb.
Not only had this trip uncovered some secrets about the Soul Society and Hell, but he had also obtained a Hell's Luster Orb. Sora was quite satisfied.
This orb had been absorbing the Hell aura produced by the seal in Muken for many years, so its concentration was extremely high. If the Luster inside were released, it's likely that not even a captain-class powerhouse could withstand it.
The sealing formula here was too complex for Sora to decipher with his current knowledge of Kidō. Even if he could break it with brute force, he wouldn't dare to do so lightly.
His intuition told him that forcibly breaking this seal would lead to severe consequences.
Whatever was sealed by this formula that operated across two worlds was certainly not simple. Sora guessed that the eyeball was very likely a remnant of the Lord of Hell who was defeated by the Soul King.
The Soul King had now become the lynchpin maintaining the stability of the three realms. If breaking the seal led to the premature revival of the Lord of Hell, the three realms might not be able to handle such a crisis.
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