The next day, in the Black Corrosion Hell.
The underground prison, though not completely devoid of light, made it nearly impossible to distinguish between day and night.
However, Shigure devoted himself entirely to the training of his Resonance Eye.
From initially being able to sustain it for only a few dozen seconds, he had now reached a duration of ten minutes—a qualitative leap.
But this was still far from enough.
Since he pursued the path of ultimate strength, Shigure naturally aimed to do his best.
Thus, he began attempting more challenging training methods.
He expanded the field of vision of the Resonance Eye tenfold to encompass the entire prison.
Since this wasn't a spiritual pressure-based ability, Sugisa couldn't detect it either.
Expanding the scope of detection brought significantly greater pressure. As a result, his full activation time was reduced to around two minutes.
"It seems... I still need continuous adaptation and training," he muttered.
On the third day, Shigure managed to take a short nap.
When he woke up, he was surprised to find Sugisa standing before him, wearing an odd expression.
Sitting up, Shigure asked in confusion, "What's the matter, Mr. Sugi?"
Crouching down, Sugisa looked at him and said, "You're truly a mystery... your secrets just keep piling up."
Keeping his expression calm, Shigure replied indifferently, "What are you talking about?"
Laughing lightly, Sugisa said, "Haven't you noticed any changes in your body?"
"Changes?"
Shigure was slightly taken aback. Immersed in his training for the past two days, he hadn't paid much attention to his physical condition.
Grinning, Sugisa said, "You're really enviable… When I first arrived here, it took me fifty years to gradually integrate with the distorted spiritual pressure of this place."
"But you, kid… you've already completely fused with it."
As his words sank in, Shigure's eyes flickered. Without hesitation, he subtly activated his Resonance Eye to examine himself.
What he saw indeed surprised him.
Not long ago, the twisted spiritual pressure aggregates were still being blocked by his own spiritual pressure.
But now, there was no barrier between the two.
Seeing his expression, Sugisa assumed he was in disbelief and chuckled, "Why don't you disperse the spiritual pressure covering your body and see what happens?"
Nodding slightly, Shigure withdrew the spiritual pressure layer enveloping him.
Sure enough, he felt no discomfort at all!
When he first entered this place with Zaraki Genjirou, he would feel uneasy without covering himself in spiritual pressure.
But now, there was no such sensation.
Noticing his expression, Sugisa stood up, laughing as he turned to leave.
"It seems Seireitei is about to witness the rise of a monster-level existence."
As Sugisa walked away, Shigure began to understand the reason.
There was only one explanation for his rapid fusion with the spiritual pressure here—his Final Soul!
Previously, in Aizen's captain's chamber, he had received the Soul Source as a reward from the system.
After merging with his soul, the Soul Source had fundamentally altered his soul's attributes, transforming it into the powerful Final Soul, capable of harmonizing with all forms of power in existence!
These twisted spiritual pressures might appear intimidating, but in essence, they were still just spiritual pressure.
Their discomfort stemmed from their unique rules and forms, differing from ordinary Soul Reaper spiritual pressure.
However, thanks to the Final Soul, Shigure could swiftly integrate this power.
Ordinary Soul Reapers, like Sugisa, required prolonged adaptation due to the barriers of their soul.
"What an immediate and remarkable effect..." Shigure smiled.
He had been wondering how to test the Final Soul. Unexpectedly, this place had inadvertently provided the perfect opportunity.
After calming his mind, Shigure stood up.
Though his nap had been brief, it was enough to restore his energy.
Now, it was time to continue training his Resonance Eye.
But just as he activated his Resonance Vision, a sudden notification echoed in his mind.
"Ding! A new Sign-In Task has been issued!"
Hearing this, Shigure felt a jolt of surprise.
So soon?
Moreover, he was still confined in the prison.
While he pondered, the system announced the task:
"Current Task: Proceed to the fifth level of the underground prison, the 'Pit of Abyss,' and sign in!"
"Time Limit: Three days."
"Complete the sign-in within the stipulated time to receive system rewards!"
As the system's voice faded, Shigure was momentarily stunned.
A time limit?
Three days?!
Are you kidding me?!
I'm still trapped in Black Corrosion Hell...
Although the sign-in location was just two levels below, it wasn't far in terms of distance.
But reaching it easily was a challenge for Shigure in his current state.
The seals of Black Corrosion Hell weren't particularly strong.
When he first arrived, Shigure had sensed that he could break through them with a partial release of Candle Dragon and a slight increase in spiritual pressure.
However, he couldn't afford to do so.
The underground prison was directly under the jurisdiction of the Central 46.
Destroying its seals would undoubtedly be seen as a declaration of war.
In that case, the so-called "loyalty" test would become meaningless.
The entire Gotei 13 would likely unite against him.
Though Shigure was already quite powerful, he wasn't blindly confident.
Nor was he arrogant enough to believe he could take on the entire Gotei 13 alone.
"But... this makes things rather troublesome," he muttered, furrowing his brows.
The sign-in task was mandatory.
Yet it also needed to be completed in the most appropriate manner.
~~~~❃❃~~~~~~~~❃❃~~~~
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