"The Holy Grail of the Netherworld…"
Tsuna opened the record book, his mind gathering every bit of information about the Holy Grail. On one of its pages, the image of a chalice made entirely of pure gold appeared, categorized under Armaments.
"That Grail truly does possess the power to twist life and death—but that power doesn't come merely from controlling life itself. It comes from reversing causality. By overturning cause and effect, it can bring the dead back to life."
"Moreover, in Japanese tales, the word 'Netherworld' symbolizes Yomi—the land of the dead—and also represents dimensions beyond our own."
"The combination of these two words, literally speaking, means the key to the underworld."
"That certainly fits its ability to reverse causality and alter the state between life and death."
"Yomi… the home of the dead. To leave it, one must open its gates. Thinking of it that way makes perfect sense."
He deconstructed the meaning of the Holy Grail of the Netherworld word by word, recording his analysis onto the record book.
If a concept was sound, the book would accept it—preserving it as a construct he could summon freely in the future.
If not, the blueprint simply wouldn't imprint onto its pages.
Simpler creatures—those with single abilities—didn't need such logical consistency. Their functions didn't conflict the way complex constructs did.
Only creations with intertwined powers required coherent internal logic.
That was why Tsuna had always hesitated to design overly complicated magic beasts—once complexity increased, the risk of collapse skyrocketed.
Just like when he had created Silence, the Level 7 construct—it had collapsed upon formation.
It wasn't just a problem of imagination, but of inner design—bugs within the structure that caused its framework to fall apart.
Ultimately, the problem always came back to imagination.
"Got it!"
Tsuna's face lit up as he saw the golden Grail image etched onto the book's pages. Beneath it, neat annotations described its abilities:
"Interference with space and dimensional planes, interference with established causality, storage of life energy and soul fragments~."
"Its functions include manipulation of space, life, and cause—enabling the reversal of life, causality, and space."
"Wait… if the Holy Grail of the Netherworld can interfere with space, could it help me sense spatial coordinates?"
The thought struck him like lightning.
If the Grail could indeed influence dimensions, then perhaps it could enhance his perception of spatial anchors—the coordinates linking worlds.
Without hesitation, Tsuna moved to test it.
As long as he didn't use the Grail to resurrect the dead, there was no ethical dilemma to worry about.
And naturally, he wasn't the type to make things difficult for himself.
A chalice of pure gold appeared before him—elegant and radiant, its form like a wine cup.
He reached out and grasped it lightly. As he tilted it, a crimson liquid slowly welled up inside.
"Life energy…?"
That would require further study later. For now, the key question was whether the Grail could help him sense spatial coordinates.
Tsuna closed his eyes, focusing on the coordinates of another world far away.
At that very moment, the Grail in his hand began to glow faintly.
Within his perception, the once-hazy spatial coordinates grew sharper and clearer.
He opened his eyes in shock.
"It really works!"
Before, his strength had been too low—he could barely feel the coordinates, only a vague sense of direction pointing toward them.
But now, it was completely different.
This time, he could pinpoint them with absolute precision—no longer hazy or unstable, but crystal clear.
"Perfectly clear… perfectly stable."
The discovery filled him with indescribable joy.
It meant that, at last, he had found a definite coordinate—a clear point that represented home.
"The spatial interference ability is incredible."
"The Grail works like an amplified signal receiver—it strengthens my perception of the coordinates and stabilizes the connection."
"This ability is a massive help."
With clear and steady perception, he could now forcefully connect if needed.
But he took a deep breath and calmed himself.
"Stay calm. My perception is only stable because of the Grail's support."
Soon, his excitement subsided.
It wasn't time to return yet. As long as he had confirmed the coordinates and verified that time in that world remained frozen from when he left, there was no need for impatience.
"I'll finish this Joint Expedition first. Once I reach Level 3, I'll think about returning."
Everything had its proper order.
The Joint Expedition had been in preparation for quite some time—it was the next major milestone.
Tsuna also intended to use this expedition to break through and reach Level 3.
As his strength grew, so too would the stability of his spatial sense.
When the time came to return home, being stronger could only help.
As for what came after—he didn't bother thinking about it yet.
There would be countless matters to confirm once he went back, and none of them could be planned out in such a short time anyway.
Still, there were a few preparations he could handle before then.
For example, he needed to create a magic beast that could perform digital infiltration—or more accurately, build a magic beast computer that could hack networks for him.
In a world dominated by modern technology, most information could be obtained through intrusion.
Mafia records, hidden data, secret archives—if Tsuna wanted to locate the stones that could ignite Dying Will Flames without revealing his identity, he needed a proper intelligence-gathering system.
With that decision made, Tsuna dismissed the Grail from his hand and turned to the next page of the book.
"Perfect timing. Since I've got free time today, I'll make a magic beast specialized for electronic information capture."
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You can read up to chapter 235 on patreon.com/NiaXD.