"…I see. I didn't expect such a power to exist."
Kaguya's tone carried both understanding and surprise.
She already knew Tsuna had been giving the Amazon sisters a bit of special training. After all, the three were close in age and often spent time together—it wasn't strange at all.
What she hadn't expected was that Tsuna had essentially given them a form of magic that required no incantation.
That realization made Kaguya more serious—and far more interested.
She understood perfectly well how much a power comparable to magic could raise both personal and overall strength.
Which meant that this time, she had every reason to press for it.
"Tsuna, what do we need to give in return to gain this power? If it's that idiot elf, I think we can manage that!"
Kaguya said it without hesitation, casually selling out her own party member, Ryuu.
"Hey, didn't you just say we shouldn't tease Ryuu?"
"That was a moment ago. She's not here right now."
"Oh, come on! If she finds out you sold her out, she'll cry for sure!"
Watching the two of them banter like a comedy duo, Tsuna couldn't help but laugh. He waved a hand.
"There's no need for any price. And as for that elf you mentioned, forget it. She can't do anything besides fighting, can she? If I actually brought her here, she'd just cause me more trouble."
"…"
So even the 'useless elf' reputation has spread this far?
Both Alise and Kaguya silently made the same remark in their minds.
"I never planned to hide this power," Tsuna continued, "but I also don't intend to announce it within the Familia just yet."
"Why's that?"
"It's simple. Low-level Adventurers don't have the spare energy to focus on anything beyond improving their basic skills and abilities. If their attention gets scattered, their growth will only slow down. Besides, the source of this power lies in one's resolve. Without a strong heart, this power can't even be awakened."
"It's connected to one's heart?"
Kaguya was beginning to understand why Tsuna didn't want to spread it too widely. If that was the case, then indeed—this kind of power wasn't something low-level Adventurers should handle.
"Low-level Adventurers need to first build a proper foundation," Tsuna said. "While gaining strength, they should use that process to fortify their resolve. Once they've reached a certain point, mastering this power will be far easier."
He nodded slightly.
"Miss Gojouno, you should understand this. In the Labyrinth City, low-level Adventurers make up the majority. Only a small portion ever rise above the lowest ranks. But many of them lose the will to become stronger—they just drift along."
"Even the Loki Familia, the second-largest Familia in the Labyrinth City, has plenty of low-level members. And right now, they've crossed their hurdles not through their own efforts, but through mine. That means they still don't have the right mindset."
Kaguya understood his point immediately.
Adventurers who overcame challenges on their own gained an inner resilience—that, in itself, was the condition needed to wield such a power.
Those who advanced only with external help lacked that same fortitude.
So this power isn't without its limits after all.
But she could accept that. It was like how an Adventurer needed courage to challenge stronger monsters in pursuit of greater strength.
Without a strong and unyielding heart, they could never find the resolve to risk their lives against tougher foes.
Only those who took that step forward had the right to gain greater power.
Just like the power Tsuna possessed.
"Hmm… as for this ability," Tsuna said after a pause, "I might need to explain it to a few more people, not just the two of you."
"Huh?"
Both women blinked in confusion.
A moment later, there was another knock on the door.
Knock, knock, knock.
Tsuna opened it as he had before, while Kaguya and Alise instinctively craned their necks to peek outside.
Standing in the hallway were two familiar figures—Riveria and Ais.
"!"
The two women at the door also froze when they saw who was inside.
"Ah… did we interrupt something?" Riveria asked carefully.
She hadn't expected to find both Kaguya and Alise visiting Tsuna's room this late at night.
"It's not really an interruption," Tsuna said with a small smile. "Actually, I'd meant to visit you earlier, Riveria, but I've been spending a lot of time with Lady Hephaestus lately. Both she and Tsubaki have been researching new forging methods, so I haven't had the chance."
"Anyway, since you're all here for the same thing, I won't need to explain twice. Come in."
Tsuna didn't mind at all. Since their goals overlapped, discussing everything together would only save time.
Riveria entered with Ais in tow and gave a polite bow to Alise and Kaguya. The gesture made both of them stand at once.
"Alise, Kaguya—thank you for having us."
"You're not the ones intruding," Kaguya replied quickly. "If anything, we're the ones who came uninvited."
It wasn't false modesty—it was the truth.
Tsuna was a member of the Loki Familia, and technically, it was she and Alise who were the outsiders here.
The small room was now filled with key members from both the Loki and Astraea Familias, and though it felt a bit cramped, that didn't stop everyone from listening attentively as Tsuna began his explanation.
Riveria and Ais soon heard his reasoning about why he hadn't yet spread this power more widely.
"I agree," Riveria said softly when he finished.
"The use of such power requires a steadfast heart. Without it, a strength born from the soul could become a burden rather than a blessing."
"Only those who have crossed their hardest trials and found true resolve as Adventurers are ready to handle it, Tsuna."
Riveria looked at him with quiet approval. She respected this diligent, self-driven boy—someone who had clearly earned the right to wield that power.
Still, there was one thing that piqued her curiosity.
"But tell me… why were Finn and Gareth the first to master it?"
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You can read up to chapter 215 on patreon.com/NiaXD.