Igarashi froze for a moment at those words.
After all, since retiring, he had not taken part in Xia Xi and Shinjuro's discussion at the Swordsmith Village.
Naturally, he knew nothing about Kokushibo.
But he could still understand what Xia Xi meant.
Humans struggled to master such techniques, but what about demons?
Mastering the [Bright Red Nichirin Blade] required an extremely high [Body] stat.
The threshold for mastering [Transparency] certainly could not be low, either.
The vast majority of human swordsmen struggled to attain physiques comparable to those of the Upper Ranks.
Thus, most swordsmen in the Demon Slayer Corps probably could not meet the threshold for supreme territories such as the [Grip of Ten Thousand Jun] or the [Transparent World].
But demons were different.
What they lacked least was time and powerful physical fitness.
As Xia Xi explained more about Upper Rank One, Kokushibo's background...
The elder brother of the strongest swordsman, Yoriichi Tsugikuni.
A traitor among the Nine Hashira who had murdered the family head of his time.
The leader of the Twelve Kizuki, who had lived for centuries.
Igarashi and Kazami beside him gradually grew solemn.
If he really had mastered these two legendary techniques, and even intended to spread them among the demons...
The consequences would be unimaginable.
Then they saw Xia Xi wave a hand.
"Upper Rank One is formidable, sure, but as for spreading these techniques... there's no need to worry about that."
Although the Bright Red Nichirin Blade had the highest requirement for the physique stat,
that did not mean its requirements for [Technique] and [Mind] were low.
Each needed to reach at least 100 points.
Even allowing for variations between individuals...
Those were still stats on the level of the Nine Hashira, at the very least.
On top of that, demons as