With Kuramitsuha's guidance.
Natsume's understanding of the soul grew increasingly profound.
Looking back now, the soul-based alternate space—the [Pure Land World]—that the Sage of Six Paths had created in the [Ninja World] was indeed extraordinary.
It could even allow souls that entered the Pure Land World to retain a certain degree of thought and learning ability.
Just as the Fourth Hokage Minato had continued mastering [Sage Mode] and [Nine-Tails Mode] within the Pure Land World.
And just as the previous generations of Five Kage had mastered the Super Interdimensional Summoning Technique taught by the Sage of Six Paths.
For a lifeform from the main universe to have researched souls to such a degree—
That was truly remarkable.
It was practically equivalent to single-handedly creating half an [Underworld World]...
Natsume guessed—
The Sage of Six Paths himself had likely been somewhat concerned about the Otsutsuki Clan, the "great enemy" Kaguya had mentioned.
That was why he had spared no effort in building the [Pure Land World], wasn't it?
But limited by his own strength and perspective—
The [Pure Land World] was indeed incomplete, with quite a few flaws.
At the very least—
It heavily suppressed a person's spiritual essence, or rather, it could not preserve the integrity of that spiritual essence.
That was what greatly stifled the creativity of dead ninja.
Otherwise—
With someone as gifted as Tobirama—
After several decades in the [Pure Land World], he should have already devised several hundred new ninjutsu specifically to counter the Uchiha...
It was clear—
Just how important the creativity represented by spiritual essence was.
Without it—
No matter how much time or effort was invested—
The [Ninja World] could never break through its limits, much less contend with the [Otsutsuki Clan]...
"No wonder most of the Yellow Spring Lineage's secret techniques