In Tsunade's original timeline,
when Naruto was training in Mount Myoboku's Sage Mode, the tsundere Nine-Tails would constantly undermine him.
The reason was simple: the Nine-Tails looked down on those toads and did not want to be anywhere near them.
Besides, it believed that with Nine-Tails Chakra in his body, Naruto had no need to learn Mount Myoboku's lousy Sage Mode.
That was why, before fighting Obito, Nine-Tails Chakra Mode and Sage Mode had never been usable together.
But the Nine-Tails of this time had long since lost that tsundere attitude.
It discovered that Katsuyu's terrifying Senjutsu Chakra was not merely no weaker than its own—it was far stronger.
Even Gamamaru had dared scheme against Ten-Tails-possessed Kaguya Ōtsutsuki, let alone Katsuyu, who was even more formidable than Gamamaru.
The Nine-Tails realized with humiliation that Shikkotsu Forest's natural energy inherently suppressed Tailed Beast Chakra.
It finally remembered the feeling of Hashirama Senju patting its head back then.
What had suppressed it had not merely been Wood Release, but Yang Release Chakra combined with that scalp-tingling natural energy.
Back when Hagoromo Ōtsutsuki fought Kaguya Ōtsutsuki, he had specifically sought out Gamamaru to learn how to use natural energy. But Shikkotsu Forest's natural energy suppressed Tailed Beast Chakra far more viciously than Mount Myoboku's methods.
Naruto's eyes were bloodshot as he roared hoarsely at Katsuyu.
"Can't you pour in a little less natural energy?!"
Katsuyu replied apologetically,
"Lord Naruto, I'm truly sorry. Shikkotsu Forest's natural energy must pass through me first. To learn Shikkotsu Forest's Senjutsu, you must first master the ratio for producing Senjutsu Chakra, and you must also possess a minimum amount of chakra to withstand the first influx of natural energy."
"As you know, I may have lived a little too long. Once I start pouring in natural energy, it