Chakra existed within every human body; it merely reacted differently to different nature transformations.
Much like human appearances, it came in endless varieties.
Kiyoshi could also gain a great deal from discussing it with Rin Nohara, as they explored the possibilities of new ninjutsu.
Many ninjutsu were, in fact, still being developed.
The current Shinobi World faced changes unprecedented in a thousand years.
All kinds of ninjutsu had sprung up like bamboo shoots after the rain.
During the Warring States Era, which had lasted for thousands of years, the major powers had fought without end.
The average lifespan of ninja had been only thirty. Upon waking up, the first question they faced was whether they would survive the day. All training had been clan-based, while some civilian ninja could only pick up scattered scraps to teach themselves.
Aside from Kekkei Genkai and secret techniques, there had been very few other ninjutsu.
From ninja once wearing capes and heavy armor to now fighting in light Chainmail Armor—
It was clear that the era of hacking at one another with cold weapons, with ninjutsu as support, had passed. Greater emphasis was now placed on mobility.
Because more and more powerful ninjutsu had been developed as the primary means of attack, the proper choice was to evade. Taking damage head-on was the worst of the worst options.
Tobirama Senju could be considered a representative figure in this regard. He had created many forbidden techniques: the "Flying Thunder God Technique," the "Shadow Clone Technique," the "Impure World Reincarnation Jutsu," and so on. Even the "Rasengan" Naruto often used was a product of the modern era.
Kiyoshi estimated that the "Rasengan" had not even been created yet.
Unable to endure being confined within the Sealing Barrier any longer, Kushina would disregard all attempts to stop