Inside Sora's residence.
Barrier Training Room.
Sora stuffed himself full again, then picked up a scroll from the table.
<Control Techniques for Tailed Beast Chakra · Written by Kinkaku>
These were the notes on cultivating tailed beast chakra left behind by the Gold and Silver Brothers.
This scroll had always been an absolute secret among Kumogakure's upper ranks. Like the forbidden techniques within Konoha's Book of Seals, it was classified as top-secret forbidden knowledge.
Back then, Gold and Silver had been swallowed by the Nine-Tails and remained inside its stomach for two whole weeks.
While inside the Nine-Tails, they gnawed on its flesh and absorbed its chakra. Unable to endure them any longer, the Nine-Tails eventually spat them out. From then on, the two brothers possessed a portion of the Nine-Tails' chakra.
They had acquired the power of a tailed beast through their own abilities alone, without relying on any sealing methods, in such a violent manner.
To Kumogakure at the time, this power was nothing short of a miracle.
After the First distributed the tailed beasts, Kumogakure eagerly began studying this power alongside Gold and Silver. They even compiled the brothers' methods of controlling and containing tailed beast chakra into scrolls, hoping to mass-produce "pseudo-Jinchuriki."
Unfortunately, not a single person succeeded.
They had clearly followed Gold and Silver's method step by step.
Yet once tailed beast chakra entered their bodies, the test subjects were either consumed by its extreme negative emotions and went berserk, or they could not withstand the chakra and exploded to death.
After more than a dozen, perhaps even dozens of failed attempts, coupled with political factors and competing interests—
This cultivation scroll concerning tailed beast chakra was ultimately deemed an exclusive secret art that only Light of the Clouds could cultivate.
After that, it was