How many steps did it take to eat a Chakra Fruit? The process was very simple: just open one's mouth and swallow the Chakra Fruit. But conversely, how many steps would it take to refine an Otsutsuki Clan member who had already eaten a Chakra Fruit—even digested it for a long time—back into a Chakra Fruit? That process was extremely complicated. First, Kaguya Ōtsutsuki had to be captured. With Kaguya's help, Kenichi Amamiya easily captured Kaguya Ōtsutsuki and imprisoned her. What came next was somewhat more complicated. According to the information Ōtsutsuki Isshiki had provided, after capturing Kaguya Ōtsutsuki, she first had to gain control of all Chakra. Once she had, the refinement could begin. The shell of the God Tree was also needed. Put simply, Kaguya Ōtsutsuki would be used as nourishment for the God Tree's shell—the Ten-Tails. Then, using the ninjutsu method taught by Ōtsutsuki Isshiki, the shell of the God Tree would be fused into Kaguya Ōtsutsuki's body, condensing an even more powerful Chakra Fruit. However, this was a forbidden act within the Otsutsuki Clan. Ōtsutsuki Isshiki only knew of it because an Otsutsuki Clan member had devised the method long ago, intending to hunt other Otsutsuki and grow stronger through them. It had been one way for him to become stronger. Later, the Otsutsuki Clan explicitly banned it, and that clan member was executed. Ōtsutsuki Isshiki had only learned of it after accidentally finding clues left behind by that person in a book, thereby mastering this refinement method.
"These things are really interesting. I didn't expect Ōtsutsuki Isshiki to know this method. I have to admit, that guy had some luck." Kenichi Amamiya had finished reading through this unique refinement method. It truly was interesting, and the Hand Seals required for the ninjutsu were extremely complicated