"Mm, Uncle Hai said the Body Substitution Technique has two weaknesses. First, it requires an item containing one's own chakra as a substitute. Second, chakra consumption becomes terrifying as the distance increases. I encountered both of these problems while using it, so I want to focus on improving this ninjutsu. Do you have any good suggestions?" Mirai asked expectantly.
This was indeed something he desperately wanted to know. His proficiency in the "Body Substitution Technique" had already reached 82%, and he expected it to reach full mastery and level up within the next ten days.
Mirai greatly hoped that the Third Hokage could offer him some advice and allow the Body Substitution Technique to level up smoothly twice. In his view, the "Body Substitution Technique" had enormous potential. Once its flaws were resolved, this spatial ninjutsu, abandoned by the older generation, would surely shine with its true brilliance.
Sarutobi Hiruzen had not expected Mirai to ask such a major question as soon as he arrived. The Substitution Technique was practically a basic ninjutsu for everyone. Countless people had researched it and tried all sorts of methods to improve it, but it seemed to be restricted by certain rules, and there had been very few results.
"Thousands upon thousands of people have considered improving the Body Substitution Technique, and they have found some effective methods, such as strengthening one's perception and improving chakra control," Sarutobi Hiruzen said after pondering for a while. "However, the results are very limited and cannot fundamentally change this ninjutsu."
"Grandpa, why does strengthening perception improve the Body Substitution Technique?" Upon hearing Sarutobi Hiruzen mention those two methods of improving the Substitution Technique, Mirai immediately asked.
Sarutobi Hiruzen was more confident when it came to this question. He spoke at length, "That is because when the Body