"My body's evolution has now reached a bottleneck.
My chakra has reached the limit of an ordinary shinobi.
I'm afraid only the data from Hashirama Cells and Ōtsutsuki Cells
can allow me to continue increasing my chakra."
Tobitake Tonbo summarized the changes his body had undergone over the past few years.
After gathering biological data from numerous chakra-bearing humans, his body had evolved.
It had now reached a bottleneck.
He needed information from even more powerful chakra constitutions to increase his chakra further.
Or he needed to accelerate the gathering of spiritual energy.
But according to his estimates, even Hashirama's chakra might no longer be enough.
Because the amount of chakra he possessed had already surpassed the Tailed Beast inside Naruto.
Over the years, he had not merely cultivated Sage Mode. He had also traveled the world, gathering information while collecting biological data from shinobi scattered across different regions.
It was not only Hashirama and Naruto who possessed enormous chakra reserves.
There were also many shinobi like Kisame and the successive Raikage.
They were all beings whose chakra could rival that of a Tailed Beast.
And among such people, in the vast Shinobi World, there was no shortage of mutants.
People with chakra that could rival a Tailed Beast.
It was simply that some of them had never been discovered and had never become shinobi.
Their constitutions were exceptionally powerful.
Among ordinary people, they were either troubled by their enormous chakra or benefited from it.
And this powerful constitution allowed him to expend chakra without restraint when experimenting with ninjutsu.
Once his Limitless Mode emerged, it increased his margin for error fiftyfold.
"Perfect Sage Mode can already be maintained permanently."
The Sage Mode he had named Limitless Mode was also Perfect Sage Mode.
It allowed his body to remain fused