On top of the high wall, Black Zetsu was also staring intently at Ren.
It had lived for over a thousand years, and its understanding of Yin Release far surpassed that of ordinary Ninja.
After its initial shock, it finally saw the principle behind it.
"In theory, it really is possible."
Obito immediately turned toward him.
"You know this secret technique?"
"No."
Black Zetsu's voice was low.
"But Susanoo is, by nature, an energy construct condensed from Yin Release Chakra."
"Since it is energy, there is naturally a possibility of merging it into the human body."
"But to complete this step, there are two hurdles that are almost impossible to overcome."
White Zetsu hurriedly asked, "What are they?"
"First, control."
Black Zetsu said in a deep voice, "Susanoo's power does not come entirely from the Uchiha themselves."
"That divine power originates from some unknown and terrifying existence."
"After awakening the Mangekyō Sharingan, Uchiha clan members merely gain the right to borrow and wield it."
"Whether it is an ordinary Mangekyō or an Eternal Mangekyō, truly controlling every trace of Susanoo's power is extremely difficult."
"To merge Complete Body Susanoo into his body, the user must make every strand of Yin Release Chakra obey him completely."
"There can be no resistance whatsoever, nor the slightest loss of control."
"Otherwise, the fusion will fail in an instant!"
Obito's voice grew heavy.
"What about the second hurdle?"
Black Zetsu stared at Ren's body, shrouded in crimson divine light, and spoke word by word:
"Physical endurance."
"The energy contained in Complete Body Susanoo is vast beyond measure."
"If an ordinary body were forcibly merged with it, its flesh, bones, and meridians would all be crushed in an instant."
"To bear an entire Complete Body Susanoo without collapsing, Uchiha Ren's physical body has already reached