The moment he finished speaking, Hagoromo Otsutsuki's figure flashed.
Light flickered in his hand. With lightning speed, he swiftly cut a large, fresh chunk of flesh from his own body and hurled it forcefully toward Obito Uchiha.
Obito Uchiha reacted just as quickly, a strange gleam flashing through his eyes.
The incoming chunk of flesh seemed to be pulled by an invisible force. In the blink of an eye, it vanished from where it was and entered the Kamui Dimension under his control.
After doing all this, Obito Uchiha nodded slightly and said to Hagoromo Otsutsuki, "All right, follow me!"
With that, he turned and walked ahead.
Hagoromo Otsutsuki did not hesitate either and immediately followed closely behind Obito Uchiha.
The two continued onward, turning left and right from time to time as they passed through a maze of winding passages and caves.
After an unknown amount of time, they finally arrived at the deepest part of Ryūchi Cave.
In an instant, Hagoromo Otsutsuki felt an incomparably powerful and vast surge of Natural Chakra wash over him like a tide. It was immense and turbulent, flowing without end as if it were inexhaustible.
"What kind of place is this? This is truly unexpected. To think such a miraculous place exists, with such unique and powerful Chakra!"
Hagoromo Otsutsuki widened his eyes, his face filled with shock as he surveyed the dark, damp surroundings. He could not help marveling inwardly.
"Now, I'll teach you Sage Art!"
Obito Uchiha turned around.
"For people to successfully use Ninjutsu, the key lies in fully mobilizing the Chakra power hidden within their bodies."
"Generally speaking, ordinary Chakra is formed by blending the energy contained in one's body with spiritual energy."
"However, there is another, more powerful and mysterious form of Sage Chakra in this world."