Uchiha Yū's words struck right at Orochimaru's heart. His previously indifferent face gained a hint of contemplation as he waited for Uchiha Yū to continue.
"This forbidden ninjutsu is called Netherworld Gate."
Both Orochimaru and Muichiro Tokito focused on the underworld, realizing that it would be the direction of their next research.
Unfortunately, Uchiha Yū's next words made both their eyes twitch, and Orochimaru immediately lost interest.
"Although I have mastered this forbidden ninjutsu, for some unknown reason, it cannot be written down. Furthermore, using it requires the sacrifice of a human life."
They could not possibly ask Uchiha Yū to sacrifice his life to open the gate. And if it could not be written down, then the forbidden ninjutsu had no value whatsoever.
Just as the two lost interest, Uchiha Yū's tone abruptly changed. With a smile, he said:
"I brought the stone wall bearing the forbidden ninjutsu with me. We can use the lives of enemy ninja to activate the stone wall. That way, we can learn the forbidden ninjutsu."
The problem before them was very real: who would learn the forbidden ninjutsu? Once it was cast, the user would have to sacrifice their own life. That was unfair to the caster.
Of course, Orochimaru had never valued human lives. He said impatiently, "Then let's begin the experiment immediately. I already want to know what the world is like after a living person dies!"
Orochimaru's eyes brimmed with a thirst for knowledge—the madness of a scientist. To conduct experiments, he would stop at nothing. To achieve the results he desired, he would use every possible means!
"I'll have White Zetsu cooperate with your experiments, but now is not the time to open the underworld."
"The security here is still far too weak. Most of the ninja are fighting