"Your brilliance never ceases to amaze me, senior. In just a few years, you've found a way to achieve immortality.
"As for Human Experimentation, we can't follow Danzo's old path. After his experiments, any large-scale disappearances would probably make people suspect someone was conducting Human Experimentation.
"We could establish organizations in other countries across the Shinobi World and recruit Wandering Ninja. That would help clean up the Shinobi World while giving us more secret bases."
Orochimaru nodded without speaking, though his expression turned faintly strange.
Fugaku knew what Orochimaru was thinking: that he was too softhearted for the head of a great clan.
"Your proposed experiment is nearly perfect, senior, but there's one problem you haven't considered. A person's Spirit Body is pure.
"After years of training and growth, it becomes resilient enough to withstand most Genjutsu, especially for Ninja like us.
"But to take over another person's body, your Spirit Body would have to devour theirs. That would contaminate it.
"It could leave you with a fatal weakness, such as reduced resistance to Genjutsu."
Orochimaru froze. He truly hadn't considered that.
"You're right, Fugaku. It is a fatal problem. It might not be obvious at first, but after enough reincarnations, the contamination could grow so severe that I'd lose my sense of self."
Fugaku nodded. Orochimaru's research ability was exceptional. In the original story, Orochimaru had eventually recognized the same problem.
His solution had been to study Jūgo and develop the Cursed Seal. Ninja implanted with it gained great power, but their Spirit Bodies were also gradually assimilated by the seal until they became another Orochimaru.
It was a Ninjutsu developed specifically for Living Corpse Reincarnation. The Cursed Seal carried Orochimaru's spiritual imprint, and prolonged exposure caused those implanted with it to take on that imprint as well.
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