As one of the few surviving descendants of the Uzumaki Clan, Nagato was no stranger to the Sealing Jutsu developed by the Uzumaki Clan, the "Reaper Death Seal."
This was not only because he himself was an Uzumaki clansman, but also because he had conducted extensive investigations and explorations throughout the Ninja World while searching for the God Organization. During those investigations, he had found many Uzumaki Clan ruins and ancient texts, through which he learned much about the clan's history and the many Forbidden Techniques passed down through the generations.
The "Reaper Death Seal" was one of them.
Among all the Sealing Jutsu developed by the Uzumaki Clan, the "Reaper Death Seal" could be considered the most powerful—and likewise the forbidden technique that exacted the greatest price from its caster.
Even the mighty Nine-Tails was unable to resist this forbidden technique.
On the night of the Nine-Tails Incident, the Fourth Hokage had used the forbidden technique "Reaper Death Seal" to divide the rampaging Nine-Tails into yin and yang halves. One half had been sealed inside his son Naruto, while the other had been sealed along with himself inside the "Reaper."
Under normal circumstances, once this technique was unleashed, it could at the very least accomplish a one-for-one exchange.
In the original timeline, the Third Hokage had paid with his life to use the "Reaper Death Seal" to seal the souls of the First Hokage and Second Hokage, breaking Orochimaru's "Impure World Reincarnation." He had then done everything he could to seal Orochimaru's hands, using his own life to seal two and a half enemies.
And now, the Third Hokage was likewise prepared to pay with his life to seal Nagato.
However, the Third Hokage had clearly overestimated the "Reaper Death Seal" and underestimated Nagato, who possessed the Rinnegan. As