The formation Uchiha Yato had set up this time looked ordinary, but it actually concealed profound mysteries.
This formation was none other than the famed Impure World Reincarnation Jutsu, a forbidden technique capable of summoning the dead back from the underworld.
As the key sacrifice for this technique, Uchiha Yato had not chosen an ordinary corpse, but an unconscious White Zetsu.
After his tireless efforts and continuous improvements alongside Orochimaru and the others, this ninjutsu had now achieved a major breakthrough. The number of sacrifices required could be reduced to a minimum, and other substitutes could even be found.
As a result, Impure World Reincarnation, once regarded as a taboo ninjutsu, was gradually beginning to fall outside the category of forbidden techniques.
After all, occasionally summoning a powerful fighter to assist in battle was undoubtedly a highly tempting option.
However, Uchiha Yato was not using Impure World Reincarnation at this moment to summon a powerful fighter to solve his troubles.
His true purpose was to verify a long-buried suspicion.
The moment Uchiha Yato activated Impure World Reincarnation, he stood silently in place, staring unblinkingly at the center of the formation, his heart filled with anticipation.
Second by second, time passed, and his wait seemed endless.
Yet despite waiting patiently for so long, he never saw a resurrected figure emerge from the formation.
Uchiha Yato sighed at that moment.
"Just as I thought, there's a contingency in place. I wonder when they began laying the groundwork."
Uchiha Yato's Impure World Reincarnation had failed. As someone who had improved this ninjutsu, he actually understood it better than Tobirama Senju, its original developer.
However, the main reason for Uchiha Yato's failure was not that he had used the ninjutsu incorrectly, but that the soul of the person he wished to summon was no