"I can't judge Deidara's case, but Nagato and Konan should have been confirmed dead.
If you can't use Impure World Reincarnation on them, then it must be the third possibility. At the Five Kage Summit, I saw the Fourth Hokage who had been reincarnated through Impure World Reincarnation. It seems the other side is also using this forbidden technique to build up its forces.
Our current strength is already sufficient. It seems we can't give the Five Great Ninja Villages any more time, or the situation will become increasingly unfavorable for us."
Kabuto Yakushi's uninvited arrival, along with the bargaining chip he had revealed for cooperation, made Obito deeply realize that he had severely underestimated the forbidden technique known as Impure World Reincarnation.
Over all these years in the shinobi world, countless renowned heroes had died in battle. They could use Impure World Reincarnation to summon powerful figures, and naturally, the Five Great Ninja Villages could do the same.
Moreover, the other side had far more manpower. When it came to things like robbing graves and digging up tombs, they were obviously much more efficient. The longer preparations dragged on, the more disadvantageous it would be for them.
"As a forbidden technique, the stronger the target of Impure World Reincarnation, the more Chakra it consumes.
Back when the Second Hokage developed this technique, the reincarnated targets were generally cannon fodder covered in Explosive Tags.
But the technique I use now is no longer the original Impure World Reincarnation. Lord Orochimaru and I improved it repeatedly.
That is why I can reincarnate so many powerful shinobi at once and place restrictions on them.
Konoha may have records of this technique, but I don't believe anyone can reincarnate such a large number of legendary shinobi at once like I can."
Back then,