Sasori and Deidara's battle looked immensely destructive. After all, they were both members of the Akatsuki Organization, each possessing Super-Kage Level strength. Yet despite their powerful attacks, against each other as Impure World Reincarnation bodies, their destructive power was still inferior to sealing techniques.
After observing them for a long while, Moriyue had not uncovered any secrets of the Impure World Reincarnation technique from them.
But through the Sheep Talisman's soul vision, he still noticed something unusual about the two of them.
First of all, Impure World Reincarnation was clearly a forbidden technique. The reason it was forbidden was simple: merely summoning immortal, indestructible puppets was already outrageously overpowered. Moreover, as long as one had a corpse sample, even long-dead powerhouses like Uchiha Madara and Hashirama Senju could theoretically be used by the caster.
That was a little beyond the pale. The bodies created by Impure World Reincarnation were immortal and indestructible. Even fatal wounds would not kill them; they would absorb matter from the air and regenerate their earthen bodies. They might lose their ability to move during that time, but unless they were sealed further, they would soon be able to keep fighting.
That was not even the main point. After all, techniques meant to take an enemy down with oneself also required Chakra, and most high-powered jutsu consumed a terrifying amount of it. Even in their prime, most of these people could not use such techniques a second time.
Yet Impure World Reincarnation bodies locked their Chakra reserves in place.
It could be understood this way: if someone had a total Chakra reserve of 50, Impure World Reincarnation could not let him exceed that limit. If a jutsu required 51 points of Chakra, then even with an Impure World Reincarnation body, he still could not use it.