Summoning: Impure World Reincarnation

The Summoning: Impure World Reincarnation binds the soul of a deceased person to a living vessel, restoring them as they were when they were alive in order to do their summoner's bidding. It was originally created by Tokito Nara, Years after which he declared it a kinjutsu. Bradley Nara would discover the technique decades later and improve on its use until Kenji Nara perfected the use of the kinjutsu. Kenji has perfected the technique to the point that he has created a contract and can summon the dead without a sacrifice, and has even created a way to de-summon the dead.

Hand Seals
Summoning: Tiger-Snake-Dog-Dragon-Clap

De-summoning: Rat-Ox-Monkey-Tiger-Dragon-Boar-Release

Usage
Before this technique can be performed, the user must first acquire some of the DNA of the person they intend to reincarnate. This remarks that this basically amounts to grave-robbing, although blood stains or organs salvaged after the target's death also work. The soul of the intended reincarnated must also reside in the Pure Land; souls trapped in the stomach of the Shinigami, for example, cannot be reincarnated so long as they reside there. A living sacrifice is also required for the reincarnated soul to use as a vessel. To actually perform the Impure World Reincarnation, the DNA of the person to be reincarnated is smeared on a special scroll. Once the scroll is activated, the remains spread out in the form of a special seal with the living sacrifice in the center. Then dust and ash encase the sacrifice's body, giving them the same appearance that the reincarnated had at the time of their death; the process is apparently painful for the sacrifice. The sacrifice's chakra signature is completely overridden with the chakra of the one being reincarnated. Although the sacrifice is still technically alive so long as the technique is active, their body will never again be theirs and the body will die when the reincarnated soul is released.

Although Tokito was the technique's creator, his usage had two flaws: the reincarnated souls were nowhere near as powerful as they were while alive and he could only control so many at a time. Bradley is stated to have somewhat mitigated both flaws, but it is Kenji who eliminates them, bettering the Impure World Reincarnation to such a degree that it doesn't even need a sacrifice, and the reincarnations are much closer to how they were during life and he can control as many at a time as he wishes to, resources permitting. His perfection, combined with the fact that performing the Impure World Reincarnation requires no chakra from the user, causes Kenji to declare it the most powerful jutsu in history, the only flaw being that it still requires DNA of the person you want to summon.

Reincarnations can be mobilised like standard infantry, where they must travel to their destination. Alternatively, coffins that contain them can be summoned to a location, assuming someone is there to perform the summoning; the anime does not consistently require this. Reincarnations can be recalled in a similar way, with a coffin emerging around them to take them back.