Outer Path — Samsara of Heavenly Life Technique

By channelling his power through the King of Hell, Nagato can re-infuse new life force energy to the dead bodies of those recently killed. With their rejuvenated bodies acting as an anchor, the individual souls are then able to leave the crossroad between life and the afterlife, returning back to their physical vessels. The technique targets all the individuals killed, even those not necessarily killed by the Six Paths of Pain. There seems to be a limited time for when this technique can be used, as Nagato is unable to bring back those who have remained dead for an extended period of time, such as Yahiko and Jiraiya. This technique requires a massive amount of chakra, as it resulted in Nagato's death due to chakra overuse. Nagato became severely weakened, his hair becoming increasingly thinner and greyer as he performed the technique.

Influences
As with many of Nagato's techniques, it is influenced by Buddhist terminology. , derived from the Sanskrit Tīrthika, refers to any doctrine which "treads the outer path" to enlightenment. This is opposed to the teachings of orthodox Buddhism (the "inner path"), and is thus considered misguided and heretical.

Trivia

 * Madara Uchiha noted that this technique was originally meant to be used for his purposes.