Outer Path

The is the seventh path of Pain, Nagato, not included with the main Six Paths of Pain. The path has control over Life and Death itself.

One of the Outer Path's jutsu is the Outer Path: Samsara of Heavenly Life Technique. By channeling his power through the King of Hell, the Outer Path can re-infuse new life force energy to dead bodies of those who have recently died. With their rejuvenated bodies acting as an anchor, the Outer Path draws back the individual souls that reside between life and the afterlife, returning them to their physical vessel. The jutsu can target all individuals who have been killed, even those not necessarily killed by the Six Paths of Pain.

Depending on the degree, performing this act of revival can require a massive amount of chakra, due to which resulted in Nagato's death from chakra overuse. He became severely weakened, with his hair became increasingly thinner and grayer during his use of the technique. There also seems to be a time limit to when this technique can be used, as Nagato is unable to bring back those who have remained dead for a long period of time, such as Yahiko and Jiraiya. Lastly, while the Nagato is channeling his ability through the King of Hell, others are capable of seeing the summon.

The Outer Path's control over Life and Death may also been the method to how the individual Six Paths of Pain were created, as Nagato is capable of taking a deceased body and reanimating it back to living functionality, albeit without its original soul. Nagato then implements his black chakra receivers into the body, allowing him to transmit his chakra and take control of body as if it was his own.

Trivia

 * The Outer Path is based on the King of Hell, Yama, the judge of the dead in the Buddhist religion. He decided if someone stayed dead or returned to the world of the living, and would choose how they would be reincarnated.
 * Gedō (外道, lit. "Outer Path"), 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.
 * The black flames that surround the base of the Outer Path resemble those of the Amaterasu.