Outer Path: Endless Rebirth in the Six Posthumous Worlds

A technique granted through the Rinnegan: specifically the Outer Path.

Usage
This technique grants two known abilities.

Summoning
The user can call forth the souls of willing individuals from the Pure Land, who can then influence the living world. Hagoromo Ōtsutsuki used this ability to bring back all past generations of the five Kage in order to summon Naruto Uzumaki and friends back from. Ryun Uchiha would later use this ability to call on the aid of his former mentor and fellow Yonkō. The souls are capable of manipulating chakra, as in the case of Hagoromo, the previous Kage were able to preform a Summoning Technique, and in the case of Ryun, the Yonkō were able to lend him their chakra and preform a reverse summoning.

Reverse Summoning
As displayed by Hagoromo, this technique also can send back the souls of those brought back from the Pure Land; even those brought back through other methods.