Reincarnation Ninjutsu

are techniques that usually require or accomplish the transfer of life force between people. These techniques are generally classified as kinjutsu because the restoration of one life typically requires the sacrifice of the life of another, or that it violates the laws of nature and morality.

Trivia

 * Hōki used something similar to a Reincarnation Ninjutsu to revive Seimei, transferring his entire life force to the mummified corpse of the latter (causing Hōki's own body to vanish in the process), assisted with the immense power of Shukaku.