Six Paths Yang Power

The Six Paths Yang Power is a sealing tattoo that was created by Hagoromo Ōtsutsuki and is part of a powerful sealing technique.

Background
By utilising the Yang Release within the seal, Naruto can heal others from an otherwise fatal and untreatable condition; such as halting the effects of the Eighth Gate on Might Guy, restoring Kakashi Hatake's missing eye, and resuscitating a dying Obito Uchiha. This ability, however, does have its limits Obito Uchiha was unable to be completely recovered by Naruto's healing attempt with Sakura Haruno even acknowledging he was still dying. Not only that, Naruto was unable to heal the effects of Kaguya's All-Killing Ash Bones, albeit being capable of slowing down the process enough for the latter to give his final wishes.