Shinju

Tailed Beasts (Biju) in Naruto's World (10 items)
list by Tim Lee

The Shinju (神樹; Literally meaning "God Tree"), more commonly referred to as the Ten-Tails (十尾, Jūbi), is the primordial entity and the original tailed beast tied to the legend of the Sage of the Six Paths. Its chakra was divided into the nine tailed beasts and its body sealed into what would be the moon, by the Sage at the end of his life. Considered to be the progenitor of the world, its revival would herald the end of it. As of the most recent shinobi war, the beast was sealed within Obito Uchiha until the tailed beasts were extracted from Obito's body.