Ten-Tails

The Ten-Tails is the combined form of Kaguya Ōtsutsuki and the God Tree, created to reclaim the chakra inherited by her sons, Hagoromo and Hamura. It is regarded as the progenitor of chakra, and is tied to the legend of the Sage of Six Paths and the birth of shinobi. To end the beast's rampage, the Sage became the Ten-Tails' jinchūriki and later split its chakra into the nine tailed beasts to prevent it from causing further harm. Centuries later, its revival became the objective of Madara and Obito Uchiha, who both sought to become the beast's jinchūriki in order to further their objectives.