Creation of All Things (Ten Tails)

The was an ability possessed by the, which he used to create the nine tailed beasts, and later re-invented by Ryun Uchiha.

Ryun Uchiha
Ryun's usage is far more explained than that of the Sage's. Using yin, Ryun forms an immense chakra structure, resembling a tree, from nothing. Using yang, Ryun vitalizes this tree with life-energy, creating tremendous roots which then spreads to the nearby surroundings. With the foundation set, Ryun can then create embryos out of the imaginative and life-giving powers of yin-yang, allowing life to be created from nothing.

Sage of the Six Paths
The process the Sage used is explained to have initially involved the administration of imagination, and the spiritual energy which forms the basis of Yin chakra to create shape and form from nothingness. Then, through the application of vitality, and the physical energy which forms the basis of Yang chakra, he would breathe life into the prior form. Thus the Sage used this to split the Ten-Tails into nine separate beings.