Will Materialisation

This ability allows the user to materialise their will into a physical form. In most cases, this appears as a black substance that can be used for various purposes.

Usage
Kaguya Ōtsutsuki was able to use her chakra to create life to fulfill her desires. In an attempt to retrieve the chakra bestowed upon her two sons, she imparted her will upon the God Tree and all the people tethered to it, creating what then became the Ten-Tails. Titanic in size, she was able to use its power to fight her children for a length of months.

Immediately prior to being sealed by Hagoromo and Hamura, Kaguya Ōtsutsuki formulated a plan that would result in her eventual revival. To accomplish this, she created a sentient being known as Black Zetsu, which would spend centuries fulfilling her desire. Created as a malleable construct, Black Zetsu is capable of controlling the actions of others by coating itself over their bodies and taking possession of them. Once the remnants of her chakra were finally reuinited, Black Zetsu was able to revive her within a new host, Madara Uchiha. It was also capable of manipulating the husk of the Ten-Tails, extracting a number White Zetsu from it.

The latter was also capable of using this ability. Moments prior to his death, he attempted to infuse his will into the right half of White Zetsu, seemingly creating Black Zetsu, which he referred to as a weaker version of himself; in actuality, Black Zetsu merely made it look like it was being created as part of its plan. Madara then caused a black rod to emerge from the flowering tree he was attached to and told Obito it was a physical manifestation of his will, and that he should use it when performing the Six Paths Technique.

On a later occasion, following his resurrection, Madara caused a number of these black rods to emerge from Obito's artificial right half, which became entirely coated in his will. This allowed Madara to remotely control Obito's actions using his chakra, as well as fire black rods out of his body as projectiles, though Obito was ultimately able to resist his control.