Truth-Seeking Ball

Upon becoming the Ten-Tails' jinchūriki, Obito Uchiha was able to use a unique form of Yin–Yang Release, which generate a malleable, black substance from his body.

Usage
This substance is highly versatile and can be used for offensive, defensive, and supplementary purposes. He can have them pierce through holes in his palms to become blades, wrap around him to act as a defensive shield, extend then to hit the enemy or even launch them and cause them to expand and contract and destroy whatever it touches. This can also be formed into more sophisticated weapons such as a shakujō. According to Hiruzen Sarutobi during his analysis of this ability, the technique acts on a similar basis to Dust Release, but on a greater level in terms of shape transformation, allowing it to be constantly used for either offensive or defensive purposes, though he also noted that it cannot keep its shape for very long. Hiruzen also notes that it is beyond both kekkei genkai and kekkei tōta, comprising at least four different nature transformations. At a later point, Tobirama Senju assumes this technique could be based on the Yin–Yang Release, which turns ninjutsu into nothing. He continues to state if the technique were to strike a reincarnated individual, their damages would not recover and could die regardless of their immortality.

Shape Variants
This technique can be manipulated into a variety of shapes for various purposes. According to Hiruzen, there is a time limit for each different shape transformation performed.

Drawbacks
Naruto Uzumaki and Tobirama discovered, after watching the effects of Gamakichi's attack Obito with a natural energy-imbued technique, that this substance is incapable of erasing techniques imbued by senjutsu, and when it comes in direct contact with substances such as these, their form become disrupted.