Truth-Seeking Ball

Truth-Seeking Balls are spheres of malleable black chakra composed of all five nature transformations and Yin–Yang Release. Each is about the size of a fist and hides within the power to completely obliterate a forest.

Acquisition
There are multiple ways to acquire the Truth-Seeking Balls:
 * Entering Six Paths Sage Mode creates nine orbs which float in a circular formation behind the user's back.
 * One who becomes the Ten-Tails' jinchūriki gains ten orbs: nine which float behind their back in a circular formation, and a tenth in the form of a shakujō, which can be transformed as desired. While Hagoromo was levitating, the orbs would float below him while his shakujō hovered behind him. Obito only had two orbs at first, which floated behind his hands, but gained an additional eight behind his back upon gaining control over the Ten-Tails. The orbs of the Ten-Tails' jinchūriki are similar to Tailed Beast Balls.
 * Fully manifesting the Tenseigan grants access to nine Truth-Seeking Balls. Normally, the orbs float behind the user's back, in a sigmoidal formation for Hamura and circular for Toneri.
 * After losing the Ten-Tails, Obito created a makeshift Truth-Seeking Ball out of Black Zetsu's mass upon absorbing Madara's Six Paths Chakra, making it invulnerable to Madara's own Truth-Seeking Balls.

Usage
Truth-Seeking Balls are a type of technique that is always on standby, rather than activating from nothing, and each of the orbs can be individually manipulated at will. By utilising the power of, the balls can be shaped into a variety of forms, and the many natures comprising them can be combined to produce various effects. Obito shaped the balls by having them pierce through holes that temporarily formed in his hands, whereas other users forego this process. The balls are able to serve a variety of functions, such as forming shields, launching as high-speed projectiles, and causing massive explosions through rapid expansion. As the chakra comprising them is highly durable, the balls can serve as an effective defence, only taking damage from extremely powerful techniques. The balls can also be converted into black receivers to activate other techniques, as well as used to create the legendary Sword of Nunoboko.

The Truth-Seeking Balls are capable of using attacks that instantly turn their target to dust, prompting Hiruzen Sarutobi to compare them to Dust Release, though he noted that their fluid nature allows them to serve both offensive and defensive purposes, and they can be maintained. The balls can utilise Yin–Yang Release to nullify any ninjutsu they come in contact with; as a result, any damage done to a reincarnated individual — who can usually regenerate infinitely — cannot be repaired, and said individual can die. However, this nullification effect does not appear to be automatic, as Obito's Truth-Seeking Balls did not display it prior to him gaining control over the Ten-Tails' power. The balls can also quickly heal the user through contact, glowing red while doing so in the anime. Naruto's Truth-Seeking Balls are able to utilise his to effectively damage shadows in the invisible world of Limbo. He is also able to use the balls as Tailed Beast Balls to create the Tailed Beast Ball Rasenshuriken without entering Tailed Beast Mode. 

Shape Variants
Although the Truth-Seeking Balls are usually orbs, their form can be freely changed into what the user desires. They can grab enemies far away in the form of hands, or be thrown in the form of weapons. Because the high-density chakra is in a condensed state, it can be pulled and stretched into a smooth and flat consistency, as well as freely manipulated into any other shape.

Drawbacks
The user starts with a set amount of balls and can only control them within 70 metres of their location, allowing opponents to separate them from the user by transporting them elsewhere. If they are somehow destroyed or otherwise not retrieved by the user, they appear to be permanently lost, as no user has demonstrated the ability to replace them. Similarly, any clones produced by the user will not have their own Truth-Seeking Balls, though it is possible for the user to pass them over to a clone. Also, if a Truth-Seeking Ball was split, it can be repaired and reverted to its original form. Hiruzen suspected that there is a time limit for how long the balls can undergo each shape transformation. When the Truth-Seeking Balls expand, they are capable of damaging the user's own body provided they are not protected by other balls. Additionally, the balls are incapable of negating senjutsu, and their form becomes disrupted upon coming into contact with senjutsu chakra. In the event that the user is killed or their chakra otherwise disappears, the balls will disintegrate in the same manner as the black receivers.

Trivia

 * The term comes from Mahāyāna Buddhism. The Kanji 求 means to wish for, while the  in Mahāyāna doctrine is to find the ultimate truth within one's own mind.
 * Suspecting this technique to be a combination of at least four nature transformations, Hiruzen concluded that it is beyond both kekkei genkai and kekkei tōta. This was later confirmed by the fourth databook.
 * In Naruto Shippūden: Ultimate Ninja Storm 4, the Truth-Seeking Balls give off a purple glow.