What it does
Truth-Seeking Balls''' are orbs of malleable black chakra, which can alter their form and characteristics in various ways. Though only the size of a fist, each hides within it the power to obliterate an entire forest.
Description
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The term Truth-Seeker (求道, Kyūdō; Gudō) comes from Mahāyāna Buddhism. The kanji 求 means to wish for, while the Way (道, Dō) in Mahāyāna doctrine is to find the ultimate truth within one's own mind.
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If the Truth-Seeking Balls contain natural energy, users should not be able to add ninjutsu-negating Yin–Yang Release to them, as natural energy is precisely what causes other jutsu to become immune to erasure.
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Although they can nullify ninjutsu, the orbs can still be teleported away partly or wholly by Space–Time Ninjutsu.
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Despite stating that the orbs are wielded by Six Paths Senjutsu users, the fourth databook does not classify this technique as senjutsu.
** When Hagoromo was first depicted in silhouette as facing the Ten-Tails alone, he is depicted as wielding a one-sided shakujō like Madara's. When he is later shown fighting it with Hamura, he has his double-sided shakujō. -
In Naruto: Shinobi Collection Shippū Ranbu, Obito has a technique called Truth-Seeking Ball: Trailokya Extinction (求道玉・三界死滅, Gudōdama: Sangai Shimetsu), in which he combines his Truth-Seeking Balls into a single expanding orb that obliterates the surrounding area. The technique refers to the Trailokya, the three realms of karmic rebirth in Buddhist cosmology.