Yata Mirror

The Yata Mirror was an ethereal shield wielded by the left arm of Itachi's Susanoo. It is said to be endowed with all nature transformations and able to change its characteristics to any nature transformation to completely negate any attack, whether it be spiritual, or physical.

Black Zetsu claimed that this, combined with the Sword of Totsuka held in its right hand, made Itachi's Susanoo invincible.

Influence
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