The Zero-Tails In the world of Naruto, the Tailed Beasts are powerful creatures divided from the original Ten-Tails by the Sage of Six Paths. However, there is an often overlooked Tailed Beast known as the Zero-Tails.

This tailless creature exists beyond the One-Tails to the Nine-Tails and is called the Zero-Tails of Nothingness.

It wears a mask with the number "zero" on it and resembles No-Face from "Spirited Away". Despite its terrifying appearance, it possesses considerable power. 

The Zero-Tails has its own Jinchuriki, Amaru. Its power is fueled by dark chakra and it has an energy cannon capable of leveling a mountain. Naruto and Sasuke had to weaken its chakra before defeating it.