Osagisaku

The Ten-tailed demon, the Osagisaku (or Jyubi), is one of the lesser known demon types, the desubiju. It is an earth-style demon, made entirely of gemstone. Despite it's size (four times the size of the shukaku), it is a master of stealth, traveling under the ground to launch sneak attacks on the enemy- everyone. The Osagisaku is sealed inside of Saiyume Dosu, a Takigakure shinobi. The Osagisaku grants it's jinchuriki unique earth-style abilities. The few who have survived a battle with the beast say it's weakness -while in the jinchuriki's body- is cookies.

*SPOILER ALERT FOR THE ACTUAL NARUTO SERIES*

The Jyubi was created by some of the ramaining chakra original Jyubi's (hosted by the Sage of six paths) abandoned body "posessing" a wolf, which was overcome by the presence, and became its own demon.