Four-Tailed Monkey



The Four-Tailed Monkey (四尾の猿, Yonbi no Saru) is a tailed beast sealed within Rōshi of Iwagakure. It has been captured by Kisame Hoshigaki, then extracted and sealed by Akatsuki.

Background
According to Madara Uchiha, the Four-Tails came into being near the end of the waning days of the Sage of the Six Paths' life; to prevent it's resurgence, the Sage split up the demon's chakra of the Ten-Tailed Beast into nine separate, monstrous constructs of living chakra, which would become known as the tailed beasts.[1] The Four-Tails eventually fell into the possession of Iwagakure and was sealed into Rōshi at a young age.

Activity inside Rōshi
As the Four-Tails' jinchūriki, Rōshi had the ability to use its power of Lava Release, a combination of fire and earth the likes of which have rarely been seen outside of kekkei genkai.