Flower–Fruit Mountain

While in his transformed state, Rōshi creates a small volcano that explodes violently, sending molten rock flying up in all directions like a giant flower. The heat of the lava is enough to burn tailed beasts as strong as Gyūki.

Trivia

 * The summit of the is the birthplace of Sūn Wùkōng, the main character of the Chinese novel Journey to the West. The mountain is located on a volcanic island. The Four-Tails, of course, is based on Sūn Wùkōng and the Dragon Ball series, which in turn is also based on Journey to the West.
 * When written as 火山, kazan means 'volcano'.
 * In an anime exclusive sequence, Rōshi, while offscreen, used what appears to be this technique when colliding with Kisame's Water Release technique.