Flower–Fruit Mountain

While in his transformed state, Rōshi creates an enormous torrent of lava that violently erupts from the ground, before rushing upwards towards the target.

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'. Then, if you substitute 果 with 火, you get . 果 is also the Japanese for the Phala.