Rinkaku (回転している立方体, Rotating Cube) is Ryun's own invention. The jutsu is created by both of Ryun's hands. Ryun first forms a sphere of chakra, then encases it in a transparent cube of chakra. Shirokaze Fuyutama comments that the technique has the capability to surpass others of it's variety. Upon contact with another object, Rinkaku will crush and pulverize it's target. A drawback to the technique is that it cannot be completed in Ryun's base form.