Steel Spin (also called Steel Spine) is a boss from Darius II, which later returns in Darius Burst and Darius Burst Another Chronicle. One of the various Belser flagships, Steel Spin is a versatile battleship that, despite it's size, poses a considerable threat. Not only it is extremely fast, it is capable of shooting lasers and needles in all directions. It is also protected by a ring of orbs that orbit the ship, which it can control to spread around or to protect it closer. It is shaped after a porcupine fish.