The Combination Armament DenGasher (連結武装デンガッシャー Renketsu Busō Dengasshā) is modeled after a bullet train and is the Den-O systems' primary weapon. The DenGasher is composed of four separate parts (Sword, Grip, Ax, Gun) that, when not in use, are attached to the Den-O Belt. Although the weapon configurations are not limited to a specific form of Den-O, there are certain combinations which function best with a corresponding form. Climax Form typically uses it in Sword Mode, although on rare exception he has used its other forms (such as the Gun Mode against the Armadillo Imagin).