The Musou Saber (無双セイバー Musō Seibā, lit. "Unrivaled Saber") is Kamen Rider Gaim, Zangetsu, Bujin Gaim, Gaim Yami, and Jam's side weapon. It can also be summoned and utilized via the special ability of Kiwami Arms. Kamen Rider Drive can also use this weapon, alongside the Daidaimaru, when he transforms into Type Fruits. Kamen Rider Ghost can also use this weapon, alongside the Daidaimaru, when he transforms into Gaim Damashii. It first appears in episode 52 of Kamen Rider Wizard.