Moon Blade

The Moon Blade (がちりん刀, Gachirin Katana) is a powerful and the secret sword that grants the wielder unparalleled power if accompanies with the Sun Blade according to a legend. Bringing that legend to reality is the Council of Swordmasters's longstanding mission.

It is similar to the Sun Blade as it's opposite. Its current location is unknown. Before passing away during his battle against the Monster Association, Nichirin entrusted Atomic Samurai, the only survivor of the Council of Swordmasters, with the task to find the Moon Blade.