Musou Saber

"Lock On! 1, 10, 100! (fruit) Charge!"

- Finisher announcement

The Musou Saber (無双セイバー) is Kamen Riders Gaim and Zangetsu's side weapon, as well as Kamen Rider Fifteen's second weapon while in Gaim Arms.

The Musou Saber can be used as both a sword, which is known as Saber Mode (セイバーモード), and a gun, known as Gun Mode (ガンモード), at the same time. To activate the gun portion, Gaim and Zangetsu pull the Pallete Slide (パレットスライド) yellow tab in the back, allowing them to shoot at any range four times.

Combinations
For Gaim, the Musou Saber can combine with some of his Arms Weapons to become an alternate mode for more powerful attacks.
 * Daidaimaru: Naginata Mode (ナギナタモード)
 * Pine Iron: Kusarigama Mode (鎖鎌モード)
 * Hinawa Daidai DJ Ju: Taiken Mode (大剣モード)

Fruits Charges
By inserting a Lockseed into the Drive Launch (ドライブランチ) and locking it in place, Gaim or Zangetsu can perform a Fruits Charge (フルーツチャージ) finishing attack, which is announced by the Musou Saber counting "1, 10, 100" (一、十、百). The Musou Saber can count higher to "1,000" (千) and "10,000" (万) while combined with the Daidaimaru, as well as "100,000,000" (億), "1,000,000,000,000" (兆), and "Muryodaisu" (無量大数) while combined with the DJ Ju.
 * Orange Charge (オレンジチャージ): By locking the Orange Lockseed into the Daidaimaru Naginata Mode, Gaim can execute the Naginata Musou Slicer (ナギナタ無双スライサー), where he fires energy slashes from the Musou Saber end at the enemy, trapping them in an orange sphere. Afterwards, Gaim charges the Daidaimaru end with energy before slashing the enemy with it. This can also exist in the form of an enhanced, crowd-clearing slash.
 * Ichigo Charge (イチゴチャージ): By locking the Ichigo Lockseed into the Musou Saber, Gaim can execute the Kunai Burst (クナイバースト), where he slashes upwards, creating a giant energy duplicate of the Ichigo Kunai. The kunai then changes into a giant strawberry before exploding into countless regular-sized kunai, which rain down on Gaim's enemy, detonating as they hit. This can also be done in multiple swings.
 * Kachidoki Charge (カチドキチャージ): By locking the Kachidoki Lockseed into the Drive Launch of the DJ Ju while in Taiken Mode, Gaim can execute the Hinawa Daidai Musou Zan (火縄大橙無双斬).

Other finishing attacks
The Musou Saber can execute finishing attacks of its own without the need of a Lockseed, through the use of the Sengoku Driver's Squash, Au Lait, and Sparking functions.
 * Pine Musou Zan (パイン無双斬): After Gaim activates the Au Lait function while assuming Pine Arms, he restrains the opponent with the Pine Iron before assaulting the target with multiple slashes from the Musou Saber.

Portrayal
The voice of the Musou Saber, as well as the Lockseeds and the Sengoku Driver, is provided by Seiji Hiratoko (平床 政治).