Dream Blades: Musashi

Mucro Somnio: Musashi (夢刀・六三四) is a Nox Nyctores with the shape of a pair of kodachis, one stored in each end of the sheath. This weapon is wielded by Mitsuyoshi.

Information
Supposedly, Musashi's power is to cut "what cannot normally be cut"; it is unclear on what this meant. It is heavily implied that it is able to destroy a magical field or barrier, or possibly anything it chooses to cut.

Trivia

 * It is apparently named after Musashi Miyamoto, a historical samurai who was known to fight using two swords.