Yamaoroshi

The Yamaoroshi is one of the 50 Skillful Grade Swords, once wielded by Billy the Orca Killer, until he was beaten by Marines Petty Officer Tashigi, who then claimed the sword for herself. Tashigi herself did not show the usage of the sword.

Abilities
The Yamaoroshi's capabilities are unknown, but under Billy's usage, he boasted that he was able to chop a killer whale with it.