|Literal Meaning:||Wind Blowing down from the Mountain|
|First Appearance:||Loguetown Arc (novel)|
|Owner(s):||Billy → Tashigi|
Yamaoroshi is one of the fifty Ryo Wazamano grade swords. It was wielded by Billy the Orca Killer, until he was beaten by Tashigi, who then claimed the sword for herself. Tashigi has not yet been shown using this sword.
Yamaoroshi's capabilities are still unknown, but under Billy's usage, he boasted that he was able to chop through a killer whale with it.