Usumidori (薄緑?) is a Noble Phantasm of Ushiwakamaru. The sword that beheaded the Earth Spider, it is said to have belonged to her ancestor Minamoto-no-Raikou.
The sword is used as a part of her Wandering Tales of Shana-oh, mainly Usumidori - Heavenly Blade Steps (薄緑・天刃縮歩, Usumidori - Tenjin Shukuho?), which delivers a brilliant slash with the sword after a Tengu-style Shukuchi footwork, and Hoemaru - Spider Slayer (吼丸・蜘蛛殺, Hoemaru - Kumo Satsu?), which unleashes Usumidori's true power to repel demons in the area while dealing additional sonic damage.