Serpent's Tooth

Serpent's Tooth was a magical yari crafted for and wielded by Daidoji Yurei. They yari was crafted from an unusual green wood, and when swung it would resonate with a strange hissing sound like a snake. It is said the blade hungers for Lion blood and those who carry it are driven by the need to slaughter any Matsu who stand against them. (Crane p. 118)