Raiden (nemuranai)

Raiden was was a exquisite blade crafted by the finest smiths of the Isawa vassals and enchanted personally by the Master of Air Isawa Tsumaro, who made the nemuranai to respond to certain commands.

Known Users
In 1199 the courtier Agasha Kodo used in Kalani's Landing the magical blade, unleashing the power of Thunder against Yoritomo Kanahashi. A lightning had erupted from the blade and consumed Kanahashi utterly. The Mantis magistrate had been questioning the sanity of the Master of Water Asako Chukage, supposedly affected by P'an Ku's madness, and Kodo protected her charge at all costs.