Sō'unga was a sword in the possession of Inu no Taishō. Unlike Tessaiga and Tenseiga, Sō'unga was not forged from the fang of Inu no Taishō. It has a consciousness and can force others to his will. Sō'unga has the power to bring back the dead. It can unleash a devastating attack, called Gokuryūha.