<Wadatsumi> is a katana type driver used by Aoto.
Like most other known Drivers, <Watatsumi> takes the form of a sphere in it's inactive state. When active, it resembles a black katana. Between the pommel and the sheath, there is a thin rope or pipe. Along the sides of the sheath and the bo-hi ("blood groove"), it has a glowing blue "bar" that indicates it's affiliation with the element of water.