Mizu-ō (水王, Water King) is a demon-slaying sword that is wielded by Aith Tantler. Aith had defeated the former King of Water and sealed his demonic waters into the blade. Mizu-ō is capable of pouring out limitless amount of water. Aith can freely control the water at will. The water pressure and density is also under control of Aith.
Water Slash is performed when Aith fires off a sharp, compressed blast of water at the opponent, capable of slashing through boulders easily.
Pressure Bomb is performed when Aith extracts a large amount of water from Mizu-ō and surrounds the opponent. The giant ball of water decreases in size and compresses, therefore crushing the opponent from the pressure.
Death Urchin is performed when Aith surrounds himself with a ball of water and shoots out multiple tentacle-like attacks at hte opponents, capable or piercing through boulders easily.
Shark Torpedo is performed when Aith shoots out 5 sharks made out of water at the opponent. The sharks act as if they were real and bites the opponent.
Water Slicer is a bigger, much more powerful version of Water Slash.