The Art of the Inazuma (百雷鎚の術; Hyakuraiduchi no Jutsu, "Art of One Hundred Thunder Hammers") is a Ninpo Art used by Ryu Hayabusa in the Ninja Gaiden series. It can be found in Ninja Gaiden during Chapter 10: The Aqueducts, after defeating the Electric Worm. In Ninja Gaiden: Dragon Sword it is given to you in Chapter 3 after waking Muramasa up.