The Art of the True Inferno (真．火炎龍の術, Shin．Kaen Ryu no Jutsu; "Art of True Flame Dragon") is a true form of the ninpo art Art of the Inferno used by Ryu Hayabusa. It's his only ninpo in the original version of Ninja Gaiden 3 and is obtained after the final battle with the Regent of the Mask in Ninja Gaiden 3: Razor's Edge.