The Genso no Oni, Dark Warrior, was one of the few intelligent oni, able to master some of the most refined combat techniques. Genso no Oni was humanoid in appearance, but it's face was that of a grinning demon. It wore a hakama in mockery of the samurai. In combat Genso no Oni would usually spar with samurai, mocking them, pointing out their faults with gleeful joy, and winning effortlessly. Only the most persistent, strong-willed samurai could hope to kill it, since this Oni was the equivalent of a master at arms.