Oni Chakra

Oni Chakra is the unique chakra wielded by Kotarō Fūma and his descendants. This form of chakra is noted to be incredibly potent and cruel by many residents of the Land of Demons who witnessed the power Kotarō. It feeds off the very concept of life itself, only getting stronger and more potent the more lives it's techniques claims. Visually one can see Oni Chakra as a menacing pitch-black. Only those with Oni Chakra can utilize the techniques created by Kotarō. Even before Kotarō's time, people suspect Oni Chakra was what made the revered oni as powerful as he was, conquering lands and absolutely terrifying people with merely his foul presence. It has commonly been depicted to be the source of the seemingly limitless power of the two most powerful oni throughout history, as such all who wield it are worshipped by all demons as their next scion.