Rakan Niō Ken

Rakan Niō Ken (羅漢仁王拳, Arhat Deva King Fist, अर्हत् বজ্রপাণি मुष्टि)

A 5,000 year old assassination style Indian martial art with huge destructive power said to turn its user into an incarnation of a Devil. It is used by Devil Rebirth, a prisoner in Villainy Prison who was convinced for killing 700 people with only one use of this style. The name "Devil Rebirth" itself is also the title of the style's successor. The style was so brutal and destructive, it was banned by the emperor.