Madness

The Madness Release (狂気流, Kyokiton) is a Demon-exclusive Kekkei Genkai used by the demon Raio. It combines Dark with Shadow to create a black flame-like substance, adorned with strange eye-like patterns. When anything is struck by these flames, they slowly begin to lose their sanity, as well as suffering from damage. So far, it has only been used by Raio when he takes control of Susano's body.

Trivia

 * It was inspired by the concept of madness as a physical substance by Soul Eater.