Black Plague

The Black Plague (, Burakku Purēgu; lit. "Dark Power Blurring Vision") is a recurring Magic Phenomenon across. It seemingly harnesses an aspect of an individual and can cause their transformation into a Black Beast (黒い獣, Kuroi Kemono). Although initially uncontrollable, much like the Dragon Seed, these transformations can either be suppressed or be manipulated to one's will given enough time or the proper supervision.