Nenjūbyō

, one of the original genjutsu, as well one of the strongest genjutsu, existing during the era of the Sage of Six Paths, or rather, the era following his. Developed by Tenzu, one of the original users of the Yin-Yang Release; Nenjūbyō is an extremely potent, 'real' Genjutsu and is one of the four methods in which he expresses his unique, pure, Yin-Yang Release.