The user places a hallucinatory darkness on a target's eyesight, causing them to see nothing but black; Tō no Sho likens the sensation to being at the bottom of a deep hole. Because the target cannot see, they are very vulnerable to attack. Although this handicap is dangerous even to the likes of the Third Hokage, it is not insurmountable, as the Third is able to sense attacks to try to defend himself and smell his attackers in order to stage a counterattack. When the Third finally captures the user and begins removing their soul, the darkness disperses, something that Orochimaru, an onlooker, immediately notices.
- The full name of this technique is Genjutsu: Bringer-of-Darkness Technique (幻術・黒暗行の術, Genjutsu: Kokuangyo no Jutsu, Literally meaning: Illusion Technique: Bringer-of-Darkness Technique).
- In the manga, this technique is performed by Hashirama Senju. In the anime, it is instead performed by Tobirama Senju. In Naruto: Ultimate Ninja 3, both are capable of performing the technique.