Amatsu

An ability that awoke in Sannotō Uchiha's eyes, Amatsu creates a path that sends anyone who is hit with it directly to an alternate dimension of unusual circumstances, apparently killing them without actually harming them. It creates a massive black circle that will send a entire body into the hellish dimension, leaving no trace left behind. However, when fiurst used by Sannotō, the Amatsu will take the form of a black cresent moon that only sent a part of a person into hell along with their soul; stronger opponents may be uneffected by the cresent Amatsu. As Sannotō gained strength, the Amatsu grew until it became a perfect circle. Upon "completing" his Sharingan, Sannotō could fire a single black cresent or several black cresents that not only cut a opponent but have their remains sucked up. The cutting power of the attack is strong enough to easily break through even Susanoo, and because of its structure being comprised of yin and yang chakra, even the powerful black flames of Amaterasu cannot catch onto it.

Behind the Scenes
The technique is heavily based on Meidō Zangetsuga, from the series Inuyasha. The name of the technique is based on the Amatsu-Mikaboshi (天津甕星, "August Star of Heaven"), also called Ame-no-kagaseo (天香香背男, "Brilliant Male"), which is the god of evil and of the stars, specifically the pole star, in Shinto belief.