Jūnigatsu

Mortales (致命, Chimei, literally the "Fatal") also known as the Fantomu Ansatsu (幻の暗殺者, Phantom Assassins) is an organization consisting of solely the greatest assassins, all of them are S-Class shinobi. There can be more than thirteen members at one time; however, only ten members will be the main member, known as Fantomu and three members will be Leaders. Numbers of 1 to 13, are carved on the members abdomens, which is counterpart of their rival organization where they used Roman Numbers. The numbers provided some secret techniques for the user and the powers are not arranged by value of number. However, the powers are still unknown.

Known Members
The bearer of Fourth Fantomu of Mortales. He is also a Seishogan user from Fantomu Clan. He joined the organization because attracted by the organization's objective, "A world without Criminal".
 * Fantomu Shiro

Nemesis
Salvador (救世主, Kyūseishu, literally the "Saviour"), an organization who protect everyone in need, even if they have to kill. They used Roman Numbers ranged from 1 to 13 to represent their members, which is a counterpart of Mortales. Salvador eventually became Mortales nemesis, who always appeared and tried to stop them. They also have secret technique provided by the Roman Numbers, which are totally different with Real Numbers.

Trivia

 * The numbers carved on the members will not disappear even after death but are possible to remove and plant on another member.
 * The numbers provide secret technique for the user.

Credits

 * Image used : Espada Of Bleach