Thirteen Night Swords

Thirteen Night Swords (十三の夜剣) is a secret society formed by thirteen major aristocratic families who covertly maintain great influence over the Midgar Kingdom with help from the Cult of Diablos.

Overview
The Thirteen Night Swords are an collective of underground aristocratic nobles from Midgar Kingdom who secretly control the country by possessed immense wealth and control many territories within the Kingdom. Due to their aristocratic status, the members of the organization can abuse their authority without any repercussions allowing them to commit any crimes while leaving unpunished.

History
Thirteen Night Swords are an aristocratic secret society that is said to control all the royal courts of Midgar Kingdom from the shadows, which have been ruled by the thirteen great noble families. Apparently, Thirteen Night Swords have a building collusive relationships with the Cult of Diablos.

Membership
The Thirteen Night Swords are a group of corrupt nobles, comprised of thirteen great noble families who banded together and formed an alliance to which they swore loyalty to the royal family while, in reality, secretly engaging in power plays.

Bloody Midgar Serial Murder Terror
TBA

Trivia

 * Isaac's family is presumably a member of this organization.