Thirteen Night Swords

Thirteen Night Swords (十三の夜剣) is a secret society formed by thirteen major noble families who wield great influence and make them the most influential power faction in ruling over Midgar Kingdom from the shadows, which they got substantial help from the Cult of Diablos.

Overview
The Thirteen Night Swords are a underground faction within Midgar Kingdom that dominating the control of the nation.

History
Thirteen Night Swords are a political alliance of noble families that have been formed in controlling 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.

Organization Strength and Influence
Thirteen Night Swords possessed enough wealth, as well as control over lands and territories in the Kingdom to rival, if not outright surpass, the King Klaus Midgar himself.

Due to their aristocratic status, they often abused their power from their respective important positions to commit any crimes and had great influence being able to cover up any wrongdoing until they were acquitted of any atrocities, no matter how badly they had committed it with help from 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 in name only while all but secretly engaging in power plays in reality.

Trivia

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