Seraphs

Seven Seraphs appears to be one of the five factions of the Guardians of the City.

Trivia

 * The faction is called Seven Seraphs because Bungie's affiliation with the number 7.
 * A Seraph, also known as seraphim, are a variant of angels in the Jewish and Christian faiths. Seraphs are usually described as six winged beings who surround God's throne in heaven.