Angel

Within the Boros, angels are considered to be incarnations of the spirit of justice and revenge. They are considered to be the top members of the guild, whose parun Razia is an angel herself. Razia created all other Boros angels as clones, reflections, or copies of herself. They all lived in the floating hall called the Parhelion.
  Boros angels possess no need to drink, eat, or sleep, but can if it so pleases them. They have enhanced strength, a strong sense of duty and morality, and are supposedly incapable of lying. Boros angels can hear people calling their names from anywhere in Ravnica.
  The only surviving first-generation angel is Feather, who became the Guildmaster after Razia's death. Following in her progenitor's footsteps, Feather created a new lineage of angels. Feather was later replaced by one of these Angels, Aurelia, who argued that a disgraced angel can't command authority or respect. They have only two wings, unlike the original generation which had four wings.