Volta asked you to help Sedar, whom the Heavenly Lights tasked to infiltrate the Plateau of Retribution in Nosra. You met Sedar, who asked you to free Tribune Prometheus at the Altar of Silence when the power of Aether grew stronger. After you saved Prometheus, he asked you to find out more about the unknown group holding the Guardians prisoner. You found a Fanatic Mark with the Fanatics, which you brought back to Volta. He thanked you and said that he would send the mark to Sanctum for investigation.