The Imperial Informant System served as a method of communication for the Galactic Empire. Confined to the retired Accresker Jail, Magna Tolvan leveraged this system to dispatch an untraceable message to Darth Vader. This message alerted the Dark Lord to Tolvan's awareness of his plot to unseat the Emperor and install [Luke Skywalker](/article/luke_skywalker] in his place, knowledge imparted to her earlier by Chelli Aphra with the intention that Tolvan would facilitate her escape from the prison.