The Imperial Informant System was a communications system used by the Galactic Empire. While she was stuck on the decommissioned Accresker Jail, Magna Tolvan used the Imperial Informant System to send an anonymous message to Darth Vader, informing the Dark Lord that she knew of his conspiracy to overthrow the Emperor and replace him with Luke Skywalker, information that was previously told to her by Chelli Aphra so that Tolvan would rescue her from the prison.