From the back cover: "An adventure in the Invid occupied Earth of 2045. Plus source book material, new mecha, Lancer and more! For use with Robotech RPG Book Five: Invid Invasion or Robotech II: The Sentinels" New Occupational Character Classes include The REF Intelligence Officer, and the E.B.S.I.S. Military Personnel. New Mecha include the "Instrumecha" - musical instruments that can do mecha scale damage. Players can choose between a Vocalizer, Guitar, Bass Guitar, Synthesizer or Percussion Set.