Star Wars Age of Rebellion Cyphers and Masks is interesting in that there have been few past Star Wars RPG resources devoted to spies and espionage. Infiltration and working behind enemy lines is obviously a major element in Rebel era games and touched on often in all kinds of sourcebooks. WEG's various Cracken's books were intelligence oriented, some with gear, though most concentrated more on providing NPC adversaries and some adventure ideas. Cyphers and Masks is the first to really pull together in one place, everything from character options to spy gear to campaign ideas, to new ways to use the narrative dice with skill checks.