Under Alien Skies requires both Trinity Continuum: Aeon and the Trinity Continuum Core Corebook to play. In addition, this book provides information about six other species of aliens. Under Alien Skies expands the setting of Trinity Continuum: Aeon with details about the alien Chromatics, Coalition, and Listeners, including rules for playing characters belonging to these three species. The 188 page PDF is available at DriveThruRPG for $14.99.
Trinity Continuum: Under Alien Skies expands upon the extraterrestrial races within the game including rules to incorporate three of them as player character options.
Onyx Path Publishing has released the latest supplement for the Trinity Continuum: Aeon roleplaying game.
