Ariovistus expands Falling Sky to take 1-4 players back to Caesar's first entry into Gaul, with a Helvetian migration challenging the Aedui and Germanic Tribes pressing close behind. New components and Faction enable one player to take command of the Germanic Tribes, while veteran Roman, Aedui, and Belgic players face unfamiliar strategic dynamics and deal with new events. For the heartiest, an extended scenario covers Caesar's full time in Gaul-nearly a decade of resistance and revolt.

To this prequel to the popular COIN Series volume, the expansion package adds tactically refined, more aggressive Non-players and extra-sturdy Forces mats usable in both original Falling Sky and Ariovistus scenarios.