PAX: Nocturnus adds three new types of cards to the game PAX, giving the players more ways to beat Rome – or help Rome withstand an assault from escaped slaves who threaten to rebel against the empire. With the additional cards, game play takes longer since the game lasts until the deck runs out. PAX: Nocturnus can also be used when playing solo, or when combining two PAX games to allow 5-8 players to compete at once. This expansion comes packaged with Pergamemnon: Antebellum, an expansion for the separate card game Pergamemnon.