This expansion contains two additional maps - Byzantium and Hispania - and a new trading Good - Salt, and a new Forum mechanic. The additions are modular and optional, and serve to add variety and new challenges to the game.

Salt is the most valuable of all the trading Goods and can serve as a wild card - supplement any other Good in any trade.
Forum introduces a set of bonus Cards that can provide either ongoing or situational bonuses throughout the game.
Byzantium is a 28 City map with 10 Provinces and no new mechanics.
Hispania is a 23 City map with 9 Provinces and no new mechanics.

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More details on the official game page of Concordia: Digital Edition - Salsa ...