From Paradox Interactive:
The Silver Seas introduces the Mercantile culture, which lets players build cities on land or water and turn trade, alliances, and rivalries into profit. Players can choose between two subcultures: the Cartel, which uses smuggling routes and stolen information, or the Barony, which commands armies and places bounties on its enemies.
The expansion also includes:
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Two playable forms: the Aqualon and Sharkkin
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Four tomes focused on waterways, plundering, the undead, and freezing the ocean
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Pirate dwellings with different captains, plus aquatic events, landmarks, Ancient Wonders, and infestations
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Additional wildlife units, music, realm options, and an interface skin
