Twilight's Fall – a separate game. Twilight Imperium's expansions, mods and rules topics are not part of it.

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Hydrothermal Mining

At the start of the status phase, gain 1 trade good for each ocean card in play.
The Deepwrought ScholarateTechnology – Biotic

Biotic

At the start of the status phase, gain 1 trade good for each ocean card in play.

Prerequisites: Biotic

Source: Thunder's Edge