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

Gravity Drive

After you activate a system, you may exhaust this card to apply +1 to the move value of 1 of your ships during this tactical action. Then, after movement, if any ship moved through or out of a system containing a gravity rift, a supernova, or a wormhole, you may spend 1 resource to ready this card.
Technology – Propulsion

Propulsion

After you activate a system, you may exhaust this card to apply +1 to the move value of 1 of your ships during this tactical action. Then, after movement, if any ship moved through or out of a system containing a gravity rift, a supernova, or a wormhole, you may spend 1 resource to ready this card.

Prerequisites: Propulsion

Source: Black Spectrum

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Gravleash Maneuvers

  • If a ship has its movement value increased by the Gravity Drive technology, then other ships will have their movement values increased to match the modified value.