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

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Gravitic Disruption

After you move 1 or more ships into the active system, you may discard an action card to move 1 of those ships into an adjacent system that does not contain another player's ships.
Vaylerian ScourgeBreakthrough

After you move 1 or more ships into the active system, you may discard an action card to move 1 of those ships into an adjacent system that does not contain another player's ships.

SynergyPropulsionWarfare

Source: Discordant Stars