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

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Rift Engines

After you activate a system, you may exhaust this card to choose 1 ship you control and roll a die. On a result of 1-3, remove that ship from the game board; on a result of 4-10, apply +2 to that ship's move value during this tactical action.
Shipwrights of AxisTechnology – Propulsion

Propulsion

After you activate a system, you may exhaust this card to choose 1 ship you control and roll a die. On a result of 1-3, remove that ship from the game board; on a result of 4-10, apply +2 to that ship's move value during this tactical action.

Prerequisites: Propulsion

Source: Discordant Stars