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

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Slipstream

During your tactical actions, apply +1 to the move value of each of your ships that starts its movement in your home system or in a system that contains either an alpha or beta wormhole.
The Ghosts of CreussFaction ability

During your tactical actions, apply +1 to the move value of each of your ships that starts its movement in your home system or in a system that contains either an alpha or beta wormhole.

Source: Base game

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tirules.com
  • SLIPSTREAM does not apply to the Creuss Gate or to the Hil Colish, or to gamma wormholes.

Sources

LRR: Living Rules Referencetirules2: tirules2.comCommunity: TI4 Online Discord, TI4 Homebrew Hub Discord