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

Incursion

When you activate a system that contains a breach, you may flip that breach; systems that contain active breaches are adjacent. At the end of the status phase, any player with ships in a system that contains an active breach may remove that breach.
The Crimson RebellionFaction ability

When you activate a system that contains a breach, you may flip that breach; systems that contain active breaches are adjacent. At the end of the status phase, any player with ships in a system that contains an active breach may remove that breach.

Source: Thunder's Edge

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tirules.com
  • Breaches are not wormholes.
  • A system may have any number of breaches in it.
    • If a player has a ship in a system containing multiple breaches at the end of the status phase, they may remove any or all of them.
  • If the Rebellion player has no more breach tokens in their reinforcements, and an ability instructs them to place a breach, they may remove an inactive breach from the game board and place that.
    • Active breaches cannot be removed in this manner. If every breach token is on the game board as an active breach, the Rebellion player cannot resolve abilities that would place additional breach tokens.