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

Ion Storm

Place the ion storm token in this system with either side faceup. Then, place this card in the common play area. At the end of the "Move Ships" or "Retreat" substep of a tactical action during which 1 or more of your ships use the ion storm wormhole, flip the ion storm token to its opposing side.
Exploration card – Frontier

Frontier

Place the ion storm token in this system with either side faceup. Then, place this card in the common play area. At the end of the "Move Ships" or "Retreat" substep of a tactical action during which 1 or more of your ships use the ion storm wormhole, flip the ion storm token to its opposing side.

1in the deck
–chance to draw

Source: Prophecy of Kings

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  • The active player chooses which side of the Ion Storm token is initially face up.
  • All ship movement is simultaneous. If the Ion Storm token system is the active system, and the token is currently on the alpha side, a player cannot move a ship from a system with an alpha wormhole, flip the token, then move a ship from a system with the beta wormhole (then flip the token again).
  • If the Ion Storm token is in a system containing a wormhole of the same type, a player chooses which wormhole they use when moving through a wormhole of that type. The Ion Storm token only flips if it was the chosen wormhole.
    • As a system is never adjacent to itself, a ship cannot move out through one wormhole and in through the other while remaining in the system. The ship must pass through another system with a wormhole to use both wormholes.
  • If ships are moved through the Ion Storm token wormhole outside of the Move Ship or Retreat substeps of a tactical action, the Ion Storm token is not flipped.