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

Stymie

ACTION: Place this card faceup in your play area. While this card is in your play area, the Arborec player cannot produce units in or adjacent to non-home systems that contain 1 or more of your units. If you activate a system that contains 1 or more of the Arborec player's units, return this card to the Arborec player.
The ArborecPromissory note

ACTION:

Place this card faceup in your play area.

While this card is in your play area, the Arborec player cannot produce units in or adjacent to non-home systems that contain 1 or more of your units.

If you activate a system that contains 1 or more of the Arborec player's units, return this card to the Arborec player.

Source: Base game

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tirules.com
  • Stymie has no effect while it is in a player’s hand.
  • Stymie is returned when the system is activated, even if the active player will perform no hostile acts towards the Arborec player this turn.
  • Activating a system containing only the Arborec player’s structures will still cause Stymie to be returned.
  • If an effect other than activating a system during a tactical action places a command counter in a system with the Arborec player’s units (for example, the primary ability of the Diplomacy strategy card), this will not cause Stymie to be returned.