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

Vortex

ACTION: Exhaust this card to choose another player's non-structure unit in a system that is adjacent to 1 or more of your space docks. Capture 1 unit of that type from that player's reinforcements.
The Vuil'raith CabalTechnology – Warfare

Warfare

ACTION: Exhaust this card to choose another player's non-structure unit in a system that is adjacent to 1 or more of your space docks. Capture 1 unit of that type from that player's reinforcements.

Prerequisites: Warfare

Source: Prophecy of Kings

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tirules.com
  • A unit is not adjacent to the system it is in; the Vortex ability cannot target a ground force on another planet in the same system as one of the Vuil’raith player’s Dimensional Tears, unless there is a second space dock in an adjacent system.
  • Vortex cannot be used if there are no units that can be targeted.
  • If a player has all their units of a particular type on the board, other than fighters or infantry, that type of unit belonging to that player cannot be targeted.
  • If another player is blockading a Dimensional Tear, their units cannot be targeted with Vortex.