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

Antivirus

At the start of a combat: Place this card faceup in your play area. While this card is in your play area, the Nekro player cannot use their TECHNOLOGICAL SINGULARITY faction ability against you. If you activate a system that contains 1 or more of the Nekro player's units, return this card to the Nekro player.
The Nekro VirusPromissory note

At the start of a combat:

Place this card faceup in your play area.

While this card is in your play area, the Nekro player cannot use their TECHNOLOGICAL SINGULARITY faction ability against you.

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

Source: Base game

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tirules.com
  • The effect of Antivirus does not prevent the Nekro player gaining a technology from a player via their GALACTIC THREAT ability.
  • The player holding Antivirus may only play it at the start of a combat they are participating in.
    • Antivirus may be played at the start of a combat that the Nekro player is not participating in.
  • Antivirus has no effect while it is in a player’s hand.
  • Antivirus is returned when the system is activated, even if the active player will perform no hostile acts towards the Nekro player this turn.
  • Activating a system containing only the Nekro player’s structures will still cause Antivirus to be returned.
  • If an effect other than activating a system during a tactical action places a command counter in a system with the Nekro player’s units (for example, the primary ability of the Diplomacy strategy card), this will not cause Antivirus to be returned.