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

Aetherstream

After you or one of your neighbors activates a system that is adjacent to an anomaly, you may apply +1 to the move value of all of that player's ships during this tactical action.
The EmpyreanTechnology – Propulsion

Propulsion

After you or one of your neighbors activates a system that is adjacent to an anomaly, you may apply +1 to the move value of all of that player's ships during this tactical action.

Prerequisites: PropulsionPropulsion

Source: Prophecy of Kings

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tirules.com
  • The Empyrean player does not decide to use this ability until after the other player has activated a system. Any deal made to use this ability before the system has been activated is non-binding.
  • A system is not adjacent to itself. If a system with an anomaly is activated, Aetherstream will not give any ships +1 to their move value, unless that system is adjacent to another anomaly.