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

Aetherpassage

After a player activates a system, you may allow that player to move their ships through systems that contain your ships.
The EmpyreanFaction ability

After a player activates a system, you may allow that player to move their ships through systems that contain your ships.

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.