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

The Tribunii

During setup, choose a Keleres hero that corresponds to an unused faction; take that faction's home system, command tokens, and control tokens. The unchosen Keleres heroes are not used.
The Council KeleresFaction ability

During setup, choose a Keleres hero that corresponds to an unused faction; take that faction's home system, command tokens, and control tokens. The unchosen Keleres heroes are not used.

Source: Thunder's Edge

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tirules.com
  • The Keleres player chooses their starting technology after all other players, including the Argent, Bastion, Deepwrought, Firmament, Ral Nel, Rebellion, and Winnu players, have gained their starting technologies.
  • If there are not two unique starting technologies amongst those owned by other players, the Keleres player will start the game with fewer technologies. This will most commonly happen in a three player game, where one of the other players is playing as N’orr or Winnu.