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

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Privileged Citizenry

Each system can contain a number of your PDS equal to the number of command tokens in your fleet pool. For the purpose of scoring objectives, you may treat each of your PDS units as though it is a structure on any planet you control.
Mirveda ProtectorateFaction ability

Each system can contain a number of your PDS equal to the number of command tokens in your fleet pool. For the purpose of scoring objectives, you may treat each of your PDS units as though it is a structure on any planet you control.

Source: Discordant Stars