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

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Stealth Insertion

If you place units onto the same planet as another player's units, your units must participate in combat during the "Ground Combat" step.
Tnelis SyndicateFaction ability

If you place units onto the same planet as another player's units, your units must participate in combat during the "Ground Combat" step.

Source: Discordant Stars