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

Crash Landing

When your last ship in the active system is destroyed: Place 1 of your ground forces from the space area of the active system onto a planet in that system other than Mecatol Rex; if the planet contains other players' units, place your ground forces into coexistence.
Action card

When your last ship in the active system is destroyed:

Place 1 of your ground forces from the space area of the active system onto a planet in that system other than Mecatol Rex; if the planet contains other players' units, place your ground forces into coexistence.

1in the deck
–chance to draw
Nocomponent action

Source: Thunder's Edge