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

Valiant Genome

Courage

After a player's unit is destroyed during combat: You may exhaust this card to roll 1 die. If the result is equal to or greater than that unit's combat value, their opponent must choose and destroy 1 of their units.
Last Bastion originGenome

After a player's unit is destroyed during combat:

You may exhaust this card to roll 1 die. If the result is equal to or greater than that unit's combat value, their opponent must choose and destroy 1 of their units.

1in the deck
–chance to draw

Source: Twilight's Fall