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

Ambush

At the start of a space combat: You may roll 1 die for each of up to 2 of your cruisers or destroyers in the system. For each result equal to or greater than that ship's combat value, produce 1 hit; your opponent must assign it to 1 of their ships.
Mentak Coalition originAbility – Warfare

Warfare

At the start of a space combat:

You may roll 1 die for each of up to 2 of your cruisers or destroyers in the system. For each result equal to or greater than that ship's combat value, produce 1 hit; your opponent must assign it to 1 of their ships.

1in the deck
–chance to draw

Source: Twilight's Fall