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

Covert Strike Teams

At the start of a ground combat, you may roll 1 die for each of up to 2 of your ground forces on that planet. For each result equal to or greater than that unit's combat value, produce 1 hit; your opponent must assign it to 1 of their units on that planet.
Free Systems CompactTechnology – Cybernetic

Cybernetic

At the start of a ground combat, you may roll 1 die for each of up to 2 of your ground forces on that planet.

For each result equal to or greater than that unit's combat value, produce 1 hit; your opponent must assign it to 1 of their units on that planet.

Prerequisites: CyberneticCybernetic

Source: Discordant Stars