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

Core Mine

If you have at least 1 mech on this planet, or if you remove 1 infantry from this planet, gain 1 trade good.
Exploration card – Hazardous

Hazardous

If you have at least 1 mech on this planet, or if you remove 1 infantry from this planet, gain 1 trade good.

3in the deck
–chance to draw

Source: Prophecy of Kings