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

Awakened Planetoids

Your planets in the active system participate in space combat if that system contains 1 or more of your ships, and ground combat on themselves if they contain 1 or more of your ground forces. Your planets cannot be assigned hits and have a combat value equal to 10 minus their resource value, minimum 1.
Zelian PurifierBreakthrough

Your planets in the active system participate in space combat if that system contains 1 or more of your ships, and ground combat on themselves if they contain 1 or more of your ground forces.

Your planets cannot be assigned hits and have a combat value equal to 10 minus their resource value, minimum 1.

SynergyWarfareBiotic

Source: Discordant Stars