Star Wars Empire at War – FOC Alliance – Revolt feature
I added the past summer this feature but probably never I showed it in a normal GC playing.
In essence this feature is activated when you conquer the capital planet from a faction and it gives to that faction 5 or 4 planets with a big amount of units. These planets could be before in your hands and you must recover them. Obviously the enemy with that amount of planets and units can spread around your planets as a big infection and probably you need center your efforts at turn off the fire. More funny can be if there are other factions active at the same time.
The point is give an additional challenge in the end of the game where it can be bored by the lack of enemies.