 It adds components for a sixth player, more cards and goals, and direct player interaction in "takeovers" of other players' military worlds; players who refrain from playing certain cards are immune to conquest.Takeovers are optional and the rules for this expansion encourage trying the game both with and without them.This set also introduces many new Rebel and Imperium Cards and introduces a special 2 player scenario where one player takes the role of The Imperium while the other starts with a Rebel homeworld.