This expansion appends to the usual setup and game play rules. Each aspect of this expansion pack (Governors, Objectives, Envoys, and Boon of Ra) is modular and may be added to your game individually, all together, or in any combination. The governor cards give a Governor a special privilege to use during play. The objective cards describe a certain configuration of monuments that will, if achieved, give a Governor bonus glory points at the end of the game. The Boon of Ra card modifies that Governors build action for the remainder of the current season. Envoys reserve terrain section or city spaces for your use in a later action. -description from publisher