Experience the new features and improvements in the world of Galactic Civilizations with Altarian Prophecy. This expansion adds two new alien civilizations, each with its own AI engines. You can explore the history of one of these new civilizations in a new campaign, where you'll use dozens of new technologies, ships, and planetary improvements. The game also features a scenario editor, which lets you design your own custom maps, and a campaign editor, which lets you create your own set of games.