The Ulimate Empire at War mod aims to bring the eras, or periods of time, to the game that were not in the original release of Empire at War. The mod includes new heroes, units, buildings, technologies, planets, and weapons. Players will have a chance to take control of the Dark Side or Light Side in a galactic campaign in each era, as well as the ability to train the Sith as the Dark Side, or Jedis as the Light Side. The Ultimate Empire at War campaign will also be available, which is a Galactic Campaign that spans every era of time in the mod, covering all material, units and heroes in the mod.
The Eras include: The Old Republic (25,000 BBY - 1,000 BBY), when the two major forces in the galaxy are the Republic and the Sith; Rise of the Empire (1,000 BBY - 0 BBY), when the Galactic Republic and Confederacy of Independent Systems are the two major forces; the Rebellion era (0 BBY - 4 ABY), which is already covered in the game; the New Republic Era (5 ABY - 25 ABY), when the New Republic takes over from the Rebellion, and the Imperial Remnants oppose them.