Titled Twilight of the Arnor, the new content acts as the final chapter in the series' Dread Lord wars. It adds a new campaign, the star-destroying Terror Star unit, new technology trees, new ships to the game, along with a new 3D map editor, new scenario editor, new campaign editor, a bigger galaxy, and more.

Requiring either Galactic Civilizations II: Dark Avatar or Galactic Civilizations II Gold Edition, Twilight of the Arnor will be available in November at $29.99 and can be pre-ordered from TotalGaming.net for the reduced price of $24.95.