Galactic Civilizations II: Twilight of the Arnor is the second expansion pack to the turn-based strategy video game Galactic Civilizations II: Dread Lords. It added new features such as: The ability to destroy solar systems with massive ships called "Terror Stars" Unique technology trees planetary improvements and weapons for each civilization A map pointer and custom scenario editor New graphics that reduce graphic memory requirements by over 90% and a new map size that allows for games that may take millennia to complete