Shadow Of The Rift adds several new game morphing mechanisms to Eclipse, including Time Distortion, Evolution and Anomalies, as well as several new Rare Technologies, Developments and Discoveries. It includes two new player boards with three new different alien species from which to choose. Due to its modular design, you can use all of these additions or just some of them in any game of Eclipse according to your preferences and play style. The expansion does not require the Rise of the Ancients expansion, but is fully compatible with it.
Unfortunately there aren't any reviews of Eclipse: Shadow Of The Rift yet, but why not check out this un-boxing to see what you get inside!