The Aether is the 5th dimension. It is very dark and star-filled with islands of Aetherstone. The primary mode of transportation is a "Spectral Raven" which is a very fast chicken-like bird. It can be tamed easily with beetroot or sugar. It is hard to travel between the islands without these because of the long distances.
Many different races tend to inhabitant the larger islands. The most common are the Sahagan, fish people, and Aerakkoa, bird people, who are mostly peaceful but are perfectly capable of defending themselves.