This strange mixture of worlds was created by a huge, corrupted moonstone. The valley of Eodon was actually on Earth, but the moonstone somehow put it out of phase, making it inaccessible and unmappable. Dr. Rafkin first put forth this hypothesis, which was confirmed by a Xorinite Wisp. Only the Orb of the Moons allowed travel into the valley. The valley was threatened to be destroyed by the corrupted moonstone in the hands of the Myrmidex Queen, but thankfully the Avatar was able to prevent this disaster and destroy the threat of the Myrmidex as well.