Dolgon is a hybrid of Spectrobe and Krawl known as a "True Dark Spectrobe" created by Krux, battled near the end of Spectrobes: Beyond the Portals After much research and experimentation "in the dark, distant corners of time and space," Krux had created Dolgon and its "sisters" Dolgan and Kragon out of both Krawl and Spectrobes to be the "ultimate creatures." After the pair are defeated, Rallen is forced to face the third True Dark Spectrobe, Kragon.