Andrenach is one of The Watchers of Ardera, an eternal dragon representing wisdom and archivity. He is the embodiment of air and winds. His form is a green feathered colossal dragon with 4 white wings and burning red eyes.
Andrenach is an alter ego of Xelath Thalodan, who in fact is Xelinarth the Dreamwalker. Andrenach grants Xelath protection in the form of armor during his time on Rhea, and also reunites with him in the Last Battle.