Commonly referred to as "the Oak," the constellation Fervanis is generally represented by a towering tree with leafless branches. Many scholars believe this is a representation of nature that harkens back to the lore of the early Neromenians, whose beliefs largely aligned with animism, prior to the rise of Old God worship and the creation of the Tevinter Imperium.
Others, however, believe Fervanis was originally a constellation of the elven people - specifically, a depiction of Andruil, goddess of the Hunt. "Vir Tanadhal," or "Way of Three Trees," is a central tenet of Andruil, and some think that Fervanis originally represented this concept.
—From A Study of Thedosian Astronomy by Sister Oran Petrarchius