The Vallas are the three highest-ranked Skandian gods. They are also the gods of vengeance and appear in the form of a bear (Gorlog), a shark (Thurak) and a vulture (Hergel). They also all have a human form, all with long teeth and horns.
A Vallasvow is an oath of total vengeance. The curser does not only promise to kill the victim, but his whole family. If the curser does not succeed in this, the Vallas will kill all of his family.
Oberjarl Ragnak sworn the Vallasvow against King Duncan of Araluen, but he forgave the Araluans and died at the Battle of Hallasholm.