Werewolves are, by their nature, somewhat spiritual beings. While humans look to the stars to see their fate, werewolves look to the moon under which their first change occurred. They believe that this is a direct response to the werewolf's personality and further guides them down their path in life. As the moon has five distinct phases, so a werewolf will be assigned to one of five different sets when they change. Additionally, whether the moon is waxing or waning will affect a were, except on the phases of new moon and full moon.
The Phase that a werewolf is associated with determines which Gift they will find themselves able to use, and also requires them to Shift into their wolf form during the three days of that Phase.