Each of them is trained to listen to one of the five types of spirit and they are trained to interpret the needs of those spirits as well as to petition them for aid should the people require it. The bo'udgan do not live separately from aviansie society, but rather they live among them. They perform normal jobs as well as perform their spiritual service, it is an additional responsibility, rather than a complete vocation. E.g. a bo'udgan that works as a hunter, will hunt as much as a normal hunter, but will listen/talk to the spirits as they do so. Spirits are respected, not worshipped.
The five spirit types correspond to an aspect of life/balance within the world and within aviansie society.
Water spirits are the spirits of beginnings. They are the spirits of creating and sustaining life. They encompass aspects of fertility deities as well as traditional water roles.
Earth spirits are the spirits of sustained growth and survival. They are the stoic tree spirits standing against the storm and they are the spirits that keep buildings standing. They offer gifts of good health and stability.
Light spirits are the spirits of knowledge. They reveal the secrets of the universe to those with the patience to look. They promote education and the betterment of self for the benefit of others.
Fire spirits are the spirits of passion and emotion. They are the song in the throat of a musician and the rage on the field of battle. Fire burns, but it also illuminates. Spirits of light and fire are often linked.
Storm spirits are the driving force behind the world. They are the inspiring words from great leaders. They are the winds beneath the wings of an aviansie carrying them to new places.
It is the responsibility of the bo'udgan to maintain dialogue with the spirits. To tend their shrines and protect their sacred places. In exchange the bo'udgan are believed to possess spirit like powers.