The Brewing Tempests
Deo is believed to be a god who arose from the earth; it is taught that he organized the world from chaos, and humans were made from clay; it is heretical to say humans were made from the divine flesh of Deo. The clergy acknowledge the existence of the gods of other peoples, but see them as subordinate. Worship of Deo is not strictly enforced among other peoples, although it is encouraged.
In general, the Deo doctrine is focused on military domination, and to a lesser degree, subjugating the people they conquer. The religious hierarchy is linear, weak, and religious roles are generalized. Primary functions are to interpret divine messages, provide spiritual protection, and often teach. The clergy is well integrated into the military and members are not trained in politics.
During the Kandari invasion, most of the top clergy were executed with the members of the Derosi senate, and after the Derosi surrender the Kandari destroyed as many of the Deo texts as possible. While the original teachings of Deo emphasized service and kindness, they have been supplanted in the mainstream by a new oral tradition of duty and revenge that is spread throughout the Republic by mystics; it is not uncommon for there to be a blend of the old and new traditions, with one example being the Burning Fists supporting a sect that preaches service and revenge. The Deo clergy preach that the Kandari trample the land instead of caring for it, using it as an allegory for their own subjugation by the Kandari.