Yuntali once bent around the Valtherion Empire. It began as a single clan of arcane sorcerers and became the greatest power the world has known. The arch-mages of Valtherion could throw workings across a thousand miles, and their rites moved the course of rivers.
The concepts that made such workings possible could not be taught or inherited. In time the arch-mages found that their hands still knew the old shapes but their minds could no longer hold them. The Patron offered his covenant then. The Empire would bring him the souls it could no longer shape, and he would shape them in the Empire's service. A portion stayed with him. The rest returned as power.
From that covenant rose the Church. What Valtherion held by crown and law, the Altar holds by contract and rite. The rolls only grow. The Patron's hand has never slackened.