From the back of the book:
The battle has been won, the demon dactyl driven from the land. The heretic De'Unnero has been cast down, his followers slain or forced into hiding. A new king sits on the throne, a new Father Abbot takes the reins of the mighty Abellican Church.
But all is not well in the land of Honce-the-Bear...
From the introduction:
Welcome to Corona, the world of DemonWars: Reformation. This book contains all the rules you need to play a DemonWars: Reformation game. This chapter explains what you’ll need to get started. DemonWars: Reformation is not a board game - it is a Tabletop Role-Playing Game, designed for two to eight players.