From the introduction:
The Godkinds have fallen, save one, Bellona. She works tirelessly to destroy the veil created by the group of defected wizards, Terminus. Sergius works with Terminus to abolish magic in the world and with it the corruption its influence has wrought upon its wielders.
Now, the Champions have united in a final defense of Bellona as the armies of faith stand ready to extinguish the light of magic once and for all.