The Great Cleric: Volume 11 (Light Novel) by Broccoli Lion

Luciel and his comrades have defeated Dongahar and his demonified men, and the Church of Saint Shurule is safe—for now. But there is no time to rest, as the fight is far from over. A letter written by the traitor himself tells Luciel all about the demonification experiments Blanche and Illumasia have been carrying out, and much to the masochist sage’s dismay, he can no longer delay his journey to these nations.

To survive the trials ahead, he’ll need new allies, starting with a certain magic artificer he’s been meaning to recruit for some time. But the real dilemma lies in choosing where to go first: the dukedom of Blanche—Lumina, Nadia, and Lydia’s home nation? Or the Illumasian Empire, which has been causing Luciel nothing but trouble from the start?

If it were up to him, Luciel would steer clear of both, but alas, the world won’t save itself!