Knowledge Unending — Meg Hendry

The gods and the entirety of the Sancta have turned against Rien, Halbert, and Eiva. The three of them join Frida's search for Andred, but they must also find out what the King of Acra is up to. Despite what the king did against Mortua, he appears to have become very loyal to the Goddess of Knowledge and to have righted his ways. Rien and his allies know there's more to it than that. Mortua and her most loyal priest know it too. Knowledge Unending is a novella.