The novel (I believe the first in a trilogy) had multiple story lines including a young woman who has been handed from the chieftain (who dies) to the chieftain's son who is abusive. She has visions of the future and when she is pregnant, she runs away and leads a group of people across a mountain? There are also evil hounds loose and the veil between the worlds is thinning. The male protagonist is a shapeshifter (bird and wolf) who is at an island magic school. There is an attack on the island school and a major battle toward the end of the first book.
I read it about three years ago (2017). I think it was part of a trilogy. It was a hardback book, I think. The male protagonist was a shapeshifter (bird and wolf in this book) as well as other magic. The hell from which the hounds came from was not Christian hell, but more like evil or death.