Oathbreaker is about Torak's revenge on Thiazzi when he murders Bale, Torak's bonekin. I thought that Torak's revenge was a bit over the top, maybe he went just a little to mad. I liked how that Thiazzi tricked the Deep Forest clans to thinking that he was the Forest Horse mage and the Red Deer mage. I thought that was very clever, I didn't expect that at all. I loved how at the end that Wolf mates with Darfur and has pups, but I didn't really like how he abandoned Torak and Renn to find Darkfur. Their pack is not complete without Wolf.
But other than that I thought it was a really good book. Definitely recommend it!