In the third book of Tasakeru, a sadistic monster born from the broken body of an Outcast wolf goes on a horrific rampage through Sankami.
The third book of Tasakeru, by Brian Stanley.
Not all of those exiled to Tasakeru are heroic or misunderstood... a few become Outcasts for very good reason. Such a sentient arrives one summer night, intent on nothing but satisfying his twisted desires. When he is caught in the act and dealt a mortal blow, the young wolf undergoes a terrifying transformation into something not quite alive and not quite dead. Taking on a new name and a mission of vengeance, the creature called "the Soulsnatcher" carves a swath of destruction and violence through Sankami, in search of blood and souls.
The other Outcasts must band together to stop this seemingly indestructible foe, with assistance from both the militant church of the Silver Order, and from the most mysterious Outcast of them all: the ancient white wolf known as Drake Who Walks Alone.