People are exaggerating by comparing it to Sister Friede, but this boss is indeed annoying. My tip is to do your best to prevent it from becoming a gank and to use the boss arena to your favor. In the start, the small wolves will come at you one by one, before the champion reaches. They have a tendency to try to circle you, so stay in the narrowest part of the path and kill them one by one. Don't play footsies with the human gravetender, keep your shield up and counterclockwise circle strife him to chain backstabs. Try to finish him off before the big wolf comes down, or you are in for a bad time. With the big wolf in, you can stay behind the columns to heal or hide from his charge. But you will eventually have to leave to actually deal some damage to him.