He isn't too difficult, the main thing is he has a lot of health. When you get him to around 60% health he'll go into phase 2 and a cutscene will play. He is kind slower now, but he'll use crossbow ...

This massive fort can be accessed either by heading west of the Smoldering Wall Site of Grace or south of the Forsaken Ruins and hitting the Fort Gael North Site of Grace.< Just from afar, you'll see ...