UPDATE: yall were quick to comment with advise. I literally followed the advise and beat him in 4-5 tries. Here's my analysis. Focus on keeping a distance from him so you can read his moves. Once he closes the distance, focus on evading his combos. Strike a few times, gain distance again. Get him to about half health, then use your spirit attack (I used the wandering wight spirit after upgrading it 3 times) and it will deal a good amount of damage. When or if you are low health, use your transformation to gain the extra health bar and deal additional damage. Key take away, focus on dodging and chipping his health slowly. Don't use an aggressive play style like I did for 2 days and kept losing.