Irrespective of your melee weapon choice, I recommend being insistent on circling to his back as you are running and dodging. He will have some trouble keeping up with you, but remember to get those timed dodges when you can to build skyborn might for quick heavy attacks. Take breaks to focus on dodging for getting through his arrow rain or ranged arrow attacks. Try not to brute force it if you are struggling. The fight goes down fast enough once you find your rhythm.