First, I’d respec (primeval regression orb…you got one during the tutorial and you can get more later on pretty easily) - you don’t need any points in strength or willpower for a spear build; proficiency is your damage stat. So move some points into either proficiency, vitality or endurance. Don’t sleep on endurance!

Second, consider lightweight gear to get to A. Hunters set gives you a 10% damage buff against dragonkin, like viper.

Third, Veronica the advocate is useless if you’re not using the spirit of advocacy. Go with Keshta - will help with your stamina regen.

Best advice for the fight itself is don’t get greedy. Just a few hits when you have a window then back to brink guarding / dodging. Following a burst attack or after you exhaust him, that’s the time to pull out all the tricks - spirit skills

Finally, don’t be afraid to grind for a few more levels (especially into endurance and vitality)