Okay, this is how i killed him
-Full padded armor
-frostner (yes it is perfectly viable)
-fire potion
-medium heal potion
-medium stamina potion
-bonemass buff (which i didn't even use)
-Serpent stew
-Lox pie
-Blood pudding

Just smack him, his attacks are very predictable, when he is using his meteors.... just walk away, they miss. Don't run, don't jump, don't dodge, just walk away. His fire breath is only used from a distance and his flame wall thingy does abysmal damage with a fire pot. There ya go, you've won.