Yeah work on those upgrades.It didn't work for me. I fought that thing for almost an hour. I was down to 60 health with no potions or medicine stash. the fire arrows got it to expose it's weakness but I kept attacking it with those same arrows when I should have been switching. I was gonna die so I figured I'd try the sniper bow and I barely killed it before it was gonna kill me. the entire room was destroyed so I had nothing to hide behind. I just spammed the roll to get away from the missiles.
maybe it also doesn't help that I'm using the armor the guy gave me for free at the beginning of the game.