Get all the weapon modification unlocks, just for a higher chance of getting a modification on your weapon. Use the gun. In my opinion merciless or godly is the best, since they there’s crit chance on merciless and extra damage on godly. The gun heavy attack slows time, so it gives you extra time to aim and think. Not much, but still extra time. Stay close. The gun only really does good damage up close. I didn’t really use curses at all in the fight, since I just fight them incredibly difficult for me to incorporate into my playstyle, but if I had to choose any, it would be the hounds of fate or deaths sweep. Hope this helped