At max level the build does much better with mobs than bosses as it focuses on killing enemy to gain momentum. If fighting bosses it's better to use the quickening amulet. I was too lazy to parry him in the first phase and didn't even bother to try to fight in second phase (just keep getting hit and it'll end soon). The third phase is interesting as there are many particle effect attacks that would blind you and confine your movement. I just took it slower and properly parry him a couple times. Still the build isn't as optimized as I would have liked so maybe players can try out different accessories to see if that would improve combat flow.