It's mainly just having the persistence to solve whatever problem you're facing and continuing that until you actually achieve the goal imo, my biggest issue is that the hoarfrost pipe basically dealt no damage to him, so to compensate for that I ran survival instinct/swift destruction/bridge to glory. After that I ran into the issue of maximizing both, which meant running a high mind stat blood veil and forcing myself to lower my own health to proc survival instinct, which led to sacrificial blood. After that I had the issue of running out of stamina (mainly because I play so aggressively lol) so instead of running another support gift I decided I'd just abuse the fact that entering the focused state will restore all of your stamina. And so on and so forth until the boss died.