I'm gonna be the asshole who tells you they beat him in only 2 tries. I found I could reliably dodge his DFA attack by sprinting and then rolling, while looking up to time my rolls better.
I'll be an asshole right there with ya buddy.
L2 strikes with Ludwig's sword while straffing to the sides of the spider minions will dispatch them in one shot. Then just go beat on Rom until death. Just take your time, it's a surprisingly leisurely fight.