Got him first try on an absolutely RNG-carried run. Had Radahn's Swords, jellyfish shield, a lightning weapon and grease, and two good damage negation talismans.
Buddy was playing recluse, and a random wylder who was pretty decent.
He only got two nukes off. I suspected the dotted line was were he was aiming it so i ran away from it first time, couldn't get away from the 2nd nuke so i shield-blocked it and only lost about 20% health.
Wylder died to the crazy twinblade combo but we got him up instantly with an ult. Only death in the fight.
Only used 2 flasks. IMO overall way easier than gigadel.