After 6/7 tries I finally beat the SPOILERFour Kings at level 34. I just couldn't wrap my head around on how to dodge their attacks, so eventually I used Iron Flesh to withstand the damage and hit them with every pyro I had. Fire Whip dealt a surprising amount of damage.

I've also opened the shortcut to Lost Izalith and made preparations to keep Solaire alive. I might even go and try beat the Bed of Chaos at this level. Getting the advanced sorcery from Big Hat in the Dukes Archives is another priority on my list.