The "King" enemy needs severe rebalancing. The only build that stands a chance of beating him is an archery build due to his spikes and regen. Basically, if you get bad RNG and he's the boss and you're not a ranged build, you might as well restart.
He actually wiped my archer, because the spikes trigger per arrow. I got past him with block and whetstones without much trouble on the next run. I think he's well made for end game.
Arrows don't trigger damage on spikes, though. I was able to kill him with an archer build because of that, unless the most recent patch changed it of course.
