Best end-game boss class/mob class out of these 5?

So I see.

And speak of the devil, I didn't see she brought a DrK mule with her; nor did I see she had 45k HP buffed. That's what I get for viewing the Empress solo on my phone. Admittedly, the solo is less impressive now. Still quite something nonetheless to have so much HP she can honey badger most of the gimmicks. I assume for the alchemy pots she's using two +5,000 HP pots, or they can't stack like that?

Don't be discouraged though: Mechanic is probably the most fun class I've ever played next to DrKs ;p. They're amazing in parties, just not terribly great solo.