Skinwalker
*meows in an empty room*
Yeah, but I haven't encountered any actually difficult bosses since the shadow of Elias in the capstone dungeon. Not counting the Butcher and that bug demon that appears during helltides.I switched back to poison imbue because the chill/freeze bonuses don't work on bosses until they're staggered.
Even since I entered WT4 ten-fifteen levels too early, elite trios have been the biggest challenge (esp. the ones that shoot flames in every cardinal direction), and they're becoming increasing less of an issue as I wisely invest my paragon points.