My shred druid stomps 60 easily.
Anything that does damage to crowd control enemies doesn’t work on bosses. Always keep that in mind with your aspects. For example Druid’s Changling aspect that does extra damage to Crowd Control enemies helps with getting through the dungeon, but I only tickle the boss. Gotta find damage that does damage to all. Stay away from elite damage as well, because that doesn’t work on bosses.
Look up a build on Maxroll or Mobalytics. Simple changes to the paragon makes a huge difference too.