I can take the stone monoliths out with my ranger and nurture druid alone Not too hard with end regen pots on the ranger and MCL / mana pots on the druid.
Classic tank group works a treat too, so long as you've a nurture druid for fire resist and buffs. 51% fire resist on my buffed ranger btw, you really really need it
As someone else said, they occasionally teleport (throw) you, so if you focus pull you may have the comedy situation of seeing a pet or chanter getting chucked about a bit =)
I'd recommend a FG. The bottom line for a FG is you need 3 peeps tanking (they come in 3s for a FG), bard for end + nurt druid for fire resist / buffs. The other 3 can be whoever, it doesn't matter, you'll be killing them steadily with just those first 5. Crush weapons / arrows are the preferred damage type.