Monk's aoe is pretty bursty, but doesn't have a very high sustained. Elixir Field + Howling Fist + Rockbreaker every 3 GCDs is all you have. Of course you can always burn perfect balance and spam rockbreaker, but then your opener is most likely screwed on the next boss. Arm of the destroyer is also there btw... but the damage it does for the TP it costs is so godawful that using it makes me cry.