Lvl 70 Dru ~2k AA, 70 Ench ~500 AA, 74 Sham ~2k AA.
74 tank merc, used 2 70 heal mercs. No one got under 90% hp.
Slow and steady, I just spammed barkspur on tank. Stay at range on treant, when the adds pop they'll aggro tank. Use HoT's and reptile to keep heal aggro down. Dont cast any AEs on the trees, just let tank hold aggro with DS on. Can do what you want with the Dryad, dot the crap out of her. No need to burn, just steady DPS. IGNORE HER DOT, stay out of ramp. Was not hard~