On behalf of the Cenarion Expedition druids of Evergrove, and the indigenous life of the Ruuan Weald, Tree Warden Chawn has asked you to slay Maxnar the Ashmaw. Return to him at Evergrove in the Blade's Edge Mountains after you have done so.
They've left us no choice, [player]. It's time to put an end to the threat from the Blackwing Coven by taking out their leader, Maxnar the Ashmaw.
I don't know if you caught a glimpse of him while you were in there, but he's one of the dragonkin, half-man, half-dragon. And he's tough, so don't underestimate him!
Finish it quickly and with any luck you'll secure the safety of Evergrove and the Ruuan Weald.