Travel to Feralas and speak with Konu Runetotem at Camp Ataya.
You are truly brave to help us protect these lands, hero. If you wish to do more for the wilds, there are others in need of your aid.
The verdant forests of Feralas lie to the south. There, in the shade of the mighty Twin Colossals, you must seek out Konu Runetotem. He has found signs of a disturbing illness.
Follow the road west around the Twin Colossals to find Camp Ataya. Go in peace, <name>, and walk with the Earth Mother.