This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Speak with Nara Wildmane.
I entered the land of dreams, and dreamed of a cult of druids who dwell in the Wailing Caverns. I saw that their goals were once noble, but they have lost their way. They are now servants of the taint seeping through the Barrens.
I am old and my strength fails. I could not long dwell in that dreaming place and know little more of the tainted druids. But Nara is young and her spirit is fierce. She remained in the dreaming when I fled.