Keeper Remulos at Moonglade has instructed you to enter the emerald dream and recover 3 Emerald Acorns. Leave the vicinity of the Shrine of Remulos to return to Azeroth.
What we need exists only in the emerald dream... acorns that are infused with a powerful restorative magic. Many places in this sacred glade are closely tied with the dream, and my shrine is among them.
I will send you into the dream to recover some of these acorns. Be prepared though [class], for this method of entering the dream is dangerous, and it is very likely you will be beset by nightmares.
Recover a few acorns quickly, and then depart from my shrine or pinch yourself to return to our world.