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 one 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.
Progress
Keeper Remulos says: Welcome back to the waking world, child.
It is good to see that you are safe. Have you recovered the acorns?
Once you accept, Remulos will buff you with his spell "Fitful Dream: Immersed in the Emerald Nightmare. Right-click to pinch yourself." Story-wise, this puts you to sleep and your dream self enters the affected Emerald Dream. Game-wise, you simply fall asleep, phase into a green fog that covers the Shrine of Remulos and return to a standing position.
Don't go too far. The ring of elite Nightmare Aberration around the area is the boundary of the phased area. Getting too close to them or right-clicking off the buff will send players back to Remulos. If you accidently do, you can ask him to reapply the buff:
Please send me into the Emerald Dream to recover the acorns. I know of the danger and I do not fear it.
You should also beware of the Nightmare Figments which turn into a shadow version of the player they are attacking.