When the Titans came to the planet Azeroth and freed it from the grasp of the Old Gods, they decided to reshape it to make it more habitable for the mortal races that would soon develop upon it. But before they did this they created the Emerald Dream which served as the blueprint for what they were going to accomplish. But since the Titans invested a lot of time working on perfecting the design of Azeroth, the Dream itself is made up of layer upon layer of these earlier unfinished, or flawed incarnations.

The Dream itself is covered with deep forests, free from any sentient races interference. The Green Dragon Aspect, Ysera, was placed in charge of watching over the Dream and Azeroth after the Titans finished with their shaping. Four portals into this plane exist in Azeroth. They are located in Duskwood (Twilight Grove), Feralas (Dream Bough), The Hinterlands (Seradane) and Ashenvale (Bough Shadow). A fifth portal into the Dream is located in Crystalsong Forest in Northrend. The Green dragonflight guards these portals jealously in order to prevent any mortal from entering the Dream. However, The Dream has become somewhat tainted and is now referred to by several NPCs as the “Emerald Nightmare.” It is rumored that players will be able to enter the dream in a future expansion of World of Warcraft in a similar manner to the ability to enter Draenor.