The Dreaming Dark

In the spaces between sleeping and waking, nightmares wait with grasping claws. The quori spirits that rule Dal Quor spent a thousand years seizing control of the continent of Sarlona. Now they have turned their many eyes toward Khorvaire. The ultimate goal of the Dreaming Dark is to control all the nations of the world. The plane of Dal Quor goes through cycles of light and darkness, and the current age is coming to an end. The nightmare spirits that rule the plane believe that by seizing control of mortal civilization — by forcing all the people of Eberron to dream the dreams they devise — they can maintain this current age of darkness indefinitely. So the fiends of the Dreaming Dark aren’t merely hungry for power; they are fighting for survival.

In our story:

The party has not (knowingly) encountered a member of The Dreaming Dark. While meaningful dreams have been limited up to this point, they have all seemingly come from other sources.

The Role of Dreams:

Dreams are a means of communicating from Dal Quor to the material plane. Many entities that reside beyond the material plane (and some that are able to flow freely between the planes) have manipulted this connection to communicate with their mortal denizens. Even creatures that rarely sleep, such as elves, have been connected to in this fashion.
Though most dreams have been used by planar denizens as a means of guiding mortals, it is just as likely to be a form of manipulation.