Shadowfell

''The Shadowfell is the dark echo of our mortal world, a twilight realm that exists opposite of our own, similar, but darker, more ominous. As you may know, the Shadowfell is the destination of souls loosed from their bodies, the domain of the dead, the final stage of the soul's journey before moving onto the unknown.''

-Walter Lucason

The Shadowfell is a plane of existence that exists as a shadowy reflection of the mortal world. It is a cold, frigid land filled with terrifying creatures, including shadow dragons, shadow giants, a myriad of undead, and other creatures like The Entity.

Mortal souls are sent to the Shadowfell before moving on to their afterlife. Mortals who do not accept their death awake within the Shadowfell in corporeal bodies, and remain in these bodies until they accept their fate and become spirits.

The Raven Queen holds domain in the Shadowfell. It is also the homeland of the Shadar-Kai.

Shadow Crossings
The superstitious claim that the Shadowfell caresses the natural world wherever the sun cannot reach. That its entrances huddle in old closets, among darkened doorways, and the like. Common folk make signs against evil or whisper a quick prayer before continuing down dim streets for fear of the Shadowfell. And although it is true that people have stumbled into the Shadowfell by accident, these circumstances are exceedingly rare, and the places where the boundary between the world and the Shadowfell are thin, known as shadow crossings, are just as rare.