The Other Side of Faerun
The Shadowfell is the eternal resting place of all mortal souls, and, is marauded by a pervasive melancholy which seems to cloak the entire plane with a thin veil of darkness. Even when the sun rises in the mornings, nothing ever seems as bright as it does in the mortal realm, as there is a constant gray haze that covers everything. This is the domain of the Raven Queen and her followers, the Shadar-kai. She leads her followers in the caretaking of mortal souls, and uses them whenever she needs to bring a soul to her realm that refuses to come willingly.