Dolurrh

Dolurrh, also known as the Realm of the Dead, is the plane where the souls of most mortals go when they die. Neither a reward nor a punishment, it is a place of apathy, torpor, and eternal tedium. People who visit will eventually be overcome with hopelessness and will slowly wither and fade, ultimately turning into a shade that will wander this lifeless, gray realm for eternity.
The Harvest of Pain, a blasted wasteland on the continent of Argonessen, is a manifest zone of Dolurrh. In Q'barra, many animals travel to the Ivory Mountain to die. Scholars from Morgrave University believe that there is a manifest zone to Dolurrh either near or within the mountain. Many believe the ghosts that come out of the pitch black waters of Lake Dark in Karrnath do so because of a Dolurrh manifest zone.
When Dolurrh becomes coterminous, spirits pass easily into the world of Eberron. Spells designed to resurrect people become more potent, often inadvertently bringing back the wrong soul or even a demon inhabitant of the plane. Dolurrh is coterminous once a century for a duration of exactly one year.
When Dolurrh is remote, resurrection spells become erratic and usually fail. It is remote once a century, for a duration of exactly one year, and exactly fifty years after being coterminous.