Shadowfell
The Shadowfell, also called the Plane of Shadow, is a gloomy dimension whose sky is a black vault with neither sun nor stars.
The Shadowfell overlaps the Material Plane in much the same way as the Feywild. Aside from the bleak landscape, it appears similar to the Material Plane. Travelers from the Material Plane who enter the Shadowfell often observe landmarks similar to the world they left, but distorted and often sinister. A mountain on the Material Plane might be replaced in the Shadowfell by a skull-shaped rock outcropping, a heap of rubble, or the crumbling ruin of a once-great castle. The forests of the Shadowfell hold sinister-looking trees, their branches reaching out to snare travelers’ cloaks, and their roots coiling to trip those who pass by.