The Shadowfell

The Shadowfell is a plane of existence that is a nexus of entropy and necrotic energy. It forms one third of the Central Planes, the other two thirds being the Material Plane and the Feywild. The Shadowfell is a dark, desolate, and deadly place, covered in unnatural shadows. It is the source of the necrotic energy that fuels the undead and creatures of darkness. Magic is weaker in the Shadowfell than on the Material Plane.