The Shadowfell, also known as the "Plane of Shadows," existed as an 'echo' of the Prime Material Plane, and is dark and terrible place of negative energy and evil forces.

As a parallel plane to that of Corwyn, the geography of Shadowfell is similar, though not entirely identical, to the geography of the world of Oris.

Arcane magic was much more powerfully in Shadowfell than iCorwyn, and many of its inhabitants were powerful undead creatures. An entire region of Shadowfell is known as "the Mistlands."