For the undead monster, see Shadow.
The Shadow Plane is a Transitive Plane. It is a plane in between darkness and light, always in a state of dusk.
In Planescape the Shadow Plane was only a Demiplane, speculated by some as being a sort of Quasielemental plane between Positive+Energy+Plane and Negative+Energy+Plane.
When D&D 3rd edition was released the Shadow Plane was transformed into a full-fledged Transitive Plane that connected different cosmologies with one another.
Denizens of the Plane of Shadow include:
Krinth
Shadow symbionts
Shadar-kai
Shadowswyfts
Shadows
Dark ones
Dusk beasts
Veserabs
Shadow+demons
Shadow+dragons
Illumians
Beacon moths
Darkness+pseudo-elementals
Shadow+mastiffs
Shadow+jellies
Slow+shadows
Cloakers
Ecalypses
Darkweavers
Umbral banyans
Nightshades
Shadow spiders
Shadow asps
Gloamings
Shadelings
Greeloxes
Khayal
...and various other shadowy creatures, including the literal, non-undead shadows of creatures from other planes, both sentient and not.
Additional resources:
d20SRD on the Shadow Plane
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