Plane of Shadow
In first edition AD&D, the Plane of Shadow was the largest Demi-Plane of the Ethereal Plane.
The Plane of Shadow is a dimly lit dimension that is both conterminous to and coexistent with the Material Plane. It overlaps the Material Plane much as the Ethereal Plane does, so a planar traveler can use the Plane of Shadow to cover great distances quickly.
The Plane of Shadow is also conterminous to other planes. With the right spell, a character can use the Plane of Shadow to visit other realities.
The Plane of Shadow is a world of black and white; color itself has been bleached from the environment. It otherwise appears similar to the Material Plane.
Despite the lack of light sources, various plants, animals, and humanoids call the Plane of Shadow home.
The Plane of Shadow is magically morphic, and parts continually flow onto other planes. As a result, creating a precise map of the plane is next to impossible, despite the presence of landmarks.
- Dusk Beast: A human-sized, two-headed lizard composed of dark shadow.
- Ecalypse: Equine creatures that gallop across the Plane of Shadow in great herds.
- Umbral Banyan: Dark trees at the heart of many a dangerous forest.
Shadow in d20 Modern
In the Urban Arcana and Shadow Chasers campaign settings, the plane of shadow is simply known as Shadow. Due to an unknown reason, creatures from other material planes (as in Dungeons and Dragons Campaigns) can be randomly ripped from their current plane of existence, and deposited on Earth with no memory of their previous home, and fluency in the local language (which is always the same as Common). This is called The Gift of Lethe.
- Plane of Shadow, D&D Glossary
- UO-Planescape: Plane of Shadow (Italian) page from Planescape Italian fansite