Transitive Planes
These three Transitive Planes have one important common characteristic: each is used to get from one place to another. The Astral Plane (although technically an Outer Planes) is a conduit to all other planes, while the Ethereal Plane and the Shadow Plane both serve as means of transportation within the Material Plane, which theyāre connected to.
These planes have the strongest regular interaction with the Material Plane and can be accessed using various spells. They have native inhabitants as well.
Transitive planes have one important common characteristic: they āoverlapā with other planes, and as such can be used to travel between these overlapping realities. These planes have the strongest regular interaction with the Material Plane and are often accessed by using various spells. They have native inhabitants as well. Example transitive planes include the following.
Ethereal Plane
The transitive plane known as the Ethereal Plane is a ghostly realm that exists as a buffer between the Material Plane and the Shadow Plane, overlapping each. A traveler in the Ethereal Plane experiences the real world as if the world were an insubstantial ghost, and can move through solid objects without being seen in the real world. Strange creatures dwell in the Ethereal Plane, as well as ghosts and dreams, many of which can sometimes extend their influence into the real world in mysterious and terrifying ways. Powerful spellcasters utilize the Ethereal Plane with spells like blink, etherealness, and ethereal jaunt.
Shadow Plane
The eerie and deadly Shadow Plane is a grim, colorless āduplicateā of the Material Plane. It overlaps with the Material Plane but is smaller in size, and is in many ways a warped and mocking āreflectionā of the Material Plane, one infused with negative energy (see Inner Planes) and serving as home for strange monsters like undead shadows and worse. Powerful spellcasters utilize the Shadow Plane to swiftly travel immense distances on the Material Plane with shadow walk, or draw upon the mutable essence of the Shadow Plane to create quasi-real effects and creatures with spells like shadow evocation or shades.
Astral Plane
A silvery void that connects the Material and Inner Planes to the Outer Planes, the astral plane is the medium through which the souls of the departed travel to the afterlife. A traveler in the Astral Plane sees the plane as a vast empty void periodically dotted with tiny motes of physical reality calved off of the countless planes it overlaps. Powerful spellcasters utilize the Astral Plane for a tiny fraction of a second when they teleport, or they can use it to travel between planes with spells like astral projection.