Eberron spins within its own Material Plane, enfolded by three coexistent transitive planes: the Astral Plane, the Ethereal Plane, and the Plane of Shadow, just as in the core cosmology.
Within Eberron’s Astral Plane, thirteen planes revolve in a complex orbit a round the Material Plane. Some have an elemental nature, some have ethical and/or moral tendencies, and others are simply alien worlds. These planes are home to all the extraplanar creatures found within Eberron. Furthermore, it has been rumored that there may be other "outer" planes which have not been cataloged by the sages of Eberron. If these hypotheical "Outer Planes" exist, they cannot be reached directly from the Material Plane. This could be a possible explanation for the stagnant souls in Dolurrh.
The thirteen orbiting planes are separate from each other, with no connections between them. They are coexistent with the Astral Plane, but separate from the Ethereal Plane and the Plane of Shadow, so certain spells (ethereal jaunt and shadow walk, for example) aren’t available to casters on these planes. As the thirteen planes move through the Astral Plane, their paths take them closer to the Material Plane at times and farther away at other times. A plane’s distance from the Material Plane is described in one of three ways.
Coterminous
On rare occasions, a plane comes so near the Material Plane that it actually touches it. At these times, it is possible to move freely between the Material Plane and the coterminous plane at certain locations on each plane. For example, when Fernia is coterminous to the Material Plane, a character can travel to Fernia by means of a volcano or any extremely hot fire—and the natives of Fernia can enter Eberron just as easily. Different planes’ paths through the Astral Plane bring them into a coterminous relationship with varying frequency: Fernia draws near fairly often (one month every five years), while Xoriat has not done so in over seven thousand years.
When a plane is coterminous to the Material Plane, certain of its traits may bleed over into the Material Plane, or at least into certain regions of the Material Plane. For example, when Risia is coterminous to the Material Plane, spells with the cold descriptor are enhanced in certain areas of the Material Plane. Not all planes have traits that spill over into the Material Plane.
Waxing/Waning
As a plane draws close to becoming coterminous it is called waxing, and as it moves away after a period of being coterminous it is waning. No special effects on the Material Plane occur when a plane is waxing or waning.
Remote
When a plane is remote, it is difficult to establish any connection at all between it and the Material Plane. When Fernia is remote, fire spells work less effectively, fire elementals are harder to summon, and it is nearly impossible to reach that plane via plane shift. Using plane shift to travel to a remote plane or using any spell to call or summon a native of that plane requires a Spellcraft check (DC 30 + spell level a character with 5 or more ranks in Knowledge (The Planes) receives a +2 circumstance bonus on this check.
| Plane |
Alternate Name |
Coterminous / Remote / Orbit |
| Daanvi |
The Perfect Order |
100 years/ 100 years/ 400 years |
| Dal Qour |
The Region of Dreams |
never / always / off orbit |
| Dolurrh |
The Realm of the Dead |
1 year / 1 year/ 100 years |
| Fernia |
The Sea of Fire |
1 month / 1 month / 5 years |
| Irian |
The Eternal Day |
10 days / 10 days / 3 years |
| Kythri |
The Churning Chaos |
erratic / erratic / erratic |
| Lamannia |
The Twilight Forest |
7 days / 7 days / 1 year |
| Mabar |
The Endless Night |
3 days / 5 days / 5 years |
| Risia |
The Plain of Ice |
1 month / 1 month / 5 years |
| Shavarath |
The Battleground |
1 year / 1 year / 36 years |
| Syrania |
The Azure Sky |
1 day / 1 day / 10 years |
| Thelanis |
The Faerie Court |
7 years / 14 years / 225 years |
| Xoriat |
The Realm of Madness |
unknown / unknown / millenia |
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