Material Plane

The Material Plane, or sometimes Prime Material Plane, is the plane of existence in which the world of Exandria exists.

Exandria

 * &rarr; Main article: Exandria.

Exandria is the world on which most events of Critical Role take place.

Satellites
Exandria has two moons:
 * Catha: close to Exandria and appears large in the sky. It has a 33-day cycle during which it waxes and wanes.
 * Ruidus: the reddish-purple, maroon-brown color moon. It takes approximately 1 full year to complete a rotation and thus is only visible in the sky for half the year.

Relationship to Other Planes
In some places, the barriers between the Material Plane and other planes become thin or are simply punched through. Some rifts are stable for long periods: there are settlements around long-lasting rifts with the Elemental Planes, and known portals to the Feywild, for example. The barriers regularly become thinner during the annual solstices: Winter's Crest and the Zenith. The barriers become especially thin under a Celestial Solstice.

Once opened, rifts can be widened or they can be sealed. Long-term doorways can be established between planes and realms, starting with anchor glyphs and building a permanent enchantment around them, similar to building a permanent teleportation circle.

Other Prime Material Planes
Artagan says, "This is but one of many Prime Materials", and suggests that he and Jester could travel easily between them.

Feywild

 * &rarr; Main article: Feywild.

The Feywild, or Plane of Faerie, overlaps the Material Plane. There are many points of crossing, but Vox Machina only knows of one in the Frostweald. The elven city of Syngorn has threshold crests placed around the perimeter of the city that are anchored to the Feywild, allowing the whole city to teleport to the Fey plane in times of danger.

Shadowfell

 * &rarr; Main article: Shadowfell.

The Shadowfell, like the Feywild, overlaps the Material Plane. The only known portals are the three magic siphons that were set up throughout Exandria. The city of Thar Amphala, using threshold crests like those of Syngorn, was able to teleport to the Material Plane.

Astral Plane

 * &rarr; Main article: Astral Plane.

The Astral Plane, or Astral Sea, contains gateways to other planes and is home to the githyanki.
 * According to Lady Allura, when a Bag of Holding is destroyed, its contents are jettisoned into the Astral Sea.
 * When Scanlan Shorthalt scried through his magical poo, his consciousness transcended the Material Plane, traveled across the Astral Sea, and arrived at his scrying destination on the Material Plane.

Ethereal Plane

 * &rarr; Main article: Ethereal Plane.

The Ethereal Plane overlaps the Material Plane, but they are somewhat out of phase with each other.

The Elemental Planes
The Elemental Planes intersect with the Material Plane. The druidic Ashari guard most of the portals at the connecting points.
 * Elemental Plane of Fire in Pyrah - Thordak was sealed there, but broke back into the Material Plane on Winter's Crest with the help of Raishan.
 * Elemental Plane of Water in Vesrah and on Rumblecusp
 * Elemental Plane of Air in Zephrah
 * Elemental Plane of Earth in Terrah
 * Frostfell in the Frostweald. Errevon the Rimelord opened a larger rift on a Celestial Solstice; years later, after Errevon's forces were pushed back through the rift, the Ashari sealed it.

The Far Realm

 * &rarr; Main article: Far Realm.

The Far Realm is another dimension that connects to the Material Plane in some places, often in the depths of the Underdark.
 * Clarota told Vox Machina that, should they try to enter through the rift to the Far Realm that they found while in the Underdark, their minds would break.

The Divine Gate and the Outer Planes
At the end of the Calamity, the Prime Deities erected the Divine Gate, a sort of lattice through which gods cannot pass, between the Outer Planes (where the divine exist) and the rest of creation: the Prime Material, Ethereal, Astral, and various Elemental planes, as well as the Feywild and Shadowfell. Most people call this event the Divergence, though some more religious folk call it "The Penance" while students of the arcane call it "The Second Spark." The Divine Gate has been narrated as a visible phenomenon while shifting between the mortal planes and the divine Outer Planes: the Nine Hells, Elysium, Ioun's secret realm,, and Pandemonium. (It does not appear when traveling, say, from the Material Plane to the Feywild. It also does not stop a god from traveling between the Outer Planes.) A unanimous effort of the Prime Deities or possibly an unsealed Tharizdun could break the Divine Gate, which would lead to another Armageddon on the mortal realm.

The Abyss

 * &rarr; Main article: Abyss.

The Abyss is the home of demons like Yenk the goristro and demon lords like Yeenoghu.
 * In D&D: Dungeon Master's Guide, the Abyss is one of the Outer Planes. It "has a seemingly endless number of layers" and is associated with the chaotic evil alignment. That cosmology may not be exactly canonical for Critical Role, but the Endless Maze from which Yenk hails corresponds to a canon layer of the Abyss, as does Orcus's realm of Thanatos.
 * Arcane devices called "Abyssal anchors" can slowly tear holes through the barriers between the Abyss and the Prime Material Plane; they were used during the Calamity to allow demon generals to invade various places in Exandria, and the Angel of Irons Cult used crude versions to cause demonic incursions in the Kryn Dynasty.