The Elemental Chaos was an Inner Plane in the Great Wheel cosmology, located at the far reaches of the elemental planes, where the elements dissolved into a single mix of colliding energies. In the World Axis cosmology, it was the fundamental plane within which were contained all of the former elemental planes and energy planes, as well as the planes of Limbo and the Abyss.
A tempestuous sea of ever-changing terrain and clashing elements, with stability only enforced in isolated locations, the Elemental Chaos was ruled over, at least in name if not fact, by the primordials and was the equal and opposite of its divine counterpart, the Astral Sea, as the primordials were the opposites of the gods as demons were to devils.
In spite of its chaotic and dangerous landscape, most parts of the Chaos were relatively easy to travel through, or at least as much as most other planes.
The Elemental Chaos had existed as long as the Astral Sea, but prior to the Spellplague was unknown to nearly all inhabitants of Toril. During the sundering of Abeir from Toril the primordials, with a few exceptions, who inhabited the Chaos lost their influence over Toril and the surrounding space and were driven from the local multiverse into a separate and parallel existence, where Abeir also dwelt. Only with the Spellplague and the subsequent swapping of material between Abeir and Toril had the Elemental Chaos again become a part of the local cosmology, reabsorbing the local elemental planes as well as the Abyss and Limbo.
According to the World Axis cosmology, though most of the Elemental Chaos was an ever-changing landscape defined by chaos and unpredictability, there were planes within the Chaos that had a more defined set of stability. These sub-planes, called realms, were formed through the will and power of mighty elemental beings, often primordials but including other denizens of the Chaos as well. Within these realms a sort of order was maintained, often reflecting the nature of its creator and ruler. This was not always entirely true and the Abyss, for instance, was as chaotic and dangerous, if not thoroughly more so, than the rest of the Chaos.
- The Abyss
- The home of demons, the Abyss was a deep, multilayered plane that lay at the "bottom" of the Chaos.
- Cresting Spires
- Dominated by the primordial Istishia, the Cresting Spires were a plane dominated by water.
- Forged by the titan Thrym, this plane was covered in ice.
- Hidden Realm
- The most powerful of the titans, Annam, ruled this mysterious realm.
- Ruled over by the titan Surtr, Muspelheim was dominated by a volcanic landscape.
- Root Hold
- Dominated by Grumbar, the primordial lord of the earth element, Root Hold was a series of vast subterranean halls with strong connections to the Dismal Caverns and Dwarfhome.
- Sky Home
- A realm ruled over by the primordial Akadi and dominated by rolling clouds and dark storms. Sky Home had links to the plane of Arvandor.
- This realm resembled a landscape of rolling hills and was dominated by the titan Grolantor.
- A plane of storms, this plane was ruled over by the titan Memnor.
- The Undying Pyre
- The Undying Pyre was a fiery plane of thick smoke and mighty flames, ruled over by the strongest of the primordial lords, Kossuth.
- Mike Mearls, Jeremy Crawford, Christopher Perkins, James Wyatt (2014). Dungeon Master's Guide 5th edition. (Wizards of the Coast), pp. 43, 52–53. ISBN 978-0786965622.
- Richard Baker, John Rogers, Robert J. Schwalb, James Wyatt (December 2008). Manual of the Planes 4th edition. (Wizards of the Coast), chap. 4. ISBN 978-0-7869-5002-7.
- Richard Baker, John Rogers, Robert J. Schwalb, James Wyatt (December 2008). Manual of the Planes 4th edition. (Wizards of the Coast), p. 16. ISBN 978-0-7869-5002-7.
- Richard Baker, John Rogers, Robert J. Schwalb, James Wyatt (December 2008). Manual of the Planes 4th edition. (Wizards of the Coast), p. 64. ISBN 978-0-7869-5002-7.
- James Wyatt (June 2008). Dungeon Master's Guide 4th edition. (Wizards of the Coast), p. 160. ISBN 978-0-7869-4880-2.
- Bruce R. Cordell, Ed Greenwood, Chris Sims (August 2008). Forgotten Realms Campaign Guide. Edited by Jennifer Clarke Wilkes, et al. (Wizards of the Coast), pp. 66–67. ISBN 978-0-7869-4924-3.
- Bruce R. Cordell (2009). City of Torment. (Wizards of the Coast), p. 69. ISBN 978-07869-5184-0.
Prime Material plane • Feywild • Shadowfell • Fugue Plane
Transitive Planes: Astral Plane • Ethereal plane
Inner Planes: Elemental Plane of Air • Elemental Plane of Water • Elemental Plane of Earth • Elemental Plane of Fire • Elemental Chaos
Para-Elemental Planes: Frostfell • Swamp of Oblivion • Fountains of Creation • Great Conflagration
Quasi-Elemental Planes: Lightning • Radiance • Minerals • Steam • Vacuum • Ash • Dust • Salt
Outer Planes: Arcadia • Mount Celestia • Bytopia • Elysium • Beastlands • Arborea • Ysgard • Limbo •
Pandemonium • Abyss (Layers) • Carceri • Hades • Gehenna • Nine Hells • Acheron • Mechanus
Energy planes: Positive Energy plane • Negative Energy plane
Planar Pathways: Infinite Staircase • Oceanus • Mount Olympus • Styx • Yggdrasil
Prime Material plane • Cynosure • Fugue Plane
Transitive Planes: Astral Plane • Ethereal plane • Plane of Shadow • Spirit World
Celestial Outer Planes: Arvandor • Brightwater • Dwarfhome • Dweomerheart • Gates of the Moon • Golden Hills • Green Fields • House of Knowledge • House of the Triad
Fiendish Outer Planes: Abyss (Layers) • Barrens of Doom and Despair • Blood Rift • Clangor • Deep Caverns • Demonweb Pits • Fated Depths • Fury's Heart • Hammergrim • Nine Hells • Nishrek • Supreme Throne
Neutral Outer Planes: Dragon Eyrie • Heliopolis • House of Nature • Jotunheim • Warrior's Rest
Inner Planes: Elemental Plane of Air • Elemental Plane of Earth • Elemental Plane of Fire • Elemental Plane of Water • Positive Energy plane • Negative Energy plane
Planar Pathways: Infinite Staircase • River of Blood • World Tree
Prime Material plane
Fundamental planes: Astral Sea • Elemental Chaos
Astral dominions: Arvandor • Banehold • Celestia • Cynosure • Deep Wilds • Demonweb Pits • Dismal Caverns • Dwarfhome • Eternal Sun • Fugue Plane • Gates of the Moon • Green Fields • House of Knowledge • Nine Hells • Nishrek • Supreme Throne • Towers of Night • Tu'narath • Warrior's Rest
Elemental realms: Abyss (Layers) • City of Brass • Cresting Spires • Fimbulwinter • Hidden Realm • Muspelheim • Root Hold • Sky Home • Steading • Thraotor • Undying Pyre • Zerthadlun
Parallel planes: Feywild • Shadowfell
Anomalous planes: Far Realm