Fernia, the Sea of Fire

Fernia, the Sea of Fire is a continually burning landscape. Plates of compressed ash and debris float atop oceans of liquid flame as mountains ooze with molten lava.

Description
The plane of Fernia is comprised almost entirely of liquid flame. Fire constantly rages, without the need for air, and what little air exists ripples with the heat of continual firestorms. A large landmass of made entirely of ash is said to float upon magma at the center of Fernia. Upon it is the mythical City of Brass, which the efreeti call home.

Inhabitants

 * Fernia is the origin plane of all fire elementals and paraelementals.
 * A large amount of extraplanar outsiders call Fernia home, including azers, cinder swarms, conflagration ooze], ember guards, magmins, rasts, salamanders, and zezirs.
 * The genie-like efreeti are said to live on Fernia in their City of Brass.

Manifest Zones

 * There are rumours that House Cannith sought out manifest zones to Fernia and Shavarath when they built the Creation Forges to create Warforged, but it has not been recorded which forges were built on which zones.
 * The Fang Crater in the southern end of the Blade Desert in the Talenta Plains was the site of a great planar incursion from Fernia. Now a field of glass and shattered rock, it remains a potent manifest zone.
 * High in the ice-covered tops of the Byeshk Mountains in Droaam sits the Fantaran Hot Springs, which were discovered by the exploreres from the Wayfinder Foundation. The hot springs - possibly Droaam's only tourist attraction - sit on a manifest zone with Fernia.
 * Dwarven legends claim that the Fist of Onatar, an massive active volcano deep within the Mror Holds, is a manifest zone with Fernia.
 * Fernia manifest zones in Xen'drik are thought to result in the growth of Fernian Firepeppers, a spicy pepper coveted by chefs across Khorvaire.

Coterminous
When coterminous, Fernia generates intense heat on Eberron, especially surrounding volcanoes. Air temperatures can reach as high as 140 F, causing pain when breathed in. Existing lava or magma pools become hotter, dealing more damage. At areas of incredibly high heat (like volcanoes or lava pools), inhabitants of Fernia can cross over into Eberron. In these areas, fire spells become more powerful.

Fernia is most likely to become coterminous during the midsummer month of Lharvion every five years or so.

Remote
When remote, areas of great heat on Eberron (volcanoes, lava pools) become less intense. Outside of those areas, casting fire spells become more difficult, fires burn more coldly, and the air takes on a distinct chill.

Fernia tends to become remote during the midwinter month of Zarantyr) roughly every five years.