Tine

Elemental Plane of Fire

It is a plane continually ablaze.
It smells of burning flesh and ashen dreams.
It is flame incarnate.

- Manual of the Planes

Planar Movement

Tine has a planar period of 192 days and a terminal period of 9 days, 14 hours, and 24 minutes. Tine primarily affects Nemas through the ebb and flow of heat, causing temperature fluctuations similar to Earth. Tine's coterminous time is similar to a very hot summer, conversely its aterminous time is similar to an extreme winter.
During its coterminous period, Nemas experiences temperatures ranging from 90°F to 120°F during the day and 70°F to 90°F during the night depending on location. As per every elemental plane, elevated power of related magics and an increase in associated elemental creature sightings occur during the coterminous period. The increased power of magics does not manifest in everyday spellcasting. It does, however, increase the amount of fire energy in the plane and allows for rituals to channel more than the usual amount. For example, the Lasair Family uses the coterminous time to ritually and remotely renew all the continual flame spells in the city.
During Tine's aterminous period, Nemas experiences temperatures ranging from 0°F to 40°F during the day and -30°F to 0°F during the night depending on location. Opposite of the coterminous state, the aterminous state sees a decrease in related elemental magics and associated creatures of Tine are infrequently seen.

Geography

Arriving on the Plane of Fire was like stepping into the flaming maw of an ancient red dragon; if one didn't have protection or immunity from temperatures high enough to melt stone then death was swift. The following discussion assumes a visitor and all their clothing and gear had this capability and either did not need to breathe or could compensate for a superheated, often toxic atmosphere that could immolate one from the inside (think cloudkill plus incendiary cloud). In general, the more fluid the elemental fire, the hotter it was and the more damage it did to unprotected material.
Unlike the other three elemental planes, the Plane of Fire had normal gravity and a landscape, although most of the "ground" was made primarily of loosely packed elemental fire and felt like walking in a swamp of hot coals. The rivers and oceans were filled with a more liquid version of the same stuff and swimming worked normally as a mode of transportation. Non-native flying creatures found the atmosphere thin and therefore did not have their usual speed or maneuverability. Visibility was hampered by the smoke coming off the flames engulfing, but not consuming, nearly every solid, liquid, or gas (and creature) on the plane. What one could see was usually distorted by heat ripples. Geographic features such as hills, mountains, and cliffs did not have a geologic lifespan because even the more solid areas slowly moved like a subterranean magma flow as seen on the Prime Material Plane. Permanent physical structures were very rare.
If the Plane of Fire had weather, it was of course hot and deadly. Rains of hot ash moved about like thunderstorms, threatening those on or near the ground with hot embers and blinding ash. Those in the air had to watch out for clouds of superheated steam blowing around and condensing scalding water on exposed surfaces. The water quickly evaporated and the cycle began anew. Easier to avoid but just as deadly were the rivers of magma and "firefalls". Matter from other planes either evaporated, burned to ash, or melted into magma. Magma mixed with elemental fire formed a rapidly moving, incredibly hot slurry that coursed around the terrain and occasionally cascaded over a cliff edge to create a firefall, often manifesting an elemental vortex in the spectacular display. Cold spots could even be found where it felt like the middle of the @LARGE DESERT at midday.
The dangers of the plane could not be overstated, but those that survived the trip saw wonders and beauty at nearly every turn. Flame colors spanned the rainbow, from the vermilion of a forge hearth to the yellow-white of heated iron, from the blues and greens of alchemical reactions to the familiar candle-flame yellows and oranges. The conflagration formed fountains, jets, sheets, rivers, waves, walls, rains, cascades, clouds, swirls, and pits of brilliant incandescence on a scale found nowhere else.

Fauna & Flora

Surprisingly many creatures and races could tolerate and even thrive in the Elemental Plane of Fire. First and foremost were the fire elementals, of course, being constructed directly from the substance of the plane itself. They could assume the form of animals or monsters from the Prime Material Plane, mimic humanoid shape, or create composites with elemental shapes: a lava lion with a flaming mane and charcoal eyes, or a man-shaped torso with fire jets for arms and legs and a tiny tornado of flame for a head, for example. Fire elementals could usually be distinguished by the different colors of flame coming off their bodies, but when standing still they could blend into the background just as a rogue could hide in shadows. Fire bats, fire snakes, and salamanders were also thought to be natives of this plane, but the origins of magmen (or magmin) and the azer were hotly debated.
Visitors and immigrants to the Plane of Fire included brass, gold, and red dragons; the efreet; fire giants; hell hounds; and mephits of the fire, magma, and steam varieties.
The language spoken by the natives was called Ignan and it resembled the hisses and clicks of green wood being consumed by a burning campfire. Ignan is a derivation of Primordial and those who speak Primordial can understand Ignan but find it difficult to speak it.

References

Elemental Plane of Fire | forgottenrealms.wikia : A majority of content relating to Flora and Fauna and Geography was gathered from this location.

Type

Dimensional plane