The Elemental Plane of Fire
was one of four Elemental Planes
and two Energy Planes that cosmologists
believed were the source of the fundamental building blocks of all matter and energy in existence. Travel to the plane was usually accomplished by a temporary gate created by a spell, by an elemental vortex
occasionally found in a lava pool or active volcano, or by astral projection
. It was a uniquely beautiful place made up of flames of every color, but it was also extremely hazardous to the unprotected or unwary. Temperatures high enough to melt stone and a toxic atmosphere were just the first of many dangers a visitor had to face.
A surprising number of creatures lived and thrived on this plane. Fire elementals, salamanders, the azer, efreets, fire giants, brass and gold dragons, to name just a few. Of these, the efreet were the most open to outside contact in the form of trade. Their fabled City of Brass floated on and above the continuous conflagration in a brass bowl 40 miles (64 kilometers) across and was one of few refuges from the destructive heat.
The Elemental Plane of Fire was the home of Kossuth the Fire Tyrant, Lord of Flames. His cult had widespread reach in Faerûn with many followers, primarily centered in the land of Thay. During the Spellplague, the Elemental Plane of Fire and the other Elemental and Energy Planes collapsed into the Elemental Chaos, but Kossuth, the City of Brass, and most of the inhabitants rode out the cataclysm and adjusted to the new environment.