Ephereos

Ephereos, who bears the titles  Primordial Dragon  and  Firelord,  is the evil and spiteful god of fire and anger. Uniquely, he had a period in which he manifested on Equis, causing a great deal of chaos and devastation.

Worshipers
Many tieflings worship Ephereos as the creator of their race, though this is not a complete picture of that race's generation. Numerous fire-wielders also revere Ephereos for his influence on their craft.

Ephereos' Immortal was the treacherous tiefling Hamann. Hamann died to allow Ephereos to incarnate onto the mortal plane, and now, several hundred years later, Hamann has been replaced by the tiefling dragon mage Kyton.

The Blackened Tribes
The nomadic tribes on the Fields of Ash in Equis revere Ephereos as Shul'bak, meaning "the razing king." They worship and fear him for what he did to their people centuries ago when he incarnated on the mortal plane and set fire to the entire region. All newborns in the tribe are ritually burned in Ephereos' honour.

Tormism
Tormism is the faith practiced in Torm. Notable tenets of the faith include an emphasis on dominance over others (giving rise to slavery in Torm) and on the distinction between divine and arcane magic, the latter of which is seen as a heresy but the former of which is considered a great blessing.

History
Ephereos was one of the second generation of Aål-spawned gods, along with the other gods governing the prime elements. His Immortal, Hamann, was one of the first of his kind. Hamann's greed and jealousy, as well as his rampant use of Ephereos' power, made him an easy candidate for the god's possession, and throughout Hamann's life Ephereos' influence would only grow stronger.

Eventually, Hamann's life would be sacrificed to incarnate Ephereos in the material plane in the form of a colossal red dragon on Equis. His manifestation burned the land for miles around him, and the god went on a rampage, seizing the Bridge to pull the Infernis closer to Noctis and attempt to merge the two planes. But the Plexus, the cosmic weave, was torn during the Reign of Fire era, and it culminated with the death of Skool, the repairing of the Plexus, and the banishment of Ephereos back to his own plane.