In the beginning, he was merely a formless, nameless primordial being of fire, born from molten rock, playing its part in chaotic cycle of pre history. Emerges and takes on a likeness to different creatures in order to walk amongst them.

Control of fire by early humans is what initially draws Eiriogh's attention and ire towards humanity in the form of volcanoes, wild fires and a terrible fire spitting beast. Humans come to fear and respect this entity, attempting to appease it with offerings/sacrifices in exchange for their safetey. Humans came to call these entities Fomorians, "the great underworld ones."

People would call upon the Lord of the Bonfire to protect them from the dangers of the night. It was said that the Lord had flown into the heavens to capture the fire of the sun so that it may be a light in the dark, believed the Lord carried the sunfire in its belly. The Lord was a fae-like entity, that could be helpful when appeased with offerings, but otherwise had to be outwitted or tricked. Whether bound into servitude or willingly chosing to protect, The Lord of the Bonfire turned into something of a guardian spirit and not the feared Fomorian he once was.

Aodhán (and others) would fight against the Fomorians who sought to destroy humanity by ravaging the planet. He would be remembered a traitor to his own kind, but a beloved folk hero to those he protected. His wisedom and prowess in battle in adition to power over fire meant he was percieved as a fierce leader amongst the people.

Aeghan is crowed high king, Riogh Aeghan, in the new era of peace ushered in by the defeat of the Fomorians. He is one of three high rulers who would rule the known world in tandem: himself a Fomor, one of the Aos Shide and a representative of humanity. A golden age follows, the center of civilization built in part by the sunfire Aeghan poseses.

After a time, Aodhán begins to sympathize with the suffering of his fomorian kin at the hands of humans, who have in turn sought to control the Formorian's power for their own means. Guilt at his own part in tipping the odds against Fomorians drives him to work against these policies of the other high rulers.

Aodhán's loyalties are called into question, he is accused of favoring his monstrous kin over others, loosing public favor (what is a god king if they are not beloved by the people?). Aeghan becomes increasingly withdrawn, believes the other high rulers seek to control him and his power as well. Turns into a cruel and cunning tyrant, something monstrous.

As things come to a head with the other two high rulers, Aodhán in his mania slays them and takes the capital city by force. He names himself Ei Riogh, the forever ruler. After a long bloody siege, Ei Riogh is eventually laid low by powerful magicians who extract the sunfire from his belly, thus reducing him to a weakend state.

Killing a fomorian is impossible without destroying their element in totality, so instead they magically shackle and imprison Eiriogh in the space between worlds, giving them control over his element and preventing Eiriogh from regenerating and to enact revenge.

Centuries of isolation drives Eiriogh mad, forgetting himself and those he once protected. While still connected to the element of fire on the material plane he is unable to sway or control it. The only name he remembers is Eiriogh the "ever king," the title bequeethed to him as an insult.

Eric takes on Eiriogh's power which turns him into something neither human nor fomor. This effectively breaks Eiriogh out of his prison, however his essences is now attached to Eric.