Khyber's fiendish offspring overrun the surface world, creating a hellish environment where rakshasas and night Hags rule supreme.
This timeline uses the common calendar of Khorvaire called the Galifar Calendar which was developed during the reign of King Galifar II, called "the Dark," and places it's year 1 at the year of the founding of the Kingdom of Galifar. (Year of the Kingdom or YK) so all dates prior to that year are negative numbers and all dates after are positive. (The standard timeline given in official WotC books measures the dates in positive numbers from Year 1, but measure the dates in negative numbers from Campaign Start, so Year 1 is also Year -998.)
In the mythic past, the world was one and the Progenitor Dragons, the first and greatest of dragon-kind, ruled all. The three most powerful (Siberys, Eberron, and Khyber) discovered (or created) the Draconic Prophecy. Khyber and Siberys disagreed over the Prophecy and battled with one another. Khyber was victorious over Siberys, and sought to take control of the Prophecy, only to be attacked by Eberron. Eberron wrapped her coils about Khyber, trapping the evil wyrm.
In the end, Siberys' shattered body became the Dragon Above - the glowing ring that surrounds the world. Khyber, still trapped in Eberron's coils, became the Dragon Below and the source for all great evils. Eberron healed the World Between by becoming one with it. Siberys called forth the next generation of dragons, Eberron created all manner of other living things, and Khyber spat out the fiends.
Khyber's fiendish offspring overrun the surface world, creating a hellish environment where rakshasas and night Hags rule supreme.
The Age of Demons or the First Age is a period of history spanning nine million years that is mostly known of through myths in the modern era.
Khyber's fiendish offspring overrun the surface world, creating a hellish environment where rakshasas and night Hags rule supreme.
After millions of years of oppression at the hands of the fiends, the dragons of Argonessen, through the combined efforts of the blue dragon Ourelonastrix and the couatl Hezcalipa, rediscovered the draconic Prophecy and rose from their primitive state to oppose the fiendish Overlords, allying with the other draconic species descended from Siberys, including the couatls. The common humanoid races of titans, humans, dwarves, halflings, orcs and goblins, all still in primitive states on their respective home continents, hid from the god-like combatants and found a way to survive the great conflict.
After over a million years of war between dragonkind and the fiends, the couatls sacrificed most of their race’s number in an unimaginably powerful ritual that banished the mightiest of the demon Overlords and the majority of the fiends back to Khyber, where they were trapped for eternity by the combined divine force of the couatl race, which became known much later to the people of Khorvaire as the Silver Flame. Many night hags, foreseeing the coming doom of the fiendish races, fled instead to Thelanis where they soon became a major scourge of the fey peoples. Those aboleths who could not escape back to Xoriat fled into the deepest depths of the underground seas of Khyber, there to wait the day the Silver Flame guttered out and they could seek their own revenge with the fiends against the great wyrms. The dragons retreated to Argonnessen to further contemplate the Prophecy, ignoring the “lesser races.”
The massive elemental humanoids known as the giants rose from the ruins of the Dragon–Fiend Wars to establish a vast and powerful civilization on their home continent of Xen’drik. The giants were towering humanoids who were strongly tied to the elemental nature of Eberron, a world forged in part by the Progenitor wyrms from the raw material of the Elemental Chaos. The giants were in some ways the sentient expressions of this part of the world’s nature. At least three major giant civilizations are known to have come into being during this time through the efforts of the greatest of giantkind who were called the titans: the peaceful, intellectuallyinclined Empire of Cul’sir, the Group of Eleven and the militaristic, flame-worshipping Sul’at League. The giants of these civilizations enslaved the elves, recently arrived immigrants to Eberron from the mirror world of Thelanis. The elves were a relatively peaceful, nomadic folk who enjoyed living in the woodlands and jungles of Xen’drik before the first of their tribes began to be enslaved by the giants. This enslavement had the inadvertent effect of pulling the first of the common humanoid races out of their primitive state.