From the setting document I’m working on for Albion Adventures.
Oh woe is the folly of mortal man!
The last king of Erun, Opus the Pious, was deceived by the purple robed priests of the Hidden Gods. They claimed their religion was for the good of all and that their Gods where only hidden since they needed to hide themselves from the attention of the jealous and impotent Old Gods. So it seemed for all and hundreds flocked to their temples to unknown gods, and thrived under their worship. The poor raised their lives up from the gutter, there was food for all! The Hidden Gods blessed all with good fortune.
So the King called a national day of celebration, upon which the purple priests said their Gods identity would finally be revealed. Thousands descended on the capital and in front of the Great Temple of Mysteries shouted out their adoration. Shouts of joy that turned to screams of anguish as the now red robed priests revealed their Hidden Gods before the assembled crowd. For there in terrible splendour stood the the Underlords of the Demon Dark. Great was the carnage that ensued that day as the assembled crowd became a mass sacrifice to the forces of Evil. The sky wept and great gates opened to hell its self in the dark deep places of Erun, forgotten underground ruins of the Ancients who predated the Kingdoms of Man and had mysteriously disappeared before their rise.
The hordes of Hell streamed out of the dungeons and the surviving armies of man fought alongside the battalions of Dwarfs and the living forests of Elven kind. The war was grim and terrible, with almost catastrophic losses on both sides. Finally the Overlords where driven back to the Deepest Dungeons and sealed in by the Grey Elf wizards.
In the aftermath of the Hell War, the Kingdom of Erun was in ruin, reduced to a handful of petty dukedoms, the countryside filled with bandits and monsters. Many of the old halls of the Dwarfs lie empty or have been taken over by foul orcs and goblins. The once great elf wood is a shadow of itself and the last few Elves either focus on its regeneration in hidden glades of power or bloody vengeance against those they perceive have done them wrong.
In these anarchic times a new class has arisen in Erun society. That of the Adventurer, more than willing to take up sword and spell and discover treasure and horror in the dark places of the world.