In the real world, I am currently running a D&D 3.5e campaign in a custom setting. The name I have for it is "Slayer-Dragon War", but that's hardly appropriate anymore and needs to be revamped. Rough setting background is as follows:
For thousands of years, dragonkind has been the dominant species of the world. With their physical might, all but immortal lifespan, psionic abilities ((I'll get to that)), and miraculous quality of growing stronger with nothing more but age, few could challenge them for dominance. One by one, other nations were subjugated, assimilated, or destroyed. Until the dragons went to war with the elves.
The elves, at first, fought the dragons like any other race; desperately, with mundane means, and little chance for victory. Seeing the elves' plight, the ancient nature spirits of the world approached them with a proposition; wield their power in battle against the dragons, and in exchange use it to protect the forests and other natural places of the world. Thus were the first druids born. Using this newfound power, the elves were able to fight the dragons to a stalemate, and the two races have been warring on-and-off for the centuries to follow.
But the elves and the dragons are not the only players in this tale.
For as long as anyone could remember, humans were slaves to dragonkind. It was mostly a symbiotic relationship; the draconic masters were typically kind to their charges, and the humans' quality of life was vastly improved by the arrangement... when the dragons first found them, humans were living in caves and hardly even knew what fire was.
However, "typically" and "always" are not the same. A few decades ago, a young man by the name of Ecthelion came into the possession of a particularly cruel and sadistic dragon. When the opportunity was presented to him, Ecthelion fled, disappearing into the wilderness.
The human eventually came upon a cave, dug into the side of a hill in a forest. Within, he found an old hag, who was kind enough to him. He told her his story, and of the plight of the human race... for all of the kindnesses in the world could not change the fact that they were enslaved. Still, it was hopeless. The humans could not hope to fight the dragons.
The hag's face spread into a wide grin. She asked Ecthelion if he would do anything it took to give his people the power to fight back. Ecthelion agreed without a moment's hesitation. She cackled, her voice warping as she transformed into a huge, horrific demon before his eyes. "Very well. I hereby grant you the power to fight against your draconic masters. But know, Ecthelion, that there will one day be a price..."
The boy passed out. When he came to, the demon was gone, and the cave was filled with bookshelves. So Ecthelion studied for years, before finally returning to the home of his former master. With a gesture and a word, he destroyed the dragon utterly. Thus, humans gained the ability to wield the arcane.
With Ecthelion leading them, mankind rebelled. They won a few easy victories at first, before the dragons knew the very real threat they suddenly posed, and claimed a few draconic cities. They named the first, where Ecthelion first destroyed his master, Dragonfall.
Since then, the elves and humans have been at an uneasy peace, and while formally at war with the dragons, there have not been any real battles for some time.
The campaign I am running starts with the celebration of an alliance struck between the humans and the elves, and the largest draconic army ever seen commencing an invasion of the elven lands.
What I would like to do is flesh out some of the history between this point, which is a decade or two after the original rebellion, and the point where the humans won their freedom. I would also like to flesh out some details about the world as a whole, and the infrastructure of the human, elven, and draconic nations. I would like to do this by running a roleplay of some sort here on E.
The format of the roleplay depends on how much and what kind of interest I get. At this point, I'm open to suggestions. This will not necessarily be D&D, for the record.
Edit: Small note. Dragons have psionics because in this campaign world, only humans can use arcane magic. But most dragons can cast as a Sorcerer of some level. To compensate for this, I gave them psionics instead.