Together the riders and dragons were powerful and spread peace over the land. Until the dark emperor and his 13 servants destroyed the dragons and the riders. The final desicive battle took place at the riders greatest stronghold. The battle ended when an elven rider converted his body into energy through atomic fission and destroyed everyone fighting... all except the emperor and several servants...
The empire was formed and 100 years later the events of the great inheritance, the story of the rider who defeated the emperor unfold. That rider left the land for a new one to raise the new generation of dragons and protect them until they repopulated the species. In this far land across the sea the dragons thrived several generations pass and the eggs began to circulate. Through the land searching for the ones they chose to bear as a rider.
The eggs were presented to crowds of young people humans and elves in the hope one would hatch and they could become a part of the legend. The one rider never returned to the land of his birth and if an egg hatched and the dragon and rider had grown until the dragon could breathe fire they were summoned by the eldest dragons who bore riders to the place where they rested to train the new riders in their powers.
In time Magic had become highly restricted by laws the practice wasn't illegal but the limitations and punishments were severe. A fear of magic and several anti magic groups had grown out of the ashes of the fallen empire. Humans held enmity towards elves and dwarves for invading their homes during the times of the great inheritance further splintering the relationships between the races. The urgals a warlike horned race had begun to form warbands in search of honor to gain a a mate. The raids were brutal and none were left alive.
A young man touched a green egg and a glittering hatchling burst out. It squeaked in a feeble roar and he was taken to the rookery to begin his instruction in dragon care and riding. The rider and dragon were two minds and souls bound together. It was at the rookery where the young man met an elf maid who was also chosen.
(You are the elf and you pick the color of your dragon unless you want him to be the elf you are human)this is just a rough idea based on eragon)