After the elves came from overseas the Riders were created because treaties between the elves and dragons would prove useless to stop fighting: a signed piece of paper meant nothing to a dragon. So, an irrevocable bond was wrought by the elves and the dragons; the elves provided the structure of the spell and the dragons provided the strength, thus creating the Dragon Riders. When a fleet of humans sailed across the sea thousands of years later, they too were added to the elite order of the Dragon Riders.
The role of the Riders became more than uniting the Elves and Dragons: they became keepers of the peace throughout the land of Alagaësia, and were respected and honored by the people they served. There were both male and female Riders, all of whom were able to use magic. The Riders not only were peacekeepers, they were healers, scholars and the strongest magicians throughout the land (though they didn't promote that they were strong magicians).
Because of how useful Eragon I and Bid'Daum proved to be, the dragons began giving the elves two or three eggs a year, and the baby dragons chose to hatch for the elf (or, later, human) most suited to that dragon. The Dragon Riders' duty, in the beginning, was to keep the peace between the Elves and Dragons. Their duty soon expanded from keeping peace between just those two races to all the races and governments in Alagaësia. The Dragon Riders themselves were above the laws of the lands. They kept the peace between all races and in between races, though their methods were sometimes termed as "meddling" by the dwarves. The Dragon Riders were not just the soldier-diplomats between races, they were also the foremost of scholars.
After the agreements of creating the Dragon Riders, a spell was cast over the dragon eggs to ensure that the baby dragons inside would only hatch when the eggs were touched by the human or elf whom they wanted to bond with. In exceptional circumstances, the dragon would subvert certains spells and bond with a human child under the age of ten or an elven child under the age of twenty-five but most Riders were older.
The instant the egg is laid, the dragon infant inside is ready to hatch, but waited sometimes for years to. Upon hatching, the young dragon would make contact with its Rider for the first time, leaving a mark, the gedwëy ignasia ("shining palm"), on the Dragon Rider's hand. A bond forms between the dragon and the Rider, which melds their minds on a basic level, binding them for life in the most enduring friendship that can possibly exist and endowing the Dragon Rider with magic.
Vrael was their leader . He had 2 grandchildren. Akito and Maya. Both of who were Riders. The Stjarna's each had a section of hair that looked like water flowing and when touched, felt like liquid silver.
Even though Vrael was an elf his grandchildren were both mostly human (dew to their parents). The only thing that they inherited from their grandfather was his superhuman abilities and magical skills.
And this is the story of a new era for Alagaësia