The number of humans that possessed dragon blood didn't even reach 30 once the revolution started but by the end of the war the number of individuals with human blood was close to thirty thousand. This was all thanks to the use of the blood of the defeated dragons and the research that they managed to find in the under covered labs.
There were some things that affected the powers that they gained after injecting the blood into themselves:
First was how strong the dragon that they used to extract the blood, dragons tend to get stronger has they age but age is not the only thing that affects the dragon strength.
Second was the attribute of the dragon, like the elves dragons had affinity for specific attributes meaning that if a dragon with fire affinity decided to use water magic the power would be lower.
Thirdly and most important was the fact that some dragons had unique attributes like the former Dragon king, he could wrap space and use all the elements without any downside.
That information allowed humans to go to war with the dragons for over 200 years, they couldn't win the war since it would require over five S class dragon soldiers or over ten A class soldiers to defeat a single adult dragon. It would require then ten times more if they decided to face an Old dragon or an Ancient Dragon such has the Nobles that witnessed the passing of the former King.
The war came to an end once the Dragons got a new king, he was a fire Dragon but his fire breath was white unlike all the other fire dragons.
He decided to end the war because the dragons had nothing to gain from this war since they only needed slaves to fuel their own greed over ores and land.
"This entire war started because some of my people decided to kill their opposition using some shameful methods to steal their mines once they passed away."
Those were the words that the new Dragon king said to the Human Emperor Lancelot, unlike most dragon soldiers Lancelot didn't want revenge for all the slavery but instead he wanted to see his people enjoy the new freedom that was given to them, and like that the war came to an end and a new race rose to the top creating an Empire between the Demon territory and the Elves forest.
This new Empire would be called Lancelot Empire after the new dragon king decided to use its dragon words to make a promise that the dragons would never again engage in war while he was alive unless someone attacked them first, this symbolised the begging of our story.