Since we got two new dragon lords I decided to add them to the list I made >>1633094.  
They wil take the place of Adamor (I didn’t really like what I made with his story and was thinking about removing him anyway)
 
Gaius the fool: He succeded to dragonlord Celestina after he defeated an hydra, he was the fifth dragonlord. Gaius was extremely generous for a dragon and shared everything he had with others, his home, his food, and even his precious hoard but he was also very naive and never imagined that someone could take advantage of him.  
His demise came when he saved a yound homeless dragoness and brough her home and when he wasn’t expecting it, she took the bloodstone scepter from him, becoming the new dragonlord. Gaius was so broken by this betrayal that he did not try to fight to get his scepter back and went to live alone in shame for the rest of his life.  
His story his still told to young dragons to warn them about what happen if you are too nice to others and do not think about yourself.
 
Scales the devious: She was a mostly hated dragonlord, not because she took the power from the hands of the previous dragonlord but rather because how she did it ; instead of proving her strength by fighting Gaius, she waited for him to be vulnerable and backstabed him. The way she came into power was also the way she ruled, she never did anything by herself, often using others to do her dirty work and did not hesitate to sacrifice someone if it could advantage her.  
Her rule was short lived and ended fifty years latter, the day she had to go to the dragonlords mausoleum as part of a ceremony to pay hommage to her predecessors ; she never came out of it and those who went to seek her only found the bloodstone scepter lying on the ground with no trace of Scales.
 
To determine who would inherit the scepter after Scales, the dragons held a great competition to choose who was the strongest, this was the first gauntlet of fire.