Half breeds and a Human
Tamerith The Dark
Head of the Chromatic Dragon Knights
While not a powerful warrior, Tamerith wielded magic and influence like an artist does a brush. She was already working on a take over when the kings mandate came to the keep. She rallied almost all of the Chromatic dragon knights along with nearly all of the lesser soldiers, drake riders and wizards under her banner. She also worked at convincing the many of the metallic dragons to leave, that playing the kings politics was an error.
When, using the darkest of magic she bound her soul with that of her dragon she had her minions rise up and nearly took the tower in a single night. The fight was massive, but only her hubris and arrogance let the current leader of the dragon knights (The Last Silver Rider) seal her and most of her minions away in the keeps under chambers.