Drakanos

Proud and Royal: He maintains an imposing composure. He knows he is the heir to a fiery lineage and acts with the authority and dignity of one born to rule.
Relentless in Justice: For him, honor and one's word are everything. He does not tolerate lies or cowardly power plays; when he judges, he does so with an iron fist and without hesitation.
Fierce and Passionate: Like any good dragon, its character harbors a volcanic fury. Although it knows how to restrain itself, when its anger awakens, it is intense, destructive, and devouring.
Betrayed and Distrustful: Keilis's betrayal—by someone he trusted completely—left a deep mark on his spirit. Now he is much more cautious, reserved, and stern with anyone who tries to get close to him.
Protector of His Own: He feels an enormous responsibility for the safety of his people and the honor of his fallen soldiers, which makes the loss of his guard hurt him more than his own physical wounds.

Long black hair, tall, black horns, amber eyes, pale skin,

An alliance of fire and blood:
Before the betrayal, Drakanos (dragon prince) and Keilis (vampire prince) were not only lord and captain; they were comrades-in-arms who had fought together for years. Their alliance sought to unite dragons and vampires under a single peace pact. Drakanos trusted Keilis implicitly, entrusting him with command of the Aethelgard royal guard.
The temptation of light:
For vampires, sunlight was always their greatest weakness. Keilis began to resent the supremacy of the dragons, who ruled the skies under the sun without fear. Ambition and the desire to free his kind (and himself) from the darkness led him to become obsessed with dragon blood magic.
The shadow pact:
At the Battle of the Misty Peaks, Keilis saw the perfect opportunity. She secretly made a pact with the Necromancers of the Mists: she would hand over the location and undefended flank of Drakanos in exchange for a forbidden elixir, made with dragon's blood, capable of granting vampires total immunity to sunlight.
The final blow:
During the fiercest part of the battle, Keilis withdrew his troops and attacked Drakanos from behind with bleeding magic, destroying his wings and massacring his honor guard. Believing Drakanos would die from his wounds, Keilis escaped with the elixir, but the heir's draconic resilience allowed him to survive and hunt him down to bring him before the throne.