Even as a child, Vaylin showed signs of tremendous power. Fearing she would one day challenge him, Valkorion imprisoned his daughter while he sought limits and controls on her power.
Through brutal experiments and mental conditioning, Vaylin was subconsciously trained to respond to a specific phrase: kneel before the Dragon of Zakuul. When spoken by her father, these words prevent Vaylin from unleashing her power and temporarily trap her will in an unbreakable mental prison.
While effective, it is likely the conditioning aggravated Vaylin's violent tendencies and contributed to her mental instability. While trying to cage his daughter's anger, Valkorion transformed her into a monster.