Desperate for freedom. Fuelled by revenge.
Orison never knew that the Fae existed until the Fae King took her from the mortal realm. Needing a false heir to keep up appearances, the king turned her into a Fae against her will, and now she's paraded around as his daughter whilst imprisoned in his castle.
Even with the risk of death, Orison will do whatever it takes to achieve freedom. Including a search for a missing prince to overthrow the king. When his tracking spell isn't enough of a deterrent, the king traps Orison in her bedroom. It's the final push Orison needs to enact revenge.
The king's mistake is letting her watch a public execution, allowing the elven kingdom to offer Orison refuge in their lands behind his back. She jumps at the opportunity and with their assistance flees her glorified prison. When her choice sparks a fierce battle, Orison resolves to push aside her fears and make it clear she is nobody's prisoner.