The Dark Princess

What if Galbatorix isn't as invincible as he sounds? The Dark King holds a secret none know, his one weakness. He has a daughter, Kyana. Kyana has known nothing but life in the dark palace, under the rule of her father. When she learns of her father's true actions, will she continue to support the Oath-Breaker? Or will she fall with the man that has stolen her heart? Murtagh/O.C.