The Poisonous Princess

Estelle Yan was switched at birth by Conrad Shaw for Seraphina Shaw. Estelle returns for her poisoned Empress Mother. Her poison skills let her ascend the Dragon Throne, breaking the fake princess's legs. She buys convict Kaelan Hawke. They ally. Conrad collaborates with Western Regions, launching an army. Estelle and Kaelan suppress it. Estelle's father murdered by Conrad. Estelle conquers west, captures Shaw father/daughter. Estelle retires with Kaelan.