The Ashen Crow's Revenge

Seraphina, Phoenix princess, is betrayed by her Lesser Sister and husband. She dies. Deity Caelus helps her be reborn. She plots revenge, bearing a Divine Lineage. She uncovers her ex-husband faked his bloodline. At a ceremony, her Lesser Sister gives birth to a monstrous creature, while Seraphina gives birth to a divine phoenix. Awakening as the Crimson Sun-Phoenix, she exposes the conspiracy, saves her people, and builds an era of equality with the deity.