The Imperial Heir Swap

Consort Willow secretly swaps the infants. Seraphina raises Willow's son, Alaric, helping him secure the title of Crown Prince. At the investiture ceremony, Willow reveals the swap. Seraphina reveals: the abused prince is the illegitimate child of Emperor Shaw; Emperor Shaw is not of royal blood. Seraphina dethrones the emperor and ascends the throne.