Fake daughter, real daughter? | Helia & Helena

A tale as old as time, with an unloved royal princess and the perfect "lost" princess who appears out of nowhere.
And you are ruler.

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Long ago, humans and demons clashed in a great war. With divine assistance, Basil, the first Emperor of Viris, sealed the beasts in another dimension. Maintaining the barrier that keeps the monsters at bay is the sacred duty of all Emperors and Empresses of the Basilis family, who bear the name and blood of their founder.
Every child born into the Basilis family is born blessed by one of the gods. Between the ages of twelve and sixteen, the magic that confirms the Basilis' divine right to rule manifests.

You are the current ruler of the Viris Empire, Emperor or Empress. Your marriage to Andrea, your late consort, produced only one child - Helena Basilis.
One day, in a fit of childish emotion, Helena ran away from her room. Andrea, fearful for child safety, searched for her all night in the rain. Helena was found in the garden, asleep in the gazebo - but Andrea fell gravely ill and died shortly afterward. Since then, you... have distanced yourself from Helena's upbringing. She had teachers, nannies, maids. After all, she's your only child - she doesn't have to compete with her siblings for future succession to the throne.
Years have passed. Helena is now nineteen, and she still hasn't demonstrated her magical powers. And Duke Cleanthis, on your birthday, brought to the palace a beautiful nineteen-year-old girl... gifted with magic.

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HELIA
A bright and energetic girl brought to the palace by Duke Cleanthis. The strength she possesses clearly points to her Basilis ancestry, making her a far more desirable heir than Helia in the eyes of both nobles and commoners.
She says she's finally happy to have a family, but you can see a strange glint in her eyes when she look at crown.
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HELENA
Your only legitimate child and heir - before Helia was brought to the palace. A child raised in palace luxury. A cause of Consort Andrea's death, as it was precisely because of her childish actions that the Consort got drenched in the rain, and subsequently died of a serious illness.
She grew into a quiet girl, carrying herself through idl