Plot Idea: "Son of the Moon"

Plot freely inspired to the song "Hijo de la Luna", by Mecano. And with some sprinkles from "The Mandalorian".

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Once upon a time, a young woman fell in love with the Wandering King, the infamous general of a mercenary army travelling through the kingdom and selling their services to the highest bidder.
Knowing she would never be able to catch his attention, she prayed to the Moon Goddess her town worshipped for a chance to make him fall in love with her.
The Moon Goddess replied to her: she would have her man, but only if she promised she would consacrate her firstborn to her.
The maiden agreed to the oath and so the Goddess used her powers to make love bloom between the King and the young woman: the two eloped and then left the town with the entire army.

Time passed and the young wife gave birth to an healthy baby boy. Though, there was something strange about him: the boy had hair and skin as white as the moon and silvery grey eyes.
Seeing how the child inherited nothing of his cinnamon skin or the mother's darker complexion, the Wandering King immediately thought the kid not to be his.
The shock of the perceived betrayal broke the love spell the Moon placed on him and the King stabbed his wife to death with no second thought.
His rage still not abated, he moved to grab the kid with the intention of abandoning him, when his wizard counselor, who helped the mother give birth, stopped him: he felt an incredible magic coming from the baby and wanted to study him.

Through divination, he found out the truth: the baby's mother sworn him to the Moon Goddess and that granted the kid a powerful latent magical power.
The Wandering King decided then to keep the baby and raise him to be his future weapon, so that one day his army could conquer the kingdom it once worked for.

Knowing of the cruel destiny waiting for the baby, the wizard and his apprentice, a faun named Silayl (my OC), decided to escape and bring him to the Temple of the Moon Goddess, hidden away between the mountains. There, he would be safe, taught by the Temple's clerics and warded by the Moon's direct protection.
Sadly, the wizard sacrificed himself to allow his apprentice and the baby to run away after the "kidnapping" got found out.

Now, Silayl is on the run from the Wandering King and tasked with protecting the baby and find the Temple of the Moon Goddess, but it may be too hard of a journey to make on his own.
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A few notes:
- fantasy races are allowed (Silayl is a faun, after all);
- the main plot is to bring the Moon Baby to the Temple, further details and subplots can be freely added after discussing them;
- I like romances, but only when they develop naturally, so, please, don't try to push for it