First Light [An inspired fairy tale]

Prologue

This is my second story which I wrote based on Lindsey Stirling's works. I'm pretty sure there will be mistakes scattering everywhere, so please forgive me. English is not my first language, so if you spot any error, feel free to leave a comment, I'll definitely gonna fix it.
Anyway, enjoy your reading time!

Exactly two hundred years ago, the Sun shone everywhere of The Seven Realms. No realm was left in darkness. Day and night, the Sun and the Moon respectively brought light to the world. Until one day, when the former King of the Third Realm thought that he can outsmart gods, he traveled to the sky and abducted two of the Constellation sisters - Aquarius and Gemini.

Filled with wrath, the Sun and the Moon retreated their light, only shine again for the Third Realm if the king return their siblings. Yet the foolish king was full of pride, he decided to lock the two sisters in a hidden place that no one, even gods could find. To further ensure that nobody could enter this place, the king asked a powerful wizard to cast a magic seal that could only be opened if one answer its riddle.

Though the king was satisfied with his mischief, the entire kingdom was not. Without light, the Third Realm agriculture could not bring any profit nor food for the people. Everyone had to rely on candles, lamps and torches, yet not everyone had the money to buy those.

Because of one's reckless action, the whole kingdom then immersed in complete darkness. When the former King was alive, nobody could make him apologize to the Sun and release Aquarius and Gemini. However, the moment he took his last breath, his son, the eldest Prince and the next rightful King, found out where his deceased father locked the two sisters and the answer to the seal's riddle, yet he was too late. Both of the women had turned into lifeless rocks, shining no more.

Seeing his siblings not in their prior form, the Moon, on behalf of the Sun, refused to shed a light to Third Realm, even though the new King held no hostility and willing to return the two "sisters". The Moon demanded to return Aquarius and Gemini in the physical status like when they were kidnapped, or she and her husband would never shine for the Third Realm.

The task was not simple, but then was there any task given by gods appear to be simple? Witchcrafts, spells, sacrifices... the new King tried them all. And so did his sons, and his grandchildren, and his grandchildren's children...

Turning the two sister of Constellation was the hardest mission of every Royals generation. To no avail, no one has succeeded, yet.

Two hundreds years later, enough time for human to evolve their intelligence. Enough time for a certain Prince of the Third Realm to accidentally meet his solution.