There is a legend on the planet of Amitix, the keeper of balance and harmony within the magical dimension. The legend states that every 500 years twins shall be born into one of the noble families of the kingdom and that these twins would be the very embodiment of balance in the universe. One is to be born as the Fairy of Light and the other as the Dark Witch; this achieves a key part of the balance. With this the balance of light-and-darkness, good-and-evil is held and protected within the magical dimension.
Because of the sacredness of this balance these twins are seen as holders of great power; they are not only the symbols of balance but the very protectors of it. Because Amitix is the planet of balance and harmony it was declared long ago that the twins of harmony would grow up to be the guardians of Amitix.
One would probably expect that bestowing so much responsibility on someone, especially at birth, would cause problems, even chaos considering the magic being dealt with. But there never was, when it came to the twins accepting said responsibility there were never any objections to deal with, and it had been prophesied that there never will be. It may just be due to the teaching of Amitix or because of the respect and honor that go along with the power or maybe something even mystical, whatever it is, it has always made things much easier.
About sixteen years ago the 500 years passed since the last twin guardians of Amitix and a new pair was born into the noble family of Roiyaru, but there was a problem. One of the twins was born too weak and sickly thus it was immediately realized that she would be unable to wield any kind of magic, most defiantly not one that is needed to hold together the universe.
It was a tremendous problem but nothing changed, the twin's destiny was still intertwined with the balance of the universe. The instability though caused the elders of Amitix to gather and 'interfere' with the prophecy. The legend for this pair was changed so that one, the healthy girl, would be the holder of both light and dark, thus making her both the Fairy of Light and the Dark Witch.
It was going to be hard without a doubt but it was necessary and at the time it was the only option that guaranteed no risk of imbalance and chaos. It was possible, maybe lonely but it was possible and that had to be good enough.
A/N: So this my first fan fiction, hope you like it and feedback greatly appreciated.