Just a little thought that came to me when Paige said the line 'Demons fear it, good magic respects it' in the episode The Day that Magic Died. Took me a little under an hour to write. Quintessence of the First Unicorn
It all started with a maiden. She was beautiful, clean and innocent and most of all she was the essence of pure, good magic. In those times she was known to be the main source-even the first source of good magic. It was not a secret that she was an orphan. In the extreme battle between good and evil, witches and demons her parents were killed in crossfire, the battle itself only lasted a few hours but it left enough destruction to go down in history. Days past and not a second gone by that she wish that she had done something to save them, a protective spell, a potion or even a crystal cage.
So then on she decided to devote her life to promote peace. Years later she was known as the White Witch, the quintessence of good, it didn't take long for her to earn the name Kristina the White. She choose to live alone in a small cottage with a delicate pond and a large garden which she would grow many herbs and plants. She had a few pets for company, dogs, and birds, cats to warn off rats and mice and many others you can think of.
One day when she was away at the market to sell some of her goods, demons raided and killed all her beloved pets and destroyed all her lovely herbs and potions. When she returned she dropped into distraught and during that time a large explosion erupted that took out all of the demons. Afterwards when everything calmed down there was nothing left but the first unicorn.
The unicorn's horn is said to be the essence of pure magic, it was first known as the soul of Kristina the White manifest itself. The unusual happening happened because of the amount of good magic around the lonely cottage, others say it happened because she was a powerful witch and she choose to live a life of a creature of pure magic.
The end.