The Legend
Once three mythical creatures were born from the stars. One was black, he was evil through and through. Another was white and she was good from the bottom of her soul, the other was grey he was in between. As it was fated by their stars they would war until one triumped. Well during their life time nobody won. So their offspring continued the war. Still nobody won so this cycle went on and on.
In an attempt to stop the fighting the leader of the good cast a spell on the leader of the evil. The spell made the evil stallion fall in love with the leader of the good. The two opposite leaders had four children together. A white unicorn stallion, a black unicorn stallion, and a mare unipeg. But the spell was broken and the fighting resumed...
When the four foals were two, their mother was killed by their father. The good queen's real mate then killed the evil stallion and banquished the four foals to the land of peace. One day the fighting killed the peaceful leader and the four foals emerged from hiding. The two unicorns both hated each other deeply. The young white unicorn took his mothers place as the ruler of the light. The young black unicorn took his fathers place as the leader of the dark. The young mare unipeg taking after the ruler of their home, peaceful.