Dreamless Night

Legend has it that before Luna was banished to the moon, she had sired a few children with some lovers. Those children would later be regarded as royalty to her followers. One of them was a demon unicorn mix. It's still a mystery to who fathered the princess, but the fact that it was a demon of some sort was evident by the features this royal possessed. They say this princess was the kindest among her (half) siblings, though she is one that is quick to tears when things grow difficult. Unlike her siblings, who had amazing magical abilities connected to their mother's kingdom. Her only power were to sooth those troubled by nightmares into restful slumber, and she also had a knack for reading constellations. Seemingly useless at first, her discoveries and readings would be what furthered extra terrestrial research to where Equestria is now.