Remember kids, when a god tells you not to look back, DON'T LOOK BACK.My submission for Equestria Daily's Artist Training Ground Day 14. Today's theme is myths. I had two ideas, but one involved lots of fillies which are the bane of my existence. So instead Lyra gets to go to hell and back and lose everything.I'm stupidly happy about this one because Phoe (the awesome blogpony running the event) wrote a little story to go for it!------Once upon a time, in a magical land called Equestria, there were two ponies who were very much in love. Bon Bon spent her days baking, or picking wildflowers, sharing both each night with the mint colored unicorn called Lyra, whose lyre was said to play the most beautiful music in all of Equestria. Ponies came from all over to Ponyville to hear her songs, entranced by the love entwined within every note, every pluck of the string. But it was only one pony who heard her true masterpieces - under the moon each night at midnight, the pair would sit and look up at the stars, and Lyra would play. They say that these notes were so awesome that to hear but a chord was to touch the heartstrings of creation. And they were all for Bon Bon. Only for Bon Bon.But it could never last. One day out gathering flowers to decorate a very special plate of candies with, Bon Bon was beset upon by a jealous stallion who sought to seduce her. He chased her for hours across the countryside, matching gallop for gallop, wearing the frightened mare down. It seemed that he would have her any moment, but when he made his move she backed away, falling into a pit filled with a viper. The frightened serpent lashed out against her leg - the poison took her before he ever could. Much to everypony's surprise, when Lyra found out she had not a single tear to shed. "I will save her," she said, "For Bon Bon, I will go through Hell. I will give up everything I am."The Underworld was filled with perils, but the unicorn bard never flinched. She crossed the river Styx, stared down the three headed hound. At last she stood before Persepony, Queen of the Dead. "Give her back," said Lyra, "Return my Bon Bon to me." And Lyra pulled free her instrument and played a song, one that had been meant only for Bon Bon. The Queen was moved to tears - an event that had not happened before or since. With a nod of her head, she relented. Lyra was allowed to lead Bon Bon out to the surface, if she would trust the word of the Queen and never look behind her until they had returned home. Lyra consented. "Of course. Anything for my Bon Bon."And Lyra was true to her word... until she saw the entrance to the surface. Her heart ached with longing. Her head turned of its own accord. She just had to see! "...Lyra?" Bon Bon's face was a mixture of sadness and terror as the shadows wrapped around her form and pulled her back in. The tears that fell from Lyra's eyes in that moment never ceased for one day or one moment. She played her music... played Bon Bon's music, wandered lost and listless across the land. The passionate notes brought many suitors seeking her hoof, but she would have none of it. Months turned to years, and never once did her crying or her playing cease.There came a day when her suitors had had enough. They cornered the unicorn, demanded she choose somepony. Demanded she love them. But she could not. Enraged, they assaulted her with everything they could find. But their rocks and sticks fell short, refusing to strike the player of such transcendent music. Furious, the set upon her themselves, striking with head and hoof, opening cuts all across her body. With one powerful buck, a deafening crack filled the air. The music had stopped - Lyra's horn had shattered into dust. Everypony stared at the mangled mess of a mare they had created, shaking their heads in disgust and scattering. What good was she now? Lyra winced, but bore the pain. "I... will give up... everything...""For me?" Bon Bon's voice floated over the grass into Lyra's ears. Lyra closed her eyes, and swore she could feel the other mare's breath against her neck. She smiled, and drifted away in the night air. Her gift was gone forever, but she could not remember a time she had been so happy...