Mountain of Shadow: Crystal Link

This story is set in the far future, a thousand years after an asteroid has destroyed civilization. Tia has just begun her life. She has trained to be a healer, although she wanted to learn magic. All she has in the world is her training and her giant draft horse Dollar. Then a fabled Eldaran rides in, seeking a healer. He has a magic crystal. Maybe they can make a trade . . . if she is willing to give up all that is familiar . . . perhaps forever.