Bálburunn was found in a forest as a baby, taken in by the local madman. Her life is changed when she is introduced to Ragnar Lothbrok and his son Björn. She is a fierce warrior, even at the age of ten - deadly with any blade. Björn takes notice, promising to surpass her one day, despite being two years older. Björn x OC fanfic. Will eventually contain explicit scenes.