Hair of a Demon, Heart of a Demon

When Harry an the gang are taken to Malfoy Manor, They meet and rescue a strange boy who the Death Eaters keep calling a half breed. Can they help him find his stolen sword? What do the Death Eaters mean when they say 'modified wands' and why is Voldermort so intently after this boy? Mainly HP cannon. Better summary inside. T for violence. ###SEQUEL COMING SOON! :D###