Stranger
Dreamer
Hmm. What do your Barbarians do with their dead? If they burn honoured warriors in a bonfire, they could perhaps use the ashes to imbue swords with magical powers. It would be a limited resource, obviously, and maybe only certain warriors' ashes would be powerful enough to be used on weapons. Or the Barbarians could have a funerary ritual that makes them powerful. It would be a great insult for a Barbarian to be denied proper death rites in that case.