Balmung

In Germanic mythology, Gram in Norse legend, or Balmung in the Middle High German epic poem Nibelungenlied, is a magical godlike sword, specifically the sword that the hero Sigurd used to kill the dragon Fafnir. It is primarily used by the Völsungs in the Völsung Cycle, however, it is also seen in other legends, such as the Thidrekssaga in which it is wielded by Hildebrand.