The Probert Encyclopaedia of Norse Mythology

BALMUNG

In Norse mythology, Balmung (also known as Gram) was a sword of Siegfried, forged by Wieland the Vulcan. Wieland in a trial of merit, clove Amilias, fellow smith, through steel helmet and armour down to the waist; but the cut was so fine that Amilias was not even aware that he was wounded until he attempted to move, where upon he fell into two pieces.
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