The Nibelungenlied is a medieval German epic about heroism, betrayal, and revenge. It follows Siegfried, a legendary hero who is murdered through treachery, and his wife Kriemhild, whose grief turns into a relentless quest for vengeance. Years later, she marries King Etzel (Attila the Hun) and lures her brothers and their warriors into a deadly trap. The story ends in massive tragedy, with nearly all major characters killed, emphasizing the destructive power of pride and revenge.