Die Nibelungen: Kriemhild's Revenge (1924) on Netflix

Plot summary

Kriemhild has lost Siegfried and wants Hagen Tronje dead for it, but her brother King Gunther will not give him up. When Etzel, ruler of the Huns, asks for her hand, his ambassador Rüdiger von Bechlarn brings the proposal, and she agrees only after Rüdiger has sworn on his king's name that she will never be harmed. Hagen hides the Nibelungen treasure at the bottom of a lake. Kriemhild takes soil from the place where Siegfried fell and sets out for the Huns' court, where Etzel welcomes her and makes his own promise to defend her. After she gives birth to a son, Etzel returns to his realm and offers to grant whatever she wishes; she asks that her brothers be summoned to his kingdom.