Fafnir (Marvel Comics) Odin, Fafnir uses the power of illusion and intends to devour the Asgardians. Odin's son Thor, however, defeats Fafnir by driving the dragon into a chasm using his lightning, after which he frees Volstagg. Fafnir reappears when Thor's stepbrother and perennial foe Loki sends the dragon to Earth to kill the Thunder God. Thor, however, uses his mystical hammer "Mjolnir" to hold Fafnir at bay until Odin intervenes and banishes the former king back to the ruins of Nastrond. Fafnir eventually returns to Earth, destroys several abandoned buildings in New York City and battles the National Guard. Thor and Elif,
Fafnir while cooking the heart, gained knowledge of the speech of birds and learned of Regin's impending attack from the Oðinnic (of Odin) birds' discussion and killed Regin by cutting off his head with Gram. Sigurd then ate some of Fafnir's heart and kept the remainder, which would later be given to Gudrun after their marriage. Some versions are more specific about Fáfnir's treasure hoard, mentioning the swords Ridill and Hrotti, the helm of terror and a golden coat of chainmail. Fafnir appears – as "Fafner" – in Richard Wagner's epic opera cycle "Der Ring des Nibelungen" (1848–1874), although he began