Editing Fáfnir (section)

===Völsunga saga===
[[File:Sigurd.svg|350px|thumb|Drawing of the [[Ramsund carving]], depicting the story of Fáfnir]]
[[Völsunga saga]] presents the most cohesive and extensive account of the Sigurð tradition and its author likely had access to the Poetic Edda as a source.{{sfn|Ney|2012|p=83}}

Within it, Fáfnir's brother Regin recounts to his foster son Sigurð a story closely following the version in the Poetic and Prose Eddas, in which Odin, Loki, and Hœnir had to pay a large amount of gold as weregild for the killing of Ótr, who in this account is described as having the likeness of an otter by day. After the gods gave the gold to Hreiðmarr, Fáfnir killed his father Hreiðmarr to get all the gold for himself, venturing into the wilderness to keep his fortune. There he became ill-natured and greedy and so became a worm and took to ever lying on his treasure to protect it.{{sfn|Völsunga Saga|loc=Chapter 14}}

Plotting revenge to get the treasure, Regin sends Sigurð to kill the worm. Regin instructed Sigurð to dig a pit where he could lie in wait under the trail Fáfnir used to go to drink and stab him with the sword [[Gram (mythology)|Gram]] as he crawls over the pit. Regin then ran away in fear, leaving Sigurð to the task. As Sigurð dug, Odin appeared as an old man with a long beard. He advised the warrior to dig more than one trench for the blood of Fáfnir to run into, and then disappeared. The earth shook as Fáfnir made his way to the stream, blowing poison before him. Sigurð, waiting in the hole below, stabbed Fáfnir in the left shoulder as he crawled over the ditch, mortally wounding the worm who thrashed about with his head and tail. As Fáfnir died, he spoke to Sigurð and asked for his name, his parentage, and who sent him on such a dangerous mission. Sigurð in return asks the dragon questions about lore as in Fáfnismál. During this, Fáfnir figured out that his brother, Regin, orchestrated his killing and foretold that the hoard would also cause Sigurð's death.{{sfn|Völsunga Saga|loc=Chapter 18}}

After Fáfnir's death, Sigurð cut the worm's heart out with the sword Riðill and Regin returns, drinking his brother's blood. Regin then asked if he could eat the heart, and agreeing, Sigurð roasted it on a spit. He touched it to check its doneness, and it burnt his finger. He stuck his finger in his mouth, and once Fáfnir's heart-blood touched his tongue, he became able to understand the speech of birds. He then overhears nearby birds warning him of Regin's treachery and advising him to eat the heart himself and kill Regin. Following their words, he ate some of Fáfnir's heart and saved some, before decapitating Regin with Gram.{{sfn|Völsunga Saga|loc=Chapter 19}}