Christian @artforvalhalla made this fantastic Viking Shield plank for us, representing the death of Fáfnir.
In the Icelandic Völsunga Saga (13th Century), Fáfnir was a dwarf. His father was Hreidmar, King of the Dwarves, and he had two brothers, Ótr and Regin. According to the saga, the Æsir gods Odin, Loki and Hœnirand, killed an otter with a stone, not knowing it was Ótr in disguise. Hreidmar then held Odin and Hœnirand hostages until Loki brought as ransom the otter skin of Ótr filled with gold, as reparations for slaying is son. Loki fulfilled the task but gathered the cursed gold of Andvari as well as the magical ring Andvaranaut. Loki knew because of Andvari's curse, that the items would bring about death and destruction on whoever possessed them, so he offered them to the Dwarven King for the release of Odin and Hœnirand.
The gold and ring's curse caused greed and madness to possess the royal family. The dwarven prince Fáfnir killed Hreidmar, his father, seeking the gold and magic ring for himself, becoming very ill-natured and greedy, and going into the wilderness to protect his precious treasure. The curse eventually turned him into a wyrm, obsessed with guarding his treasure. He also breathed poison into the surrounding countryside, to keep outsiders away.
Regin, being denied his share of the gold, seeks out the aid of Sigurd, tempting him with tales of the dragon’s gold. Regin instructed Sigurd to dig and hide in a pit under a trail Fáfnir used to get to a stream for a drink, and plunge his sword, Gram, into Fafnir's heart. As Sigurd dug, Odin appeared in the form of an old man, advising the warrior yo dig more trenches for the blood to run into. As Fáfnir appeared, Sigurd stabbed him in the left shoulder, mortally wounding the dragon. But as Fáfnir lay dying, he told Sigurd that Regin would betray him and cause Sigurd's death, and warned him that all who possess the gold will be fated to die.
Sigurd didn’t believe it, but as he cooked Fáfnir's heart, he ate a few bites. This allowed him to understand the language of birds who advised him to kill Regin, because he'd been corrupted by the ring and was plotting his death.