Sigurd goes to Fafnir’s territory and digs a ditch to hide in and stab Fafnir from. Odin comes and advises him to dig several ditches for the blood to flow into. He does so, and stabs Fafnir through the heart as he crawls over the ditch. As Fafnir is dying, he asks Sigurd about his lineage and says that his gold and Regin will be Sigurd's death. Sigurd returns to Regin, who was hiding in the heather during Fafnir's slaying. Regin drinks Fafnir's blood and asks Sigurd to roast Fafnir's heart and let him eat it. Sigurd tests whether the heart is fully cooked and licks his finger, and suddenly understands the speech of birds. He overhears the nuthatches talking to each other about Regin's plan to kill him, and that he should rather eat the heart himself, kill Regin, take the gold, and go to Brynhild. Sigurd kills Regin, eats some of the heart, takes as much treasure as he can carry, including the Helm of Terror, and Andvaranaut, and rides off on Grani.