The Prose Edda on Fafner
The Younger Edda: > Chapter Iv. > The Niflungs And Gjukungs.
attestation: Fafner and Regin conspired together and killed their father Hreidmar to obtain the gold
"Then the brothers made an agreement to kill their father for the sake of the gold."
attestation: Fafner refused to share the gold with Regin, arguing that having killed his father he would not share with his brother
"Fafner answered that there was but little hope that he would share the gold with his brother, since he had himself slain his father to obtain it"
attestation: Fafner possessed the sword Hrotte and the Aeger's helmet, which terrified all living beings who beheld it
"Fafner had taken the sword hight Hrotte, and the helmet which had belonged to his father, and the latter he had placed on his head. This was called the Æger's helmet, and it was a terror to all living to behold it."
attestation: Fafner went to Gnita-heath, transformed into a serpent/dragon, and lay brooding over the gold
"Fafner went to Gnita-heath (the glittering heath), where he made himself a bed, took on him the likeness of a serpent (dragon), and lay brooding over the gold."
attestation: Gold is called Fafner's bed or lair, the metal of Gnita-heath, or Grane's burden based on this saga
"gold is called Fafner's bed or lair, the metal of Gnita-heath, or Grane's burden."