Ridill

Ridil ( an. Riðill ) or Refill is in Norse mythology, the sword with which Reginn according to the Edda song Fáfnismál his dead brother Fafnir, who had assumed the form of a dragon, the heart cut out after his foster son Sigurd had slain this:

" Regin went to Fafnir and cut his heart out with the sword, that is Ridil, and then drank the blood from the wound. "