Riðill (sometimes anglicised to Rithill or Ridill) or Refil is a sword that appears in Norse Mythology, possessed by the dwarf Regin.
Afterward, Fafnir's heart was cut out and roasted for Sigurd and Regin to eat.
According to Poetic Edda, Regin used Riðill to cut out Fafnir's heart.
But in the Volsunga saga, it is Sigurd who used Riðill and cut out the heart at that occasion.
You can help Wikipedia by expanding it.This article relating to a Norse myth or legend is a stub.