For 10 points, name this dwarf whose greed turned him into a dragon, who was slain by Sigurd.
As he lay dying, this figure told his killer about the uncreated island of Oskapt, where the gods and Surt will mingle their "sword-liquor." This figure owned the sword Ridill, which was used later to cut his heart out. His slayer had to dig many trenches for his blood to run into and gained the ability to understand birds after tasting this figure's blood. This son of Hreidmar counted among his possessions the Tarnhelm, or helm of terror, as well as the cursed hoard of Andvari. He was dealt a mortal blow by the sword Gram as he slithered over a pit containing a hero coached by his brother Regin. For 10 points, name this dwarf whose greed turned him into a dragon, who was slain by Sigurd.
As he lay dying, this figure told his killer about the uncreated island of Oskapt, where the gods and Surt will mingle their "sword-liquor."
{Fafnir}