He was killed by the sword Gram, which was made by this creature's brother.
This figure warns his killer that he will be drowned if he is careless in crossing the sea and tells him about the island of Oskapt; that killer refuses to tell this figure his name or family. This figure wears the Helmet of Terror, owns the swords Ridill and Hrotti, and can breathe poison. His most notable possession was used to cover the dead body of his brother. To kill this figure, a hero was advised to (*) dig more trenches so he wouldn't drown in this figure's blood; the blood running over him made him invulnerable instead and gave him the ability to understand birds. He was killed by the sword Gram, which was made by this creature's brother. This creature killed his father Hreidmar to get the gold of Andvari. For 10 points, name this brother of Otter and Regin, a dragon who was killed by Sigurd in the Volsung saga.
This figure warns his killer that he will be drowned if he is careless in crossing the sea and tells him about the island of Oskapt; that killer refuses to tell this figure his name or family.
Fafnir