Tyrfing
Tyrfing was a sword that appears in the poem from the Elder Edda called The Waking of Angantýr. In Richard Wagner's opera, King Alberich gave to Odin.Tyrfing was a cursed sword, and bore the misfortune that each time it was unsheathed, a man must die
Swafurlami, a king of the seed of Odin, forced the dwarves to forge the sword Thyrfing (ripper). They laid on it a curse, that it should bring death to its bearer; that no wound made by it should be healed; and that three deeds of woe should be wrought by it. Swafurlami is slain by Arngrim, who inherits the sword. Eyfura, his wife, has twelve sons, all of whom become Vikings. Angantheow, the eldest, and his brothers, are eventually all slain near Upsala by Hjalmar, and his brother Arrow-Odd; but Hjalmar, being wounded by Thyrfing, has only time to sing his death-song before he dies. Angantheow's daughter, Herwor (by his wife Tofa) is brought up as a bond-maid, in ignorance of her parentage. When at last she learns it, the war-fury comes upon her; she arms herself as an Amazon, and goes to Munarvoe in Samsey, in quest of the dwarf-doomed weapon.