According to norse mythology, Tyrfing (note that it was originally spelled just like this, without the h) was a royal sword smithen by the dwarfs Durin and Dvalin for king Svaverlame, Odin's grandson. But as the work was done under compulsion, the dwarfs cursed the sword so that it would become the death of Svaverlame, commit three outrages and become a man's bane whenever it was pulled. The man or woman who carried Tyrfing would himself eventually die by it, thus passing the curse on to someone else.