Laxdæla Saga - The Curse of the Leg-Biter
The sword 'Leg-Biter' (Fótbítur) is a legendary weapon that brings misfortune to those who wield it. It is stolen and recovered several times, eventually being used by Bolli to kill his foster-brother Kjartan, sealing a tragic fate for both and illustrating the theme of an inevitable, cursed destiny.