Laevatain

In Norse mythology, The elf Volund (Weyland), forged a sword so lethal that it imperiled the very gods themselves. The sword was taken from Volund and was brought to Asgard. They passed the sword into the hands of the god Freyr, who traded the sword for an unkown treasure. At Raggnarok, Surtr (lord of the realm of fire) wielded Freyr's sword and severed the roots of the world tree Yggdrasil with it instigate the destruction of the universe. Freyr would ultimately fall to his own blade. With it, he could have defeated Surtr and saved existence.

The sword was called Laevatain, made its wielder invincible in battle, could fight without being held, but was of course forged for the hand of a god.

The sword was also known as the "Wounding Wand" or the "Staff of Destruction".