Skofnung
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Skofnung was the sword of legendary Danish king Hrólf Kraki. It was renowned for supernatural sharpness and hardness, as well as for being imbued with the spirits of the kings 12 faithful berserker bodyguards.
It appears in saga unrelated to Hrólf, it being said that an Icelander plundered his grave mound and recovered it, so it may have had some historical reality. Events concerning it are related in chapter 9 and 10 of Kormáks saga.