The Jomsvikings is a powerful band of Viking warriors based in Jomsborg on the Baltic Sea. Unlike other Viking bands, they function more like a military unit. This includes displaying more organization and discipline and wearing the same clothing and armor. Their distinctive weapon is a dark single-bladed axe with an eye pattern engraved on the head.

Thorfinn is related to the nobility of the Jomsviking leadership through his mother Helga, the daughter of chief Sigvaldi and niece of his brother Thorkell. Thors was the most renowned Jomsviking warrior prior to his defection.

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