Sigvald proceeded to murder his father in his sleep and departed for the Chaos Wastes, earning Slaanesh as his patron.
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Now, Sigvald marches at the head of an army devoted to himself, eradicating anyone he deems to be ugly, crude or irritating.
Some novels involving mostly Norse characters and places are C.L. Werner's Palace of the Plague Lord, Forged by Chaos and the Wulfrik, Valkia and Sigvald novels for Warhammer Heroes.