Ragnarssons And The Berserker's Daughters

In his final moments, Bjarke Skjeggestad asks for both of his children to be sent to Kattegat. Hillevi and Gerd grow up with Ragnar Lothbrok's four sons. However, despite being sisters, each will have a different destiny.
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One will thrive to be a fierce shieldmaiden. The other will develope the same berserker nature as her sire and serve a much bigger purpose.

( Vikings TV series fanfic)