Vikings season 6: Bjorn Ironside and Ivar the Boneless to die in shock ending?

VIKINGS is heating up its plot points as the end of season six comes to a close. But with two of the remaining Lothbrok sons meeting up, it looks like a war between siblings is just around the corner. But will any of the Lothbrok boys survive the impending war or will they instead all perish in the final season?
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