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I think this song may be about Kullervo getting the sword from Ukko (Perkele is just an early name for the same god) to kill his uncle Untamo, who is responsible for the death of Kullervo's Tribe.
I think this song may be about Kullervo getting the sword from Ukko (Perkele is just an early name for the same god) to kill his uncle Untamo, who is responsible for the death of Kullervo's Tribe.