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Actually, the wedding was interrupted, and one becomes queen after the coronation, not after the wedding. Nicholas didn't just fail to defeat three demons; he sent the entire huge demon army to Shi'o and died at the hand of Agrail only because Agrail, thanks to his love for Isabel, was probably already half-demon by that point. So, everything is very logical; the only illogical thing is that they removed Ra'ylag from the Tribes of the East.
