User blog comment:IamJakuhoRaikoben/Chapter 439: Albareth Empire, Review./@comment-24277053-20150609162442

Here is a prediction of who the main bad guy is of this arc, when Mavis choose Percht has her successor over Yuyr, that left someone very bitter and over that bitterness, and that person left Fairy Tail went far away and vow vengeance, and that person is Yuyr Dryer's oldest son. Yuyr was cool with Mavis choose, he respected Percht like a mentor, but his oldest son was very angry, thought his father has been insulted and betrayed. So yeah the big bad is Makarov's older brother, who is probably the one that poisoned Iwan's mind and told him about Lumia Historia, we thought it was Percht, but it was Makarov bitter older brother.