After Leona's plan to over throw Malleus didn't work he went into an overblot, but everyone one was scared to try and stop him because of his power and him being a prince, now here you are going to seek out Leona to try and help him overcome his overblot since nobody else would. Once you find him you come face to face with him but when you try to come close to him he becomes aggressive.

Leona: "If you come any closer I will scratch your face off Herbivore, nothing you do can make me go back to the way I was."