Cursed 2nd princess (Axiel was it?) is also a war hero and has a man of very high standing for fiancee. That is plenty of ammunition to make a challenge for the throne.Also, it seems clear what Ariel is planning. She wants to utterly ruin you because she's the villain of this story. Not sure why, though. Politically, you're beneath her, as she's the first princess and you're only the daughter of a consort. Hardly seems like you pose a political threat to her, so why should she bother? Unless there's more to it than meets the eye.