2am thought?
Would Diaval have a weakness to iron? Diaval isn't a fey creature, he was born a raven. But he has been affected and directly exposed to magic for over 20+ years, so would that have a long term effect on him?
Maybe its like he's been slowly contaminated/changed by Maleficent's magic overtime, the more he transforms, the more his body grows used to the transformations and the magic associated with it. He becomes used to it on a deeply physical level. And with that change, he essentially develops something akin to a allergy to iron.
I don't think we ever see him touch iron long term in either movies? And he never came into direct contact with the iron dust/powder in the second film. (Im going off of pure memory with this claim.) Sure the guards who are covered in iron armor hold him down at one point, but other fey in the movie either were able to tank a few iron contact moments, or depending on the size, only had a 'small' reaction. (Borra holding the iron bolt, Conall surviving for a good while after being shot, Some Dark Fey flying through the edges of iron dust clouds in the 2nd movie when the fey next to them got hit.) (Adrenaline could also explain why some reactions differ, excluding direct contact with the iron dust.)
Even if he isn't shown to be affected by iron, I'm just gonna headcannon that he is. Because I think its cool for him to kinda develop fey traits after having long term super powerful magic exposure. (Maleficent is essentially Dark Fey Creator Reincarnate, her magic is canonically the strongest, that has to account for some magical weirdness.)
