At the end of thew Tartarus Arc, Igneel revealed that the dragons (Grandeeney, Metalicanna, Skiadrum, Weissologia, and himself) have been living inside their adopted children to build up dragon anti-bodies and prevent them from undergoing dragonification. Since neither Cobra or Laxus were taught Dragon Slayer Magic by a dragon, and by extension didn't have a dragon inhabiting their bodies to create these antibodies, does that mean they will eventually turn into dragons like Acnologia? Personally i think a battle between Natsu and a dragonified Laxus would be epic, second only to the eventual clash of E.N.D. and Devil Slayer Gray.

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