User blog comment:EvanDude345rv5/Fairy Tail Chapter 358 Review : Magical Barrier Particles/@comment-117.227.52.242-20131103003505/@comment-5580383-20131104021048

Normal poison does damage to the body in standard ways, Magic destroying poison damages both body and magic power

The fact she was only hit by normal magic poison, she never shown any resistance to higher levels of magic poison,especially that which can attack the magic in your body.

Dragon Slayers are proven to be immune to their element, unless it's God Slayer Magic. Laxus for example would easily tank Eneru's attacks from One Piece because it's normal lightning which Laxus is immune to or Natsu would be completely immune to fire based spells and attacks unless they're burning much hotter than he can withstand like Yamamoto's Bakai from Bleach.