User blog comment:Omega natsu2/Episode 196: Sin and Sacrifice, Review./@comment-4933386-20140823045815

Juvia's water body becomes useless after the Phantom Lord Arc. Every single enemies Juvia faces afterwards is able to pierce through/harm the body. But I think her body only works against solid physical attacks, so beams, elemental, or sensory attacks will work against it. Otherwise, she would be practically invincible if nothing can attack her.