User blog comment:FairyRaven/Fairy Tail Chapter 324: The One Who Closes The Door, Review and Commentary/@comment-5668006-20130322140718/@comment-4829046-20130322154342

FYI Erza was the only one who could activate Second Origin at will. Natsu and co. had to forcefully activate it, and they have been using it throughout this arc. Also he did come up with a new attack right?