User blog comment:Bato of the Heavy Iron Rock Hammer/Anime filler after GMG arc/@comment-24603221-20140912224314

Well, in addition to the Omakes, there is the novel which I read (and reviewed here), about Kemokemo, who Natsu got from an egg, which is set in the period of time between the grand magic games and the Sun Village arc. So, Mashima has put out quite a bit of material that could be used for an arc. And, even if is not part of the main series (people are talking about canon/non-canon like they were debating the holy scriptures or something), it's by the same author, about the same characters - and is part of the Fairy Tail universe.