User blog comment:FairyRaven/Fairy Tail Chapter 399: Wings of Despair, Review and Commentary/@comment-24744901-20140909173558/@comment-24800928-20140909185815

well END vs Acnologia vs Igneel could be a good fight.

Acnologia probably came because of all the Zeref demon energy whatever majigger thingy (lol). Acnologia's appearance is a shocker to everyone, since everyone expected him next arc.