User blog comment:Derax-Pagani/Fairy Tail Chapter 494: The Hill Extending Towards Tomorrow Review/@comment-112.200.38.15-20160723044801/@comment-7418318-20160723072955

In the Tartaros arc we already know that Acnologia somehow ripped the souls out of the Dragon Parents, though Igneel didn't say what Acno did with the souls, so that is quite possible.