User blog comment:Jho5689/Fairy Tail 337 and onwards/@comment-11232389-20130625163146/@comment-1359322-20130625171406

Exactly, in the 10,000 Dragons future, the gates were opened and the Dragons destroyed humanity, Future Lucy and Levy somehow survives and Future Lucy returns to past. In Acnologia future, the gates were closed by Lucy and Acnologia appeared and dominated humanity becoming its ruler, Future Rogue created magic to control Dragon but ineffective to Acnologia, he then somehow finds out about the 10,000 Dragons and return to past.