User blog comment:Omega natsu2/Chapter 387: Tartarus Arc, Part 4: Father and Son, Predictions./@comment-24784846-20140530224650/@comment-5233713-20140531165615

But that would explain why he was so dead-set to kill Deliora himself and why Ur said she willl seal away his darkness by taking on the demon by herself.

That even makes me wonder was it ever stated how Juvia's parents died? (.__.) Just a theory again, but that would be sooo sad!