User blog comment:Stone Roger/Natsu and Zeref have somekind of relation?/@comment-5299815-20120912185258

Simple as pie. There are 2 more worlds (not counting seirei world) besides Earthland until now, that is Edolas and the world where the "demons" are, but those "demons" are actually dragons. (the one that The Dragon King Festival presumably opens a portal to). So, each dimension has their own version of the characters, as Edolas counterparts, the "Demon Realm" would have counterparts too, and the counterparts for the Dragon Slayers are actually Dragons. These dragons (demons or whatever) were released by Zeref long time ago, and Zeref acquired some kind of relation with one of them, and that would be Acnologia, who teached Zeref all his "death" magic. The dragons made up the so called war in the past, and all that bad stuff. Then, to defeat these Dragons up, some people started to "mimic" these dragons, trying to learn their magic or whatever. Those were the original dragon slayers. Those Dragon Slayers defeated the dragons where is now currently that place Gajeel was. Though, these dragons had "childs" who were still eggs in Earthland. After those dragons born, they lived in the Earthland "hidden" in Earthland. Sometime in their lifespawn they must have encountered human families, and most probaly killed the "parents", but not the kids, and those kids they have raised themselves, teaching their owns ways to survive, making more Dragon Slayers. Though when it was year X777, someone discovered a way to open the portal once again, and it involved seireis in some way, and of course involved Layla, which ended up dead. So the dragons who would actually go back to the "demon" realm, were "helped" by a now "good" Zeref, who was separated from Acnologia in some way, and the dragons were sealed inside those kids body, making them disapear. Zeref must have know Natsu this way, and somethin must have happened between them. So when the dragons got sealed in the kids body, their actual ages were summed with the kids own age, making them much over 80, and then explaining why they couldn't pass trough Freed's barrier. I forgot to say up there, but Acnologia and Zeref must have had some kind of fight and got separated, as Zeref was getting "corrupted" by Acnologia and doing bad stuff, and once he got away from him, he started to become "good", but with the price of having his magic kinda discontroled. So now, in year X794, Arcadios is trying to release more dragons from the "Dragon Realm", for prolly trying to rule the world, making day never coming out again, explaning why it is called Eclipse Plan. So, all this is kind of my CRAZY AS HELL theory for what happened in the past, kinda not really focused in Zeref relation with Natsu, but it covers it too. So hope you've enjoying reading this awfully big chunk of words, and got some ideas for what's actually happening.

Ciao!