User blog comment:CNBA3/My Big Three Theories!/@comment-31.132.65.54-20150219000310

I personally stopped creating theories for Fairy Tail after it turned out Jellal was one of the Face keys (which made little to no sense). But I see you put some effort into writing this, although I see some chronology and age issues with it.

The main thing is that we have Natsu Dragnel and END which stands for Etherious Natsu Dragnel, so does it mean that Natsu was the first one or some sort of prototype and END was created after him? That would mean Natsu is over 400 years old, since Igneel fought END and failed to killed him 400 years ago. Zeref when he meet with Natsu inside the Tartaros cube talked about END as if it and Natsu were separate beings.

Maybe Natsu is the "essence" and END is the "form". Zeref wanted to create a being that could kill him and have a relation with Natsu. Zeref began to have doubts that Natsu will be able to kill him, so he created something to help him, but something went horribly wrong. That would explain why END needed to be sealed off and why Zeref insists on Natsu to kill him.