As suggested by the e.n.d of me, I am adding a short bonus chapter to this story. If you have neither read up to chapter 416 of the manga nor watched the anime up to the end of 2016:
~SPOILER WARNING~
On with the story!
Chapter 10: Zeref
This is certainly a turn of events.
My dear brother, my greatest Etherious creation END, Etherious Natsu Dragneel has been killed.
This certainly changes things. Do I attempt to create another being that could conceivably become strong enough to defeat me? No. There's no point. Natsu was the only one that could have had a chance at becoming strong enough to kill me. For he was once my brother. The bond that we once had cannot be replicated in some synthetic copy. The fact that he had died while still developing his power was unexpected. There was nothing to even remotely suggest this threat.
The only being that I was aware of that could have killed Natsu was Acnologia. But he has been surprisingly inactive these past couple of years. I've heard of some things, but for the most part, Acnologia has been silent and far away from both myself and Natsu. For him to have fallen at the hands of another, is it possible that there is another kind of magic that could kill me?
No.
This world seems hell-bent on preventing my death. The world rejects every desire that I have ever had and even took away my only chance at salvation after going to the lengths that I did to bring my little brother back to life.
For this reason, I will reject this world. I will personally light the fuse and watch it all burn. This curse of contradiction has taken everything away from me. So I will destroy everything in return. This will be the end of an era. Question is, who or what will rise from the ashes?