User blog comment:FairyRaven/Fairy Tail Chapter 423: Do It All for Love, Review and Commentary/@comment-5303512-20150309233029/@comment-130.245.231.204-20150310014228

I feel like we have 2-3 arcs left:

Mini-Arc: currently on....doesn't count as a real arc..

1. Acnologia Arc: Acnologia recovers from his battle with Igneel and is out to find and kill END sensing his presence more then ever for some reason.....the reason being that Natsu has beef himself up so much that in doing so could potentially be aiding END awakening...but that's just a theory.

1+2 could possibly be combined into one long arc.

2. END Arc: During or after the fight with Acnologia, END awakens from within Natsu, as he has been sleeping within him this whole time trying to regain his demonic strength. END in turn will go on a rampage of destruction while searching for his father Zeref, while the gang try to figure out a way to stop END without killing Natsu. Gray will likely attempt to kill Natsu but will hesitate due to him not wanting to kill his best friend. Either that or Gray will be on the search for END and it could be a race against time to stop END and to stop Gray from killing END/Natsu.

After this either we jump to the third or we get a mini arc that explains what happened 400 years ago, how END became Natsu, how did Zeref become who he is now, and what led to Igneel adopting Natsu as his own while likely knowing that he was his greatest enemy. This could also be combined into both the first two arcs and the final one.

3. Zeref Arc/The Final Battle Arc: After END has been stopped and Natsu has regained control of himself (or Natsu "consumes" END and obtains his strength) a single man appears before Natsu to tell him that he is finally ready and that the time has come. When Natsu looks he sees his true father Zeref appear right in front of him and the FT gang. He tells them to prepare for The Final Battle" saying that it will be coming very soon (maybe the next day or several so then the gang will be at full strength when it happens) because Zeref wants Natsu at full strength when he fights his son and sees if the World (when I say this I mean Fate/Destiny) will choose his ways or Natsu's (When I say this I mean will the darkness consume all life, or will Natsu kill him and end the cycle of darkness). I see in this battle every Dark Guild in the world align with Zeref since he is like their God, while the guilds of the Light (The Legal Guilds) all align themselves with Fairy Tail as one Guild to end the darkness once and for all. For this arc you could almost see Zeref pulling an Aizen since he knows that either way he wins.  If he wins, then he destroys all life and the world can restart anew, if he loses then all of the dark guilds will end and the last source of darkness (Himself) will cease to be, which is what he wanted in the first place. Either way Zeref wins.

Epilogue: Natsu has finally defeated Zeref, and the world has finally entered a new era...an era of true peace. Without the influence of Zeref most of the dark guilds disbanded while some may try to gain power. The adventure continues......