Why did Natsu go Berserk? (Spoilers for Chapters 19, 20, 21 of FT100YRSQ)
For this theory to work, it will be based on another fairy tail theory by Seven Laila (You can find her here: https://sevenlaila.tumblr.com/). In short, Seven Laila theories that Lucy Heartifllia is the new author of the book of END, and now Natsu’s life is bound to Lucy’s (here is the theory: https://sevenlaila.tumblr.com/post/183154244024/this-is-going-to-be-pretty-long-but-please-read).) Of course, this explains why Natsu is still alive after Zeref’s defeat but, what are the further implications for this? By which I mean, what is END’s encrypted purpose now that Zeref is dead, and what does that mean for Lucy and Natsu? After all, the main goal of the Etherious is to kill Zeref.
In chapters 19-20 of FT100YRSQ, it is emphasized that if Mercphobia is not stopped he will inevitably destroy Elmina, as well as Team Natsu as well. However, Natsu is already very much aware of this
So in order to beat Mercphobia, Natsu has to eat (and he’s also coerced into it by Team Natsu) Ignia’s flames, but this is what ultimately triggered END’s curse power.
Many forget the special case Natsu is for an Etherious. Fundamentally, he is human because of his body (as stated by Zeref, who kept his body nice and preserved until he could reincarnate him). However, Natsu’s soul/life force is a different story; Natsu’s lifeforce needs to latch onto another because Natsu’s soul is remarkably fragile (it’s most likely based on ethernano but, that’s it). So because of his human body, and his attachment to Lucy’s lifeforce/soul (which is also weak because she isn’t immortal like Zeref and thus has a less stable and strong lifeforce compared to him), END’s curse power is now harder to control (sending him straight into bloodlust) and is even harmful to him.
Though why does Natsu suddenly decide to kill Mercphobia now? After all, Natsu likes him and states he is a good guy. Plus, when Caramille begs Team Natsu to kill Mercphobia, Natsu becomes very hostile towards her.
It’s because of E.N.D’s new purpose, to protect Lucy (and his other friends). Now, this is based on the theory that Lucy is, in fact, the new/another author of E.N.D and thus makes Natsu, in some ways, sworn to her. Moreover, Natsu has been always highly protective of his friends and especially Lucy. Thus, partially because of Lucy’s indirect influence over him, this urge to defend and protect them has been intensified; to the point where he thinks Mercphobia needs to be killed (as well as everything) in order for Lucy (and the others) to be safe.
Now, this makes Lucy’s “It’s Alright, I’m here” an even more powerful message. As essentially, she is telling her liege’s, Natsu’s, goal of protecting her, (and the others) has been accomplished and it’s why Natsu calms down. It’s also why he says this straight afterwards,
It’s over; this is a question he is both saying rhetorically in shock but also to Lucy as confirmation. I bet you if she told him that “no it isn’t over” in response, he would have just gone straight back into berserk mode.
E.N.D never disappeared, it/he just has a new master.
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