

In the recent manga chapters, Natsu is seen fighting Gray, from Natsu's side,
he just wants to move forward to beat FT's enemies, and I understand that Gray
received his magic to kill END, but exactly why does he have to kill END? Did
they explain this and I missed the chapter?


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fairy-tail
Why does Gray have to kill END?


I haven't been following FT for a while, so would have to look for a
confirmation. But from the previous manga I infer it is because

> END (Natsu) is one of Zeref's demons.

Gray has a _very_ ugly history with Zeref's demons. One of them (Deliora?)
destroyed his hometown, family etc. Then the closest replacement to a parent
sacrificed themselves to save his life and seal the demon. He also learns his
father was basically kept alive as a Zombie by the demons.

Then something curious happens.

>   1. He gains the abilities to KILL demons  
>
>   2. He discoveres Zeref created all these powerful creatures to kill
> himself.
>

After learning the true identity of END as the last of Zeref's demons, Gray
decides to kill him for his revenge (aka Sasuke Syndrome)


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Gray is the only one that can kill END with his Ice Devil Slayer Magic as
there are no other Devil Slayers known at the moment so there is a lot of
pressure on Gray. On top of that, Gray's horrible history with Zeref's demons
also contributes to his decision.


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**Spoilers don't read it if you don't want to be spoiled.** Forgive me if I'm
wrong.

> So just adding to arcane's answer.. apparently in the manga it is revealed
> that Natsu is in fact the end and that he's Zeref's brother but died so
> Zeref has kind of brought Natsu back to life by making him as one of his
> demons. He also has made Natsu's memories of his family and Zeref himself to
> be erased. Apparently, if Zeref dies then Natsu will die too due to their
> 'unusual bond'. I don't know if this is true or not. Now, since Gray is the
> only one to kill the end he plans to kill the book of demons that Zeref
> owns, which of course will kill Natsu along with it.


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The premise of your question is wrong. He doesn't have to. He wanted to. He
wanted to kill END, but he actually doesn't have to kill END.

Okay, let me explain what I mean by the statement above. Gray figured that
Natsu is END. Does he have to kill Natsu? No. Natsu was perfectly human at
that time, and as long as he is human and have control of himself, there would
be no reason for him to kill Natsu. Besides, at that time the Spriggan 12 is
yet to be eliminated. Obviously Spriggan 12 is a bigger threat than END that
is clearly on his side. So, once again, he doesn't have to kill END (at least
not at that time) and he certainly shouldn't either.

But, Gray wanted to kill END. This is the difference. He wanted to kill END,
because END is one of the Demons of the Book of Zeref. Gray is obsessed with
killing all of Zeref's demons (and eventually Zeref himself) because Deliora
has killed his family and later his master, Ur. He is motivated by vengeance,
and this desires blinded him about the fact that END is a nakama. This is
proved by Erza managing to stop him by making him remember that no matter
what, Natsu is still Natsu.


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