Again, Fairy Heart has no limits. Even if Zeref has limits, Fairy Heart does not. It's literally infinite power. Natsu had to burn this infinite power away in order to stop Zeref from turning back time. There's really only 2 ways to look at this. (1) Natsu overpowered infinite power, which should put him at universal level using real world physics. (2) Natsu overpowered infinite power, and we agree that Hiro Mashima isn't the best scientist in the world and just rank Natsu based on the size of his attacks. Whatever option we choose to use for Natsu should apply to every other character in the series.He just burned away FH which is what supplies infinite magic to Zeref who cannot even defeat Acnologia even in that state. So there is obviously a limit which FH is. In order to do that he has to bypass Zeref’s time magic which would make any attacks relatively ineffective. There is the thing called scaling which is what we use here and call that NLF. Being friends makes Igneel just as evil as Zeref was if he is as ignorant as even Mavis was in the beginning. Being under the influence of the curse does not exempt him from his wrongful deeds. In the end it is not a matter of strength, it is about the type of power it is that can defeat Zeref’s immortality. Acnologia is stronger and even he cannot kill Zeref (even with FH). Do you not see the flaw in your reason? Just like how Dimaria’s magic could ont be surpassed by certain powers as well. Which should be obvious enough
Igneel wasn't evil or ignorant. Zeref wasn't evil 400 years ago. He wasn't evil until Tenrou Island when he decided to kill everyone. Zeref was Igneel's friend, so Igneel had no reason to kill him. Fire in this series has been known to burn magic. We saw Igneel's power burn away Zeref's magic, so it stands to reason that Igneel's powers could kill Zeref by burning away the curse keeping him alive. Acnologia might not be able to do this because he doesn't use fire. None of this changes the fact that raw power is the major reason why Igneel's power can kill Zeref. If the attack isn't strong enough, it simply will not even get past Zeref's defenses. Let alone kill him. END's attacks can be blocked barehanded by Erza. It will be blocked by Zeref just as easily. Let me put it this way: Even if Zeref wasn't immortal, I still don't see any way END's power can kill Zeref.
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