User blog comment:IamJakuhoRaikoben/Chapter 445: The Ugly Fairy, Review./@comment-24228963-20150718064255/@comment-24784846-20150718193219

I understand that END is very strong, I can even agree that Lucy is far from beating him. However Zeref said that Igneel was unable to/couldn't kill END. All I am trying to say is that nowhere does it say Igneel actually fought END.

As for Lucy's possible way to win. I think she could if she got certain power-ups. I mean we have the whole Star Dress thing that could be possible with Celestial Spirit King and maybe the One Magic and Fairy Heart could help? That combination seems good and strong.