User blog comment:IamJakuhoRaikoben/Chapter 503: The Last Sight Seen, Review./@comment-26389992-20160927234319

This chapter cleared up what Zeref was yapping about when he encountered Natsu in Tartaros... the whole "kill or let live" thing and how he said who will reach him first between Natsu or END. Could this mean that the demonic power of END can be vanquished? Gray might try to do that, and I'd be cool with that outcome. He's not END crazy and he helps out his best friend so both sides win