User blog comment:Water Dragon Slayer Shawn/Theory on why Gajeel and Natsu couldn't pass Freed's barrier./@comment-32.210.6.95-20150827045309

E.N.D is Etherious Natsu Dragneel. Not Evil Natsu Dragneel. But idk the story behind gajeel but natsu is zerefs younger brother. Zeref's name is actually Zeref Dragneel. Look up Zeref Dragneel and it will tell you that whole story. Natsu is 400+ years but he actually died and was brought back by zeref. I still don't know the story behind gajeel but yea that's why natsu couldn't get through!