User blog comment:IamJakuhoRaikoben/Chapter 487: The Third Seal, Review./@comment-24102956-20160531053015/@comment-24734624-20160601010011

It seems Dragon Slayers can also enter Dragon Force by eating anti-Ethernano.

I hope Zeref opens the book of E.N.D., E.N.D. posseses Natsu and burns either Irene or August to death with his Etherious powers.