User blog comment:LegerPrime/Duel-Element Dragon Mode/@comment-4636509-20160930130523/@comment-24734624-20160930214839

I know. I thought it'd be funny if Natsu would come up with the name, thinking it'd be another acronym for E.N.D. But at the end of the arc, he'd find out "Inferno" starts with the letter "I".