User blog comment:IamJakuhoRaikoben/Chapter 449: Mavis & Zeref, Review./@comment-24264679-20150825020049/@comment-7418318-20150825064811

I seriously doubt Zeref is afraid of anything. Sure Etherion, Face AND LH supposedly discouraged him from invading sooner, but then he has literally all the time in the world, so he has no need to rush into a situation that would cost him too many of his soldiers that otherwise might be useful to him.