User blog comment:IamJakuhoRaikoben/Chapter 497: The Winter Mage, Review./@comment-24951162-20160810202218/@comment-5303512-20160811130253

Last I checked, Mard Geer only lied about E.N.D. Being the guild master of Tartarus, nothing more.

Experiments don't always go as the creator wants, that is what happens hen you play God.

Last I checked, Igneel trained him to defeat Acnologia, not Zeref, Zeref alone believed that he would be able to kill him if he was with Igneel.

I don't see how having Natsu take on a Etherious form would be considered shitting.