User blog comment:FairyRaven/Fairy Tail Chapter 435 & 436: The Cry of Victory & Memoirs, Review and Commentary/@comment-24784846-20150518115847/@comment-24784846-20150518121116

Is that what it is? Because that doesn't make sense either... I'm assuming Natsu died at a young age because thats when Zeref became curious. I assume thats why he wanted to understand it and complete the R System and Eclipse. However what I don't get is how he took Natsu's decaying corpse from how long and then made it into a demon? I'm sure Natsu wasn't alive so how does that work? Are you saying he technically re-animated his brother with a different thought process, turning him into an Etherious?