User blog comment:FairyRaven/Fairy Tail Chapter 363: The Stories That Demons Read, Review and Commentary/@comment-112.133.212.13-20131206131123/@comment-7418318-20131206141433

Ivan's comment about it being hard to motivate Obra into using his powers and Flare also acting as if it was far more powerful than it let on at the MPF would hint at that thing actually being powerful even without the ability to suck out other's magic...

But the ability to suck out magic alone would be enough to explain how Igneel failed to kill it, if it really turns out to be E.N.D.