User blog comment:FairyRaven/Fairy Tail Chapter 388: Erza vs. Minerva, Review and Commentary/@comment-5668006-20140613153804/@comment-7418318-20140613154304

And with her element being almost everywhere (judging from her guild card she can't gain magic from polluted air though, so "only" almost everywhere) she's also the one who can fight for the longest, since she can just charge right back up at any time and thus won't run out of magic power... if only she realizes it.