User blog comment:Warmachine375/Who is that mysterious hooded female Mage?/@comment-108.20.13.251-20140208071853

Actually i think this might be accurate. Its still a mystery but if you've seen the anime you'll notice that after natsu beats the twin dragons the person cries so it might very well be lucy since she might be remembering when she went through it. As for why the magic is similar to zerefs, your guess is as good as mine. My best guess would be that she wanted to gain massive power to go back and change either the past or save the future