User blog comment:Miskos3/Fairy Tail Chapter 318: Gajeel vs. Rogue, Review/@comment-121.54.8.130-20130210131509

what happened to future Lucy was what happened to Zeref in the past.. Zeref was the first stellar spirit mage and by using eclipse 400 years ago became cursed and lost the zodiac keys. That's why Jellal senses Future Lucy's power is similar to Zeref.