User blog comment:IamJakuhoRaikoben/Chapter 474: In the Moment of Complete Silence, Review./@comment-109.246.140.177-20160224225722

There is something that people are forgetting. In Ultear's flashback, Hades told her that she could become the master of time itself (or something like that). Thus, it is possible for her to come back after mastering Arc of Time magic.