User blog comment:IamJakuhoRaikoben/Chapter 345: Someone's Voice, Review./@comment-288216-20130726203812/@comment-7418318-20130726211838

Just look at the Dragon Slayers. There are other mages who are more powerful and can defeat Dragon Slayers quite easily (Makarov and Erza for example), but still those other mages are next to helpless against a Dragon and can't even put a scratch onto the scales.

And yet, due to the nature of their magic the Dragon Slayers, despite being less powerful, are able to hurt Dragons when the powerful mages can't.

It's similar between that guy's magic and Arc of Time. Arc of Time can restore or destroy entire towns so I'd count it as more powerful than his magic (or what we've seen of it so far anyway), but in this one aspect it can do something Arc of Time couldn't.