User blog comment:B214/Volume 17 spoilers./@comment-1359322-20140220010922/@comment-1359322-20140225004324

To be honest, we still don't know yet. In Volume 16, Issei revealed that the Dividing Wyvern Fairy can now only [Divide] and [Reflect], then right now in Volume 17, it's said that it could use [Boost] too, which is perhaps for the [Longinus Smasher].

Any more info will have to wait till the translation.