User blog comment:Omega natsu2/Chapter 387: Tartarus Arc, Part 4: Father and Son, Predictions./@comment-117.195.63.129-20140603064413/@comment-4489126-20140603142237

Hmm, I don't think Gray would like to acquire that Magic. I dunno, I just can't see him accepting that Magic.

And yeah, we'll get some info on Lumen soon~