User blog comment:Omega natsu2/Chapter 368: The Third Seal, Predictions./@comment-4933386-20140120162841/@comment-24066070-20140121171108

I wonder what Face does when it explodes.

Will it destroy the ethernano in a wide area? How wide would that area be?

Or will it (permanently) disrupt a mage's ability to use magic?

If it just destroys the ethernano in Fiore, chances are that the ethernano existing outside the kingdom will eventually replace the destroyed ethernano,

This would leave mages powerless for a while, but means they could stage a counterattack if Tartarus doesn't finish them all before the ethernano returns.

And what about the magic existing in the Spirit Realm? That will likely remain untouched, so Spirits may still be able to use magic in Earthland or they could transfer mages to the Spirit Realm and use the difference in how fast time passes to bide time until ethernano returns to Earthland.

Taking these things in mind, the launching of Face may not be certain defeat for mages.