User blog comment:FairyRaven/Fairy Tail Chapter 368: The Third Seal, Review and Commentary/@comment-24066070-20140127014759/@comment-7418318-20140127204243

She was able to mould everyone's magic into the spell before, so why wouldn't she be able to do it again, except for being absent that is?

@Woest: For some reason I remembered that line as 500 times that of a regular bomb lacrima instead of 500 Jupiter. That is indeed a lot, though I think Etherion is still a magnitude stonger.

I'm also not confident in that assessment being accurate. If it really was THAT strong, why bother with installing it inside the guild? Something with that kind of power would level at least a whole city block, so placing it nearby would be enough to destroy the guild and minimize the chance of it being discovered before the detonation.

And as MDM already alluded, if can produce such weapons, why bother with Face at all?