Can a clear ciel crystal really be used
to make a barrier?

If they could, and we had enough, we'd be
able to make as many barriers as we wanted.

Then even areas that suffer frequent monster
attacks could be assured safety.

Yeah, but if it were possible, wouldn't
something like that have happened by now?

Maybe it's best not to get our hopes up about it, then.

Ever the realist, I see.

All I'm doing is speculating on the most probable outcome.

Actually, I think that's what being a realist means.