"The-uh... the crystals! Yes! You'll need one of those to get through the shield. Crystal ponies can pass through it without one, but the rest of us aren't so lucky." Flash picked one out of the nearest box and tossed it to Spitfire, "Just keep it on you somewhere and you can pass through the shield. We've been stockpiling them for weeks now, just in case of something like this. We did think the attack would come from a different direction though."