At first, it was only New Athens. From the Temple of Eternal Flame, a giant line of energy shot up towards the sky.
The people around the city started to panic, but soon came an announcement, which called everyone down.
Now they watched in awe as the energy reached its apex, and spread in a circular direction. Slowly, a large dome of energy encased the entire city.
The energy barrier ended about a hundred meters from the city wall, but it didn't stop.
The energy burrowed into the ground, encasing the city not just from above, but from below.
A few seconds after the barrier was fully established, it became transparent and invisible. Out of curiosity, some soldiers shot at it, but the projectiles were stopped with ease.