Provocation

Being hit by that terrifying attack, the fort's defense system was instantly roused, and the metal plates covering the entire fort shone brightly.

With the fort's railroad system acting as an array pattern, a large amount of energy started moving through the circuit, and the energy within the three large mana reactors erupted. 

In an instant, countless runes appeared in the sky, gathering together in a formation before dispersing a thin membrane of light.

A huge light barrier appeared around the fort almost instantly, with several profound runes roaming on top of it.

Dubois' lightning bolt turned into countless smaller bolts as it hit the barrier.

And as those bolts streaked across the barrier, they scattered once more into smaller wisps of lightning.

These remaining wisps either ran out of power or fell into the earth, absorbed by the fort's city walls.