Boom!
This time, it was merely the power of two energy crystals. The precise long-range built-in aim allowed the energy cannon to hit their targets instantly.
A green 'jar cannon' exploded, and the accumulated energy inside it also exploded on the top of the city wall. Combined with the power of the horse cannon, everything became a mess, and angry screams, as well as roars, could be heard. Among the four jar cannons that were in the midst of accumulating power, one was destroyed, while two of them were deflected by the blast. Only a lone green cannon managed to fire at them from the most remote corner, and an explosion hit the gray fog.
It was a single shot; thus, although Mu Zi found it uncomfortable, it was still tolerable for him.