The main reason why progressing beyond the second wall was so difficult was because of the towers. These weren't ordinary defensive structures. The towers were powered by immense amounts of high-level beast crystals, packed so densely that the energy flowing through them seemed limitless. From what could be observed, there was only around a two-minute interval between each shot before they were fully recharged and ready to fire again. That alone made them a nightmare to deal with.
But the energy output wasn't even the worst part.
The towers could move.
