It was no wonder the devils were astonished.
Millstone Fortress was simply far too large.
It was nearly comparable to the city of a devil count.
Yet the two embodied entirely different design philosophies.
Most devil cities were not purely fortress structures.
They were cities, with large numbers of residents living within them.
Countless devils, even hired outsiders from other worlds, lived in those cities.
But merely looking at the demon fortress before them made the devils' teeth ache.
This was utterly a fortress city, its towering walls linked together.
At regular intervals stood lofty towers.
The towers, too, were connected by walls.
And that was not all. Within were active volcanoes, each crater fitted with sorcery arrays that supplied magical power to the walls and towers.
Beneath some walls were even moats, and what flowed through those moats was nothing else—
Boiling lava.
Atop every crater stood a small or medium-sized fortress, while the mountains were also linked by walls.
There were no walls at the foot of the mountains,
But unless the fortresses on high were removed, marching along the foothills below—even through the valleys—would mean suffering attacks from the demons above.
Even a devil army could not possibly withstand such attacks.
The devil marquis surveyed the entire fortress from the air and was speechless for a time.
If the small and medium-sized fortresses on the outskirts were already troublesome enough, then every fortress farther inside was equally brimming with danger.
And the greatest threat was the core fortress: the original Millstone Fortress atop that towering volcanic crater.
That was the Millstone Fortress with the most complete defenses.
All the outer fortresses, indeed everything outside, were merely appetizers.
If the devils wanted to take Charles's core fortress, the outer walls and small and medium-sized fortresses could only be