Under Kaseron and Zarlos's painstaking labor, large numbers of new pillars were driven into the underground magma, allowing Charles to draw upon even more elemental power.
During this time, Charles also successfully analyzed two Greater Demons' spell-like abilities, allowing him to cast fourth-circle spells in battle.
During this time, Charles restrained his aura, drawing devils from outside to attack his fortress.
Yet devil armies still came streaming toward Charles's fortress without end.
But compared to before, when armies of more than a hundred thousand or even several hundred thousand would arrive at once, their numbers were far too few.
In this state, Charles also pondered, Could it be that the devils around me have been slaughtered too badly, and none of them dare come anymore?
That was not impossible.
From the information Isata had gathered, Charles learned that when a layer of the Abyss collided with the first layer of Purgatory, the surrounding devil armies would immediately come to besiege the Abyssal Overlord of that layer.
Or perhaps the Abyssal Overlord of that layer would lead his legion into Purgatory to wage war.
This place was in the rear of the Purgatory world. There might not be any devils nearby powerful enough to rival an Abyssal Overlord.
Thus, an Abyssal Overlord would often run rampant for a long time.
Until he felt the time was right and led that layer of the Abyssal world away from Purgatory.
Or until some powerful devil marquises or dukes led their armies here to kill him.
After thinking for a while, Charles summoned Mark.
The moment Mark entered Charles's great hall, he dropped to his knees and said, "Lord Charles, your most loyal friend has arrived and awaits your orders."
Charles looked down at Mark and asked, "Mark, when will the spells I asked