In front of the Black Prison's outer fortress.
The Big Wizards from the school, including the five Upper House Members of the Moon Council, tried to interfere with the magic of The Duke Ulysses, but the Great Demons' relentless obstruction thwarted the Big Wizards' efforts.
One powerful spell after another was born, unleashed, and then dissipated halfway, with intense magic fluctuations spanning from the underground to deep space, from the wilderness to the deepest part of the inner fortress. The entire battlefield was like a boiling pot, making every being perceiving the Magic Power feel a heat burning from the inside out.
However, a few extremely potent spells did land on that Breeding Ground.