The fight between The strongest dark knight now and the corpse maiden started off with the two letting go of the restrains that they used to hold each other back in a fight.
The barrier above them was already cracking from the pressure around them; the dome covered the entire now 'ghost town' sealing whatever energy in it from affecting the outside out. Born from mainly sage healing magic and compositions like wind magic. Before, they were mainly used for magic tournaments and classification fights to avoid harming none magic users with radiation mana waves born from the intensive spike in magical activity.
When mana hits the peak of its wavelength, the only people capable of withstanding its effects were magic users having been born with mana cores that altered their biology as humans. This was known as the god effect, capable of shattering a none magic user's bones and twisting their organs if not careful.