"There were many reasons."
"For instance, timing."
"The demon army's assault on Black Prison presented a once-in-a-thousand-years opportunity for coordinated action from within and without. So long as their minds had not completely withered in Black Prison's bleak environment, the inmates would certainly try to answer the army from Outside the Realm and gamble for a chance at survival."
"Then there was terrain."
"The school's pre-Timeline operation had firmly confined the causal lines to this segment of time within the world of Black Prison, amplifying the Hell Equation's power and creating an ideal environment for those prisoners to activate that Magic Circle."
"Simply put, it was like wrapping a thick iron shell around an ordinary paper lantern. Once the Explosion Talisman inside the lantern ignited, the blast became much more powerful... same principle."
At that, Hun Buyu withdrew his gaze and pointed down at the two layers of formations beneath the outer castle. "Of course, there was also the most important factor: the people."
"The prisoners of Black Prison did not want to die."
"Though they activated the Hell Equation, that did not mean they truly wanted to perish alongside this world and Black Prison's wizards. Demons with the courage to die in battle would not have been captured and thrown into Black Prison."
"On the contrary, this was an extremely clever form of coercion... because they knew that the Archwizards and even Legendary Wizards currently in Black Prison would not allow this world to fall into The Void."
"It could create a battlefield more suitable for demons while tying up more of the wizards' strength. If I were not standing on First University's side, I would almost raise a toast to the demons who devised this plan."
"After spending so long in Black Prison, even a muscle-brained