Two months ago, just a week after the incident with the sudden ominous fissure in the skies that resulted in the outpour of the Inferno Dragons that caused few casualties, many injuries and lots of destroyed infrastructure, Xavier Chrono, Head Dean of Arcana Academy, locked down the prestigious Arcana Academy until further notice.
Why he had done this, no one really knew.
But Aiden and Flynn, already informed by Xavier that the irregular fissures were getting more and more unpredictable due to obvious reasons (the incoming invasion of the Demon King), he had to close down the Academy to prevent as much casualties as he possibly could.
Despite being immensely powerful, Xavier unfortunately, couldn't be everywhere at the same time, much less an academy where multiple innocent students were gathered.