Assault on the Magic School

Old legends tell that many, many years ago, some of the wizards who were students at the famous School of Magic and Sorcery succumbed to the one who must not be named and were forced to create a secret portal within it. This portal would allow, after centuries, the Death Eaters to access the school to seize all power and destroy everything in their path. But don't worry, hundreds of years have passed since that legend... or was it just a legend?? You are a group of wizards that the school is waiting for since you have very advanced powers. You are alone because all the students and teachers have been kidnapped. The Death Eaters have rebelled and stormed the school to open the dark portal and be able to take control of the castle, therefore, now the fate of everything is in your hands. The headmaster and all the faculty have cast a protective spell to prevent the Death Eaters from accessing and activating the portal, but it only lasts 60 minutes. You have that time to find a way to destroy the portal and prevent them from seizing power.