Warrior Dean's Magic Academy

"Yuezhu Academy is a academy with a long history. Its history can be traced back to 2000 years ago, when the Fourth Era began." "The academy is located under the Sky Blade Peak, the highest altitude in the kingdom. There is an endless inner lake in the courtyard and the environment is beautiful." "Students can freely customize their own rooms; being in a natural environment, practicing natural magic will get twice the result with half the effort." "There is also a portal to another world in the courtyard! Help students reach the peak of arcane science!" "The most important thing is that Yuezhu Academy has the most powerful teachers, especially the dean!" "He is a legendary warrior!" ..... Wait, why is the dean of the magic academy a warrior?