There were many types of full-time Mages, and the specific number of types might vary according to the settings of different works. In some works, magic can be divided into a number of different branches or schools, each branch or school has its own unique magic skills and characteristics. In other works, the magic department was simply called "magic college" or "magic department", which included many different magic skills and schools of magic. In fact, the number of full-time Mages in the Magic Department might vary according to the settings of different works. For example, in " Battle Through the Heavens ", the magic element was divided into seven elements: fire, water, thunder, earth, wind, and fire. Each element had its own unique magic skills and characteristics. In Harry Potter, the School of Magic was divided into the School of Witchcraft and Wizardry, Hogwarts School of Witchcraft and Wizardry, and other magical fields. Each field had its own unique magical skills and characteristics.