There are many buildings nearby, but this Magic Tower is the tallest and most conspicuous one.
Generally, after Mages complete their first class advancement, they can enter the Magic Tower to further their studies in magic, learning at least one high-level spell. Additionally, they can choose to learn different types of spells based on their own needs.
After advancing to The Great Mage, most of them would choose to enter the Magic Tower and forget some of the spells they previously learned to systematically acquire new spells that suited their own tactics.
Inside a Magic Tower, there are at least thousands of spells to choose from. Typically, The Great Mage emerges from the Magic Tower as if they have undergone a complete transformation.