The Tower of Challenges had been one constant thing ever since the start of the Academy. In fact, it was also the reason that the Academy was started in this place in the first place.
Contrary to popular belief, the Tower of Challenges wasn't created by the Academy of Elements. It wasn't created by any mage of the Academy either. The tower existed here for as long as anyone could remember. No one knew who exactly made this tower or why.
By the time magic and magicians were becoming prominent in the world, the founders of the Academy of Elements discovered the Tower of Challenges.
The Academy of Elements was said to be founded by two friends who were quite powerful mages of their time. Ironically, one of those two men was a Mage of Light while the other was a Mage of Darkness.