In 23 AD, towers appeared worldwide with timers set upon them. The timers were set for two thousand years and gave grave warnings about items on the top floors that needed to be reached by the time they equal zero. The odd thing about the towers is that some people could see them and not. Inscribed on the towers are runes, and after a while, the ones who could see the towers deciphered enough of the text to determine the tower were being hidden by advanced magical spells. The towers emit Mana which some humans can tap into, allowing them to see the buildings and cast spells. Since the towers were not visible to all humans, a divide started to form between non-mana users and mana users. The non-mana users or Nonmagi refused to believe that mystical towers could have just appeared out of nowhere.

The areas where the towers were standings seemed to repeal any Nonmagi that traveled too close to them unnaturally. This denial caused a great chasm between the two people, and eventually, society split, and Nonmagi and Magi all started to live two different existences. The Magi stopped discussing the towers and all magic-related subjects in front of Nonmagi. At first, Magi were at a loss regarding how to deal with these towers. Most people were cowards at the thought of entering the dungeons. However, parties eventually formed and ventured into the dungeons to scale the towers. The adventures that ventured into the dungeons quickly learned that monsters they defeated carried items of great value, and the higher the floor level, the higher the item’s value.