There were various types of mage towers. An example was the fortress-type, constructed especially for the battlefield. These fortress-type mage towers were rather simple in design and were typically designed to be shared by many mages. There were also research laboratory-type mage towers. These would belong to an individual mage and usually contained all of the mage's accumulated treasures. But any type of mage tower would always be a super dangerous area.
Having a personal mage tower meant having one's own world. Not only would the mage tower massively increase the mage's combat power, all sorts of esoteric and high-level magic spells would become much easier to cast due to the support of all the expensive magical ingredients, dimensional portals, batteries, and so on that a mage stored in their mage tower.
