"The effect is indeed strong. No wonder these mages always want to build their own nine-story mage towers once they reach the legendary level."
Reaching nine stories is already the highest level for a mage tower because it was designed to be nine stories from the beginning, which is already very complete. As for those with fewer stories, they are just inferior products.
In other words, only a nine-story mage tower is the true mage tower.
The mage tower internally contains a vast amount of magic power, and it is extremely pure. The recovery speed is very fast.
A legendary mage in their own mage tower receives a tremendous boost. It can be said that a mage with a mage tower is at least several times stronger in combat than one without.
It's important to note, this is at the legendary level, so you can imagine the significance of a mage tower to a legendary mage.
Of course, this is only the most unremarkable role, since fighting is never the most important thing for a mage.