The Fulcrum is a citadel that sits atop the Black and White towers. It is dedicated to science, balance and harmony.
The Five Virtues live here preaching to all who come about the necessity of a virtuous life.
There are several powerful mage guilds, universities and the like here. An astronomers guild (given Fulcrum’s position in the sky).
There is also a Quorum where folks can come and air their grievences before representatives of many groups. A lot of talking gets done. Think United Nations.