So this is a fairly classic wizard’s tower. I wasn’t trying to reinvent the wheel here, but I did want to make it more interesting than your average, military-issue wizard tube.
The top floor has a telescope and an armillary sphere, which is basically a 3-dimensional astrolabe. It calculates the position and movement of stars. Beyond that, I’m not sure there’s too much to explain.
I drew a ruined version of this map for patrons, which should be done by tomorrow. After that, I’ll get back to drawing more of the Stygian City. Anyway, I hope you like the map. Let me know what you think!