Tangentially - it's an absurdist character rich fantasy bound by a 70 generations old castle (or university? Well, no, but shade is thrown).

Not a clean fit to Dark Academia, but a lesser known and worthy forerunner.

Also, Jonathan Rhys Meyers, Stephen Fry, and many others in the 2000 TV adaption is good entertainment for anyone with a DA bent. - https://www.youtube.com/watch?v=wsPC8m4zo9g