Should I post my book of magic?

Hello! I'm working on an epic fantasy saga, and one of my publications is actually a book of magic.

Technically, this Magic Codex is fiction (part of the saga), but the concept is sort of an in-world non-fiction reference book, compiled through the ages by scholars of magic.

It defines and explains all the different magics, organizing them into a flexible taxonomy (like our taxonomy of species), and as new magics are discovered in-world, they are added/organized (and the taxonomy is sometimes restructured) to incorporate them. It goes over the various branches of magic, details each magic spell, and even delves into rare magics, evil magics, and unnatural creatures like wraiths, etc.

Anyway, would this be something cool to post to RR? Or should I just stick to the actual stories?

Thanks for any input!