I can't get enough of the Raksura series! Please recommend similar series that focus on social hierarchies, etiquette and protocol in fantasy worlds.

I just got done reading the Raksura series by Martha Wells (5 novels and 2 short story collections), and I need more. This series was the exact thing I didn't know I needed. What I loved most was not the exploration, action or characters (which were all pretty good), but rather the details of how Raksura society functioned. My favorite parts were the ones you had two different groups of Raksura interacting as per established protocol. The interaction between the various castes among the Raksura was pretty neat as well.

Could someone please recommend me books where there is a lot of focus on norms, etiquette, protocol and the interaction between social classes? I don't mean that they are very important (which they obviously would be), but that the book goes into a lot of detail about them. Another similar one I can think of is: The Goblin Emperor, which had a lot of made up words, customs, and norms with regard to the royal court.