Pyramids by Terry Pratchett (Discworld 7)

Djelibeybi really was a small self-centered kingdom. Even its plagues were half-hearted. All self-respecting river kingdoms have vast supernatural plagues, but the best the Old Kingdom had been able to achieve in the last hundred years was the Plague of the Frog*.

*It was quite a big frog, however, and got into the air ducts and kept everyone awake for weeks.

The seventh Discworld book is another book that doesn't neatly belong to any of the arcs, although it shares some similarities with the later Small Gods. It focuses on the ancient but tiny kingdom of Djelibeybi (jelly baby); its traditions, rulers, gods, and most especially as one can infer from the title of the book, its pyramids.