Alfeimur is a rich and strange campaign world for your D&D3.5 game, unfortunately earlier works setting the scene have so far only been released in Italian... but here, in English, is a fascinating glimpse into this world. It describes the background and game characteristics of a human tribe, the Chakbash, who have adapted to a hostile underground environment despite being less well-equipped than most other sentient races found there.
The writing is evocative, mixing background and fiction almost seamlessly with the game mechanical information needed to create characters who are Chakbash. There's more, though, the notes expand to provide details of notable Chakbash individuals and even the underground city in which they dwell and the lifestyle they enjoy.
If you are looking for a way to create an unusual human society in your world - or indeed are waiting for Alfeirmur - this makes for a fascinating read.