Figured I'd do a bit of public brainstorming
- Archdemons/Prime Evils
- Angels with mysterious agendas
- Many races of fiends swarming over the world
- Soul-trapping gems
- Magical gems in general
- Magic item crafting
- The Church of Light
- Corrupted jungle temples
- Desert tombs
- Towns built on the borders of great evil wastelands
- Cathedrals
- A distinct sense of East and West
- Clans (of mixed races)
- Steppe nomads
- Warbands
- Desert fortresses
- Jungle palaces
- Tundra encampments
- Mountain monasteries
- Rakshasas
- Ancient dragon bones
- Poison
- Martial arts