The campaign is not very restrictive about races. You are free to use any race from the following without discussion:
- Players handbook 1 & 2
- Manual of the Planes
For any other race just contact the DM with some background on the character idea.
In addition there are two races that I’ve specifically added:
- Demigod : Contact me for information related to this race.
- Revenent : Dragon 376
- Genasi : Forgotten Realms Players Guide