Treasure of the Black Dragon
Players are allowed to use anything from the following books. Classes, Feats, and Magic Items are all welcome.
The Players Handbook 3.5
The Dungeon Masters Guide 3.5
The Monster Manual 3.5
The Dungeon Master may incorporate parts of other books into the game. If something is introduced then the players are allowed to make use of it. The world is a large place and many things exist, however they may not be very common. Players can expect to be able to find anything in the core rule books without much difficulty. However while items exist from the other books they are difficult to find.