I am posting this because the Bestiary has an unexistant monster named Tiamet. As I already posted in the monster forum, the dragon that appears in the Boneyard Gully it's Tiamat.
http://img128.echo.cx/my.php?image=tiamatcs6zv.gif
http://img289.echo.cx/my.php?image=tiamatcsbg3aa.gif