[From the back of the book] Everything you want in your game world . . . and more! MasterBook Companion gives you all the "extras" you want and need fro your roleplaying game universe. Spells; equipment; new skills and background options; vehicle combat rules; tips on world creation and cross-genre roleplaying; an index to MasterBook; and a MasterBook/D6 conversion! Whether you're playing in one of the many MasterBook worlds or creating your own, this book is essential to any campaign.