Ars Magica is a great game system - one of the best commercially available role-playing games ever created. It is not perfect, however.  This section addresses some of that imperfection by listing saga rules: special rules or rule modifications used in the Bohemian Rhapsody Saga. These include changes to general game rules; specific virtue and flaw interpretations used in the saga; special rules for handling long-term events, and last but not least, a host of special rules for handling magic in the saga.

In addition to the those rules changes, some published spells require correction to remain congruent with the published guidelines.

Design notes are original spells and enchantments that were developed by characters in the saga. In addition, the notes include certain discoveries resulting from original research in the saga, by player characters or non-player characters.