No role playing game is ever played without some changes to the game system's rules, and Ars Magica is no exception to this rule. Numerous sets of rules changes have been created for the Mystic Halls Campaign under the 3rd Edition rules, and for the Dark Tower and 9th Century Campaigns under the 4th Edition rules. These rules modifications are included here to help explain the campaigns and on the chance that they may help other players of the game.

All of the various separate files of modifications have been combined into a single set of Modifications, Clarifications, and Additions (MCA) for the Ars Magica, 3rd Edition.

Ars Magica (3rd Edition) MCA, V2.2 Download (247K)

The Wizard's Grimoire (3rd Edition) MCA, V1.0 Download (94K)

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The following are old write-ups. Much of the content has been superseded by the MCA V2.0. Many of the pages have not been updated for the new site structure, so some graphics and links may be missing.

3rd Edition

Mystic Halls Campaign

4th Edition

Dark Tower Campaign

9th Century Campaign

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All rules modifications, changes, and additions in this section of the web site, except the 9th Century Campaign Errata and Notes, are copyright © 1996-2009, by David H. Ternes, Fort Wayne, Indiana.