Reconstructing Ars Magica: the basics
This post gives new magic rules inspired by Ars Magica. It's written for my own fantasy heartbreaker, but it should be compatible with most or all OSR games. Try using this in place of your Magic-User's normal magic rules, or add these as variant casting and spell-learning rules for a different casting class. These rules offer supreme flexibility and extensibility for a sort of magic grounded in magical traditions. I provide links to the traditions at the bottom of the post. These rules also model spell research, including the creation of brand new spells, better than any I have seen in any OSR game. What a spell is A spell is a combination of a noun and verb, spoken out loud, plus some gestures and effort. Your specific magical tradition is going to give you the specific list of nouns and verbs that can combine to form a spell. The same noun-verb combination can be used to cast a bunch of different spells; the noun and the verb just give the basic family of effects. For instan...