The Lore Role-Playing Game System was originally built for this Rational Magic setting.
It should give you a fast and meaningful role-playing experience which also ties a character’s story and development into the game world. It was developed by looking at some of the best (in this author’s opinion anyway) features of such games as FATE, GUMSHOE, Barbarians of Lemuria, and Microlite20.
The Lore System dice mechanic and system basics are relatively simple (2d10 to beat a target number). Characters are mechanically described with just a few attributes, a few special powers, and one or two descriptive Professions. This game promotes the Game Master to make rulings, instead of just following rules.
Although this is essentially a traditional type of RPG, an important difference between Lore System and many other RPGs is that there is relatively little emphasis on “leveling up”. Instead, this game system uses a feature called “Lore Sheets” which defines the character’s progress in the game world, granting mechanical power to relationships the character has cultivated and might serve as a running log of the character’s accomplishments.
Lore 100 System
The Lore 100 System uses the unique elements of the Lore System and marries it to a traditional d100 system. It is built to combine the investigative abilities of systems like GUMSHOE with the gritty combat of Mongoose Legends, all tied to the setting and character backgrounds with Lore Sheets. This is being developed for use with genre-bending sci-f- and fantasy genres.