I have written another RPG product, and this is also a short supplement for Ars Magica, under the Open Licence. As you might guess from the title, it is about learning mundane Virtues.
The Ars Magica rule system includes Virtues and Flaws. Virtues are strengths that the character has that are not represented by the basic game statistics. (Flaws are not just weaknesses, but that doesn’t matter here.) The original rules, way back in the 80s, did not have any way to acquire Virtues during play, but over time the game has acquired quite a few. There is Mystery Initiation for Supernatural Virtues, for example.
There are no rules for acquiring the completely mundane Virtues.
For some, this is fine. Large, for example, makes you taller than normal, and, assuming you are an adult, there is no mundane way to acquire that. Others are just representations of having been trained in skills before beginning play, and so are already covered by the rules. But there is a subset that looks learnable, but for which there were no rules.
In the past, we have tried to work around that by using the Initiation rules, but they are not really appropriate. The rules in this supplement are based on the Initiation rules, but without the parts that really don’t fit for mundane Virtues. There’s also a list of the Virtues I think can and can’t be learned using this ruleset.
The supplement is available on DriveThruRPG and Patreon.