Creating an Adventuring Magus

[ezzelino]

Note an hermetic magus, but a companion (not a mythic companion either) with supernatural powers that might be a possble match for what the OP requested:

Making extremely powerful mundane combatants?

Well, "reliably fighting armies solo" is not mundane stuff in Ars Magica; it's supernatural stuff, and of fairly tall order. But... how about a character like the following? She's a bit of a one-trick pony (she's supernaturally good at swordfights, but that's it); still there's a lot of interesting tactical stuff she can pull-off in a swordfight. She's designed as a standard Companion, with 9 points of Virtues balanced by 9 of Flaws, so there's still room for customization (particularly if you…

Note that Yvonne is focused on swordmanship, but since she has one more point of V/F available, by choosing another Minor Faerie Sympathy you can easily extend her powers into another theme.