Symbols, portraits, writing and images falls under the major supernatural virtue Craft Magic, which is used by the Rustic Magi in House Ex Miscellanea. By RAW, the rest of the Order cannot use these things normally when crafting items. But like many other things, if you with it in your saga, then go for it.
My only argument against this is the whole issue of "potent magic," which also uses the S/M table. According to that, you can theoretically make dagger-shaped Raspberry Tarts of Virulent Poison and still get the +3 "Poisoning" bonus for the dagger-shape of the foul pastry.
Are the rules concerning use of S/M different for potent magic than they are for enchanting? I know that the number of S/M "objects" you can gain a S/M bonus from is limited to your Magic Theory.
I don't have my Mysteries book with me, but according to an example in there, a small "hearth-shaped" token works just as well as the gigantic one you may have in your home.
Crosses are "symbols," and if something as abstract as a "Thunderbolt" isn't a symbol of some sort, then I'd love to know what this S/M bonus really is.
If I'm completely missing the concept of the S/M bonus, please give me a page reference and correct me, as I'd love to know if I've been doing something stupid for the past couple of years!
If this IS the case, I'd suspect using "Symbology" in your enchanting would be a major breakthrough (and thus, virtue) of some sort not stackable with Verditius runes.
I consider myself pretty conservative, as well, but according to you I don't seem to be getting the S/M concept.
I'd love to correct this if I am doing it wrong. Got a specific page reference?
Interesting. HoH: Societates is the only Ars book I don't have save for RoP: Faerie.