filter.
It might be like that. There are wands involved in Charter Magic, sometimes. I haven't ever mixed a potion.
I know how to make shield charms, but they aren't as strong as the kind made for battle magic. And I don't know how to turn myself invisible. This isn't the best place to experiment, but I'd be curious to know if there were a way to do it.
Could I see what you can do, so that it doesn't take me by surprise if it happens out in the woods?