In the main 5thEd book, "Whispering Winds" InAu15, apparently fits poorly into Hermetic Theory.
So I was wondering on opinions as to whether it was possible to make a version of the spell that permitted bi-directional transmission of sound?
So that a mage could cast a spell to talk with somebody they could see, even if the target person was on the other side of the valley.
I think the conventional way to achieve that is to use two spells. Each spell can either push or pull, i.e. either receive (Intellego) or send (Creo).
Doing two-way push would mean affecting two targets at once, which is somewhere between too hard to bother and impossible without a break-through. The group target is not applicable when the two people in the group are miles appart.
Two-way pull is even harder, because pure Intellego can only grant senses to an individual. To affect a group, it is Mentem and a bunch of requisites.
Combined push and pull from one side would also require requisites, at least Creo with Intellego or vice versa, to the point that two spells is going to be easier in every respect.
That said, you can do it.
When it comes to the non-Hermeticity of Whispering Winds, I think the point is that in Hermetic Theory it should be an Imaginem effect. When you can do it with an Auram effect, it is singular legacy effect which cannot be varied without a breakthrough.
Since the NPC is an Aurum specialist, I have decided that he has created a Rego Aurum spell "Whispers on the Breeze" that is Sight Range, Concentration Duration that carries his words (or any other noises he makes) to someone in sight.
I think that should be equivalent to controlling a minor weather phenomenon - so Base 2. But with a Finesse roll required.
Won't work if it has to go through a stronger weather phenomena.
Momentary . I was stretching to two or three seconds, so as many as four or five words when spoken quickly. That seems enough for communication, albeit with difficulty. I was shooting for the lowest level possible.
But while we are at this. Last time we had a need for AC range communication, we used Creo Mentem, which only some of the magi had the arts to penetrate with.
Can you extend your CrIm proposal to AC range? It would then be L10 for momentar. WOuld it still be unresisted? Or would the fact that the species have to travel through the AC all the way to the receiver make them magical?
If it specifically targets a magus it is going to be resisted. If it targets an AC that the magus has sitting on a table in front of him it won't be. But that second option takes either timing or some contraption to keep the AC within hearing distance, (aka. a grog).
The spell creates an image ( or whatever the correct term for an audible image is) which, in turn, generates non- magical species.
So to Tellus' point a magical fire generates magical heat while a magical image generates non magical species. Yup that's sort of inconsistent. It's a game mechanical kludge so magi can see illusions while they're protected by their parmas.