A first spell deserves due attention.
3 base effect
- 2 Voice = Lvl 5
- 1 Diameter = 10
+1 Rego = 15.
Well, on the surface, that math works fine. (which is a great start around here, believe me!)
Target "Individual" for Aurum is a special case, one "cloud" in this case (as opposed to being an effect of X dimensions/volume), so that's kosher by me.
The question, then, is whether the effect can yield all those penalites- -3 to attack, defense, awareness, as well as +3 botch dice. (And these are not defined as such by the guidelines.)
The Guidelines say "Create a severe weather phenomenon, (such as) deafening thunder, monsoon rain, impenetrable fog, gale force wind." So, what sort of penalties could those, or one of them, apply?
Imo, any one of those penalties, even more than one, could be caused by one of those weather phenomena, and a combination of weather could certainly cause them all (even more!).
You are essentially partially blinding the target with "smoke". That seems on a par with "impenetrable fog" - I've seen fog where you couldn't see the end of your car hood, and close to losing your hand at the end of an outstretched arm (and heard of same from reliable sources!), so "magical impenetrable fog" works for me to partially blind someone.
But, exactly where the 3 extra botch dice come from is unclear (except perhaps wishful thinking?). However, being "blinded by fog" could certainly create some botch dice for some actions, if not all.
Another question would come from "Does the cloud just around the head justify another magnitude for trickiness?" If the cloud were all around them, there might be penalties for both sides to attack/defend, and certainly to see what the victim was doing, so this is an improvement over that. But, compared to other Magnitude 3 spells, it seems in the ballpark, so I'd not worry about this consideration.
So, if it were me (and these all come down to personal opinion, of which I'm only one), I'd allow it as written, except to rule that only "relevant" actions would receive the botch penalty, but not all- anything that depends on clear vision/etc, so Running, Awareness, some (but not all) Athletics, Missile Fire, Spell Targeting (but not casting!), etc etc. And I'd add that it'd be equally difficult (if not more so?) to clearly see the victim's head/face/shoulders while this spell was functioning.
Nice little spell. (Bonus point for the word "caul".)