Isen listens carefully to Viscaria
Well, being able to recognize the arts used is not necessary, since you must announce the arts you'll use. He just needs to remember that the man said "Creo". Or course, being able to understand everything that's said would be better, if only because the information dropped casually by people around may be useful, or to know the cause of the certamen. Likewise, being able to write things up instead of having to remember them is better, but, on the other hand, if he writes things up, he'll be noticed.
So, ideally, we need a group of people, who speak latin, who'll rotate, hear things up, and then either go write it, or dictate it to a scribe. At worst, we could hire a few people to do this.
Isen acquiesces.
Very good idea. We can't rely on magic for everything, and having our covenfolk be able to fend as much as possible by themselves may prove quite important.
Isen thinks for a moment...
If I do this with Watching Ward, it'll be very efficient, but costly in Vis. 8 pawns per ward. So I'd prefer limiting it.
I can probably find a way to lay some traps by using Rego Vim and my Talisman, but this'd require me to activate them, and to concentrate at each sunrise and sunset if we don't want them to be activated by the flickering that these causes in enchantments. This may be too risky.
Taking his chin in his hand, thinking, then
Invisible foes is another problem. Being of an effective 7th magnitude, our Aegis should be able to keep most of them out. Problem is, nothing stops a magus from just entering our aegis and casting it. Although they will be severely impeded, they'll still benefit from our Aura. I wouldn't be able to do it, but... Say, if a magus is able to cast 4th to 5th magnitude Perdo Imaginem spells, he may be able to do so, at the expense of his personal energies.
So this is not easy, but I wouldn't consider us to be secure on this front either. Especially as he can do the same thing with an item.
Truth be told, this tribunal is a huge security risk, and we can only minimize them. Having our covenfolk be as knowledgeable about what to expect and what to look for may help, but, although I think we can probably rule out an attack, we can probably expect an intrusion.
To that end, should you all agree, I think we should cooperate to put a Watching Ward in each of our sanctum, as well as in the library. The vis cost will be high, but it's worth it, in my opinion.