"Meet me on the top floor of the mansion, ten minutes after sunrise tomorrow," Tranquillina instructs. "I shall perform the ceremonies then; they should not take longer than twenty minutes or so."
((Wilhelm might well want to do things between now and then, but let me do Tranquillina's part now while I've got the time ))
Tranquillina is up a little before sunrise, as usual. After she invokes her Parma Magica and selects an appropriately ceremonial Hermetic outfit, she meets Wilhelm in the mansion and takes him across into the regio side. A quick walk down the hall brings them to the ceremonial casting room, which she surveys for a minute, forming a plan. She begins with a ceremonial version of Touch of the Faerie Presence, then follows up with a version of Sight of the True Form, making a big production of both spells with strongly voiced intonations.
((Touch of the Faerie Presence: grant a magical sense of touch to detect faeries. I don't know what the base level should be, so we'll roll up for that. Range: Touch, Duration: Sun, Target: Touch (sense). Sta -3 + In 6 + Vi 7 + aura 5 + Artes Liberales 1 + ceremonial room 5 + words/gestures 2 + stress die 4 = 27, halved is 14. That's enough for a Base Level 2 spell, which means ... I don't know. Hmm, if a Base Level 3 spell would be significantly better, she'll spend a Confidence Point to increase the Casting Total to 15. Let me know though.))
((Sight of the True Form: rolling up for level of effect, Range: Touch, Duration: Sun, Target still Vision. Sta -3 + In 6 + Co 28 + aura 5 + Talisman attunement (eyes) 6 + AL 1 + room 5 + words/gestures 2 + stress die 2 = 52, halved is 26, which is like a level 11 SotTF after the increased Range/Duration are taken into account. That's good enough to see through mundane disguises and spells/effects of level 11 or less.))
After ten minutes or so, Tranquillina ceases her gesticulations and regards Wilhelm, who had to choke back a bit of bile in his throat a couple of times. "Remember, neither spell is infallible, against a powerful enough adversary. But I hope these provide you with some measure of confidence. Your enhanced senses will last at least until sunset, but probably a couple of days." ((In fact, Touch of the Faerie Presence will last two days and one night, while Sight of the True Form will last five days and four nights.))