[It's not level 2; it's base 1 + 1 concentration (and I had originally been assuming you'd go for sun to avoid concentration rolls, and then PeVi it later) + 1 Touch = 3 (or 4 as had been my original assumption, which would have required a casting total of 20 for a non fatiguing spell, which is right on the boundaries of the aura mattering). Also, Divine auras subtract 3 per level, not 1, so a divine aura of 10 would be a -30 penalty, which Viola certainly can't manage. Not that it is a divine aura of 10, but, details.
Rereading your character sheet, I'm also not sure why you're not just using Image Phantom, rather than sponting weaker equivalents? Is it that you want the concentration duration, or just that you'd forgotten she had it? I'll let you substitute in using it, if you want to, since Viola shouldn't forget the spells she has IC.
I'll note that Viola seems to be making massively less use of her Life-linked Spontaneous Magic than I tend to expect her to - when I'd been originally considering how she'd get into the covenant, I'd been assuming she'd just spont Veil of Invisibility on him, and have done. Yes, it's three fatigue levels down, which means a three-quarter of an hour recovery period, but that's less time than she spent lurking outside the alehouse, and probably less likely to go wrong.
Basically, in non-time-pressured situations my perception is that Life Linked Spontaneous Magic is a way to get round pretty much any obstacle that can be dealt with with a 4th magnitude spell (and Viola can get at least one more magnitude on that for pretty much any art combination if she's willing to risk the consequence of a botch).]
Viola gives some instructions to Theodoric, then turns herself back into the butterfly and perches on Niko's shoulder. Niko then turns himself invisible. The sight of two butterflies perched on an invisible shoulder is odd, but unlikely to be noticed by anyone in the dark. As they travel towards the fortress, Viola suddenly realises that she can see Niko with her Second Sight where she couldn't before. A couple of hundred metres from the fortress, Theodoric stops, and Viola flutters over and casts her spell, fatiguing herself in the process. It works, as far as she can tell, and Theodoric looks like her (hastily glimpsed) memory of the soldier. She realises she has no idea what his voice sounds like, however.
As Theodoric approaches the gate, he's hailed from above in Greek (Theodoric can understand it, but Viola can't).
"Hey! Theo! You're back early! What happened with the fight? I had three silver pennies with Phokas on Aeolus doing for Silas' red bird.
In a somewhat reassuring display of lax security, the gate is already beginning to open.