Salve, sodales. I am hoping that I can get some counsel as to the best way for my maga to solve a particularly thorny issue.
My maga, a Bjornaer with a swan heartbeast (and the stereotypical Ignem deficiency) has fallen in love with a magus who has an Ignem form monstrosity: he is ice cold, and at times his environment becomes rather chilly. The feeling is mutual, and they are soon to be all but living together.
However, his being so constantly (literally) frigid is somewhat uncomfortable for her. She wants to make a ring that will keep her warm when she's with him, or at all times for that matter.
Her current character sheet can be found here, if anyone wants to read along. The traits that will be applied to all the enchantments are Int +4 and Magic Theory 5 (her specialty, Regiones, wouldn't apply), she will be working in an Aura of 5, and her laboratory has a General Quality of +1 and a Specialization of +1 in Creo.
Ideally, she would like to create the item in one season as a Lesser Enchantment, although her Magic Theory is sufficient that she could open a gold ring if she had to.
The obvious choice would be CrIg, base 2 ("Heat an object to be warm to the touch), R: Touch (+1), D: Sun (+2), T: Individual, for a final Effect Level of 5. It would be usable twice a day (+1), Environmental Trigger to go off at sunrise and sunset (+3), for a final Enchantment Level of 9. Her LT is Int 4 + MT 5 + Cr 6 + Ig 0 + Aura 5 + Lab 2 = 22, halved for the Deficiency is 11. Problem for her, although this would have the benefit of being basically always on, and offer her protection against practically any cold, whether from him or from nature.
The first thing that I thought of was MuCo, base 2 ("Change someone to give them a minor ability") to give them either immunity or mundane resistance to cold. R: Touch (+1), D: Sun (+2), T: Individual, for a final Effect Level of 5. It would be usable twice a day (+1), Environmental Trigger to go off at sunrise and sunset (+3), for a final Enchantment Level of 9. Her LT is Int 4 + MT 5 + Mu 6 + Co 5 + Aura 5 + Lab 1 = 26, easily doable. In fact, she could increase the duration to Moon (+3) and do away with the Environmental Trigger and make it usable once a day, which would raise the Effect Level and Enchantment Level to 10.
Then I thought of ReAu, base 4 ("Ward someone against a type of normal weather phenomenon"), R: Touch (+1), D: Sun (+2), T: Individual, for a final Effect Level of 15. It would be usable twice a day (+1), Environmental Trigger to go off at sunrise and sunset (+3), for a final Enchantment Level of 19. Her LT is Int 4 + MT 5 + Re 5 + Au 3 + Aura 5 + Lab 1 = 23, which would be right out.
So, what think you, my esteemed colleagues? Would the Muto Corpus effect be the way to go? (And, if so, would/should it have an outwardly visible effect on her?) Or is there another, better way to go about this that I've not seen yet?