A maga wants to explore some caves and doesn't have any kind of torch or lantern that would help illuminate her path. These are pitch black caves, so even eyes of the cat aren't enough for her to see. However, if she could create a little light, eyes of the cat could take over from there. Unfortunately she is terrible at Creo Ignem, so instead of creating light directly, she wants to use her Muto Corpus and Animal abilities to give her a firefly-like bioluminescence.
First question: Can this spell be designed without Creo and ignem requisites? I am hoping it can, and my rationale for believing it can is that fireflies aren't magical, so they should just be animal in form and not need any special elemental requisites. If you turn into a fish, do you need an aquam requisite to breathe water? I don't think so.
I would like to know what the storyguides would say about this.
Second question: If this can be done, would changing the maga in this way be along the lines of "giving a minor ability", resulting in a very low level spell, or would it necessarily be along the lines of "changing a part of her into a land animal", resulting in a much much higher level spell?