To dertermine which is the rq in the 5th it works with the base level of effect. Which ever is less becomes the rq. I personally think that a magus is limited thru his arts for the number of vis he can use hense, I would says that a rq also limits the amount of vis one can use. Let me detail: MuCo(An) : Ian has 10 / 10 / 5 in corresponding arts. He can use 10 Muto vis 10 Corpus & 5 An typically but since this spell has a rq, he can only use up to 10 Muto & a combination of up to 5 Co or An vis. In our campain, MuCo vis does not exist ( or is spliced at collection ) so this is not an issue for the limit.
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