Muto Corpus guidelines seem incredibly sparse

I was thinking formulaic spell, just like Cloak of Mist, that doesn't change you into an air elemental :wink:

If going ritual, adding requisites, piling on magnitudes... Sure, but we're talking of a different beast :smiley:

Agreed.

The Mysteries: Revised edition (page 44) says that "Hermetic theory does not in itself [outside the context of the Mystery virtue being described] possess the ability to grant Magic Might to a human", so it would need to be a house rule.

By the Medieval Paradigm arn't insubstantial spirits made of magical vapors or the like. Hence the whole Airy Spirit classification and also why the whole turning into an insubstantial form with MuCo requires a Auram Req.

I think than Vim maybe not, but Mentem probably; that Form still bieng one of the most "ethereal" to work.