Whilst googling around for Ars Magica material I came across the RPG Stack Exchange pages, and an interesting question was asked – Does Wings of Soaring Wind need to penetrate the caster’s Parma?
Go over an have a read; the short answer is yes. There is no elegant work around that I can think of except the group of players agreeing to hand wave the issue due to how cool the spell is. That said, some left field options and discussion carries on below.
The reason is that the spell creates a magical construct which should really be resisted by their own Parma Magica. Just like if a different Creo Auram spell created a forceful enough gust to blow a fellow magus backward, the Wings of Soaring Wind (WoSW) spell should always be resisted as it is not Range:Personal. Be aware too though most troupes choose to hand-wave this complexity of Parma Magica away as a complication which does not add significant value to the story. The same could technically be said for spells which create air for the caster to breath, and many other scenarios.
I can think of two very awkward work-arounds which still let the cater use Wings of Soaring Wind in some manner.
Firstly by creating a large parachute or wing, which is then blown about by the spell.
I know it’s a horrid consideration for the spell to be effective, but a wing will extend outside the caster’s parma and therefore could be pushed around by the spell as written. That wing could be a fixed construct, a magically created construct, or even another item transformed into a wing – just as long as it is not a physical extension of the caster themselves, as that would also resist the magic (so no Muto Corpus wings). A Muto Herbam spell which transforms the caster’s cloak into a sail will do the trick.
Secondly the caster might develop a Muto Vim based sabot spell to increase penetration to themselves. The idea is that the caster can construct a shell around their own effects which is specifically designed to penetrate their own Parma better than other spells.
The approach is very non-conventional, and likely will need the player’s troupe to agree that an approach is even possible. It has been argued before in the Ars Magica forums that some effects which would benefit from increased personal penetration should use a Muto Vim spell like this, but exactly how the spell works is contentious.
E.g. Why can a caster design a sabot spell for themselves and not another specific enemy? It’s a potentially slippery slope.
A good odd initial question that demonstrates some of the questionable aspects of Parma in Ars Magica, and how the best games will hopefully hand-wave them.