Re: [Magic] RPM, Paths, Realms - So many variants, but which one to choose?
How about Effect Shaping with a effective skill bonus the caster wants to risk?
Threshold or Corruption could be used when a caster wants to risk a fast or more powerful casting. I would limit the bonus to some multiple of magery, depending on how powerful or corrupting you want it to be.
Things like Ley Lines. Grimoires, Place of Power all work well here as they can grant a bonus without Corruption.
Your magic storms could grant an extra bonus (Might not even be an option to choose) for those casting during a storm. Get more powerful spells from a higher bonus but coupled with extra corruption. That would work best with Margin Based casting.
I have noodled something like that for a Wild Magic variant.
Also take a look at Spirit Mediated magic since you have Thaumatology.
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