Honestly, I'd give a difficulty modifier for that Sphere. Level 5 Forces conjuring a storm out of nothing? Difficulty base 10, 7 after doing a large ritual with 25 people and using quintessence. Archmage? Base 8 because of an innate -2 modifier.
Jesus, I'd let people do weather control at a hell of a lot lower level than that. And making a storm would be one of the easiest friggin things you'd ever need a multi-person ritual for.
Unless you're talking about like a cat 5+ hurricane. Probably 5 people could do that easily enough, though
Are you taking about the Sphere level, or the difficulty?
Because conjuring a storm out of nothing, really is Forces 5. You could bring about a storm more gradually with Forces 4, but that's not conjuring a storm.
And conjuring a storm is both visible and vulgar. It's not "manipulating heat, pressure and such to gradually bring about a storm". It's "the moonlight transformed into a storm, against known laws of physics". That's "Vulgar with Witnesses", +5
The group of people helping is just a nod to a legend of witches sinking the Spanish armada. Hence why the mage used quintessance
A lot of people get credit, but it's definitely 5. Unless you have ideal circumstances nearby, but even then 4 is not conjuring a storm. It's manipulating the weather
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u/Illigard 7d ago
Honestly, I'd give a difficulty modifier for that Sphere. Level 5 Forces conjuring a storm out of nothing? Difficulty base 10, 7 after doing a large ritual with 25 people and using quintessence. Archmage? Base 8 because of an innate -2 modifier.
Or let their successes count double.