So as of session 50?, the uber-mage in my game has made his way to a G8 Sorcery. He started at B5, and through clever applications of casting quickly, and the addition of facets, gamed his way to a B8. A few Aristeas later (at dramatically appropriate moments) and some miscellaneous Artha expenditures, and BAM! G8
Now, fortunately, I can still hit him the old-fashioned way: arrows, crossbows, fast guys who close to the inside, and hordes of mooks that he can’t destroy fast enough, and the classic “It’s illegal to cast that magic in the city.” That’s all good and well.
Eldritch Sink is an option that I will be pursuing soon, by way of an ancient guardians awakened by the gods to teach wayward sorcerers a lesson. Maybe something like a B’hema, with Eldritch Sink.
Up until now, I’ve been using a made-up trait that I’m calling Resistant to Magic. It’s like Resistant to Fire, except it applies to all Sorcery. So, black-shade magic doesn’t affect the creature. Gray-shade magic has its effect reduced by a margin equal to the creature’s Forte. White-shade magic is unaffected.
I think that’s a neat, somewhat mellowed version of Eldritch Sink. I’m not a huge fan of challenging by simple negation - I think it’d get old after a while.
So I’m looking for innovative ways that people have challenged very powerful sorcerers in their games - unique situations and stories of things that presented good obstacles.
Until he shade-shifts his Will, he won’t be able to just level things willy-nilly. Once he does, I think my capacity to reasonably challenge him will force the character into somewhat ridiculous situations that the rest of the party won’t be able to handle.