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 >>/8352/
Also, Discord is, as Sunny points out, something of an unreliable narrator.

 >>/8350/
> All and all, I am mixed to negative on the lore that was established here. 

TBH I think the correct solution IS to destroy the crystals; they're containers not an actual source.
Based on the tale given here, breaking all the containers should return magic as a whole to the world. Which means if the tribes want to retreat again there's no downside BUT neither can any malign actor hold magic hostage.