Oooh, this is an excellent idea. You can have Auras that interact with each other, Heals that chain together and heal everyone, spells that share damage between party members who each have a certain gem out...
You could have a big spell that takes 3 different gems to cast, but lets party members use each other's gems for it, so you can plan out your spells and wind up big damage together.
There's so many different things you could do with gems that interact with the gems your party members or opponents use. Great idea, hah.
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