What would you like to see for "Supers"? Would you want Elder-Scrolls-level variation, or something along the lines of as many as five per class?
Would you want the Supers to be something you can find the way you would weaponry and armor, maybe be unlockable at a certain rank or performing a certain task, or would you want every Super available from the beginning only to be able to be leveled up?
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I think it would be best as like 5 per class, and you start with one and either find or unlock the others