Please make a weapon with all three elements.
Make it able to shoot a uni beam and be able to shoot any element of choice.
It would be more of a key..
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perhaps even a weapon that is able to use all three damage types, but these would be added via weapon upgrade path. one damage type used at any given time, but is switchable say holding ADS and choosing damage type with d-pad. this would be some spectacular weapon for sure, and should not be too easy to come across.