The only exotic sidearm was dregs promise, which was crap and a year one exotic. I think bungie should make a few exotic side arms that are worth using.
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It would be really cool to have a set of dual-wielded sidearms that each do different damage types. For example, the left hand pistol shoots arc damage while the right hand pistol does solar. It would be a unique and creative way to make an exciting exotic sidearm