Be creative here there are no wrong ideas.
I would like the Spartan laser to be a weapon personally, just called something different "Charge Rifle" was a name I had in mind
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Anyone ever seen Sword Art Online 2? A type of energy sword in this game would be pretty awesome. Sacrificing ranged weapons for a quicker-longer melee? Maybe it could work. Also, I've wanted SMG secondaries since day one. Obv it doesn't fit the Destiny formula (ARs are basically SMG primaries, secondaries are strong concentrated blasts of damage.) but I like it.