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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Pistols and smg secondaries. Pretty much discount auto and hand cannons but can be used on sparrows, drive by sparrow. And an elemental thrower for heavy. Shooting while aiming makes a refined line of damage while hip fire makes a spread out flame/arc/void