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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I would love to see melee weapons make an entrance. There are hints of the system in place, and I'm sure balancing would be a nightmare, but I would like to have the option of my "oh sh1t" moments resulting in some intense visceral combat.