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 see a lot of people suggesting grenade launchers, but pls don't = noobtube and there are already way to many was for nubs to score kills. Personally i would like more 'alienweapons' with tons of colors and flashy effects. (necrochasm is halfway there)