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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A Bow as a secondary weapon. It would have a pullback charge that effected damage and range. And different abilities like exploIve arrows, Markers after impact, leaves a tripmine grenade where it was left, ect. To make it less op they should decrease ammo to less than 10 and a longer charge