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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Make a weapon type for each class. Hunter- ballistic knives that are also throwable and picked back up Titan- can pick up items on map and throw them. More like an ability but watever Warlock- magic staff that lets you constantly use new types of spells. And is also sharp on the ends for close combat