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 with a low rate of fire very high impact and range, good accuracy the stability could start high but the longer you have it drawn back the more unstable it is but the power increases. And it's only perk is it bypasses any shield. No other perks to make it op. Just negates any shield. No elemental damage either.