Edit: I forgot to write on console...oops. She could use a buff on console. Using widow on console feels like spitting gravel against a dude with a super high tech gun.
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Just maybe her grappling hook. Any buffs to dmg would probably make her a bit op. My friend is godly with her and I'd hate to see him get a buff. The mine is fine as is, it's a perfect way to alert you if something is flanking, and can easily get you a snipe on someone who thinks they will have thr drop on you.