I'm against just anybody being able to whip out the knife and start instagibbing people, but I'd be for some sort of cloaking application. But make it so that when they get the kill they can't fully cloak for x amount of time, or they can only deliver one such kill for x amount of time. Make it useful for a sneaky cloaker who catches somebody doing something stupid, but not a way to clear out an entire hallway from behind.
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