User blog comment:Tatmtn/Character Appreciation: Ruby/@comment-3257939-20141222051652/@comment-73.42.187.52-20141222053921

^as Mercury said, she isn't untouchable, but you are only going to get a solid direct hit once with any metal object, if you have the skill to hit her in the first place... because after that first hit(which she usually gives you a close range hit to something like her shield/arm) she can use her semblance to make sure your others only look close.