Piercing chance

I am trying to turn my skullshield blasts into an aoe skill. I read in the dictionary that there is an affix that can do this called “piercing chance” how do I get this and is there an easier and more reliable way to do what I want

Piercing chance is best gained on hero points for specific skills. There is a mythstone called zenith which has pierce chance but I don’t think it works but I wonder if it works now in patch 2.2 .

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Would getting the mythic affix Arc do what I want, or would that only give the MH the proc?

Edit: after conducting a rather expensive experiment, the answer is no. Arc is a on attack chance not an on hit chance. It would be nice if the the description read as such.