Clinical Nurse Specialist

Hello all,
This should be a simple question, so I thought I could get a quick answer in this forum. I'm a nurse in Ohio, diplomma grad, considering going back for my RN to MSN. After reviewing all the options, Clinical Nurse Specialist seems to be an interesting track.
In Ohio, does this require any additional licensure or exam?
I'm not looking to be an NP or have prescriptive rights. I simply want to remain at the bedside and be more of an expert in patient care, also providing a good resource for the other nurses in my area. I'd also be interested in hearing opinions/suggestions for Masters tracks matching my needs as described.
Thank you for any information and very nice to meet you all.