Northern Storm Volibear

Hi. First time posting on the forum. I am unclear of the meaning of a skin going into the legacy vault. I have recently rejoined the lol community and really taken a liking to Volibear, I am even more excited for his up coming rework. however there is a skin that i would really like to try and get my hands on. Northern Storm Volibear. I don't want to get my hopes up but i wanted to know if the skin could still be gotten through the chest system friend gifting, or re rolling. I appreciate any help people can give me.
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