Lantern of the Serpent Ward

First of all, I apologize if this post is being placed into the wrong section of the forums, this is my first time posting on here.

Anyway, within the past few days (since the 6.15 patch) my Lantern of the Serpent ward skin has seemed to disappear. I can no longer select it during champion select, and when I try to search for it in the store it won't come up. Any help on this issue would be greatly appreciated, thanks!