[Gameplay] Zeke's Harbinger

Upon completing a match on Aram, I decided to look at the graphs. As I looked at the critical hit graph, I noticed that I (playing Soraka) had a crit. I did not have anything crit related in my build, runes, or masteries. Upon further analysis, the crit seemed to come from Zeke's Harbinger, an item that's supposed to release in patch 5.14, according to the wiki. I do not have any memory of buying said item, nor have I seen it before. It didn't show in my inventory during the game either.

Although I had no idea that I was in possession of that item's stats, I do believe that it gave me an unfair advantage, no matter how small it may have been.

The link above shows the item order, the runes, and masteries I used in that game.

Credit to Shedao Shai PUNI for revealing the cause.