The drop down box to the left in the Boosts section of Accessories in the Store still displays Influence Points, despite being replaced by Blue Essence in V7.22 - patch released November 8th 2017, two years ago.
No discredit to Riot. It's not a bad thing that it's still there. It surely won't cause any bugs or anything, and they do have more important things to be doing. I just wonder if this is the last mention of IP that we will ever see in the League client.
- Client as of 5th November 2019
