Teased a few months ago, the Eternals system went through ups and downs. The League of Legends community harshly criticized its initial form and Riot Games went back to the drawing board. However, it seems they finally reached a point where they're satisfied by the mechanic.
Whether it's a sick play, a mad juke or even a long-range kill with Ezreal, Lux or Jinx, the Eternals system will allow you to track and celebrate specific stats for each champion.
For now, each champion has two Eternals sets, and Riot is already planning to add more of them.
Unlockable thanks to Blue Essence, the "Starter Series" will contain milestones that can be achieved with any champion. The second set will be dedicated to each champion, tracking unique stats that are specific to their respective designs, and will be purchasable thanks to RP.
Wondering how many times did you manage to pull off a sick InSec kick with Lee Sin? The Eternals unique series will track this number, also allowing you to mark milestones in your progress.
After completing five milestones of a given Eternal, you'll unlock your per-game Personal Best associated with each tracked stat. After 15, your Mastery Emote will be upgraded to display your achievement.
Each time you're reaching a milestone, you'll receive an in-game notification. You'll also be able to check your progress into the new "Progression" tab.
Currently being tested on the PBE, the Eternals system is planned to be released alongside Patch 10.5.