>Where do i get this from?
It was part of a limited time fundraiser event during the start of the COVID pandemic.
https://www.leagueoflegends.com/en-us/news/dev/covid-19-charity-fundraiser-details/
here you go: https://www.leagueoflegends.com/en-us/news/game-updates/prestige-through-end-of-2021/
“Because of the latest time shift, we still can't share a full rundown of the rare and exclusive content update, but we've been eager to tell you something. So, here are a few tidbits: The proper name of the update is the "Mythic Content Overhaul" based on the Mythic tier of skins. We know Gemstones and Hextech skins need some modernization, so we'll be transitioning Gemstones to a new rare (Mythic-themed) currency and releasing more exclusive content for it. The new system will include a way to, over a long period of time, unlock a Prestige skin without spending any money. Fingers crossed this is our last delay, but just to be safe... everything here is subject to change, pending further unplanned shifts. Thanks”
I use Outplayed. Search it up and download it. After a game, you'll get kill, death and assist cams. Then you can look for the folder in file explorer.(it's called game summary)
Here's the link: https://www.overwolf.com/app/overwolf-outplayed
(you also got to download Overwolf because that's the launcher.)