League of Legends has put into place a new system in which players can receive rewards. These are called Hextech Chests. Each chest contains stuff like champion shards, skin shards, summoner icons and/or essences.
Getting chests can be done in two ways with one being a bit harder than the other. The first way is through getting an S rank on a champion. This can only be done with champions you own and if you do it with a free champion or a rented one then you won’t receive a chest. If your premade partner gets S rank with a champion they don’t own, they won’t get a chest but you can if you own yours. You can only get four chests through wins each week and the limit will reset once the week is over, but if you get a chest with a specific champion then you can no longer do it with that champion until the season resets.
The other way you can get chests is to buy them from the League of Legends client store. One chest will cost 125 Riot Points but has bundles ranging from almost 200 RP to nearly 2,000 RP. You can buy up to 25 chests a day and this will not be counted towards your weekly limit. It should be noted that you have the chance of getting the same content in chests because it is random and you cannot get a chest if you leave a match early. Also if you have been punished recently then that will also affect if you receive any chests.